Staff directory

Pedro Gómez Romero

CSIC Research Professor and Group Leader
Novel Energy-Oriented Materials



  • Asymmetric Supercapacitors Based on Reduced Graphene Oxide with Different Polyoxometalates as Positive and Negative Electrodes

    Dubal D.P., Chodankar N.R., Vinu A., Kim D.-H., Gomez-Romero P. ChemSusChem; 10 (13): 2742 - 2750. 2017. 10.1002/cssc.201700792.

    Nanofabrication using a “bottom-up” approach of hybrid electrode materials into a well-defined architecture is essential for next-generation miniaturized energy storage devices. This paper describes the design and fabrication of reduced graphene oxide (rGO)/polyoxometalate (POM)-based hybrid electrode materials and their successful exploitation for asymmetric supercapacitors. First, redox active nanoclusters of POMs [phosphomolybdic acid (PMo12) and phosphotungstic acid (PW12)] were uniformly decorated on the surface of rGO nanosheets to take full advantage of both charge-storing mechanisms (faradaic from POMs and electric double layer from rGO). The as-synthesized rGO-PMo12 and rGO-PW12 hybrid electrodes exhibited impressive electrochemical performances with specific capacitances of 299 (269 mF cm−2) and 370 F g−1 (369 mF cm−2) in 1 m H2SO4 as electrolyte at 5 mA cm−2. An asymmetric supercapacitor was then fabricated using rGO-PMo12 as the positive and rGO-PW12 as the negative electrode. This rGO-PMo12∥rGO-PW12 asymmetric cell could be successfully cycled in a wide voltage window up to 1.6 V and hence exhibited an excellent energy density of 39 Wh kg−1 (1.3 mWh cm−3) at a power density of 658 W kg−1 (23 mW cm−3). © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

  • Capacitive vs Faradaic Energy Storage in a Hybrid Cell with LiFePO4/RGO Positive Electrode and Nanocarbon Negative Electrode

    Cabán-Huertas Z., Dubal D.P., Ayyad O., Gómez-Romero P. Journal of the Electrochemical Society; 164 (1): A6140 - A6146. 2017. 10.1149/2.0211701jes.

    We report an advanced device based on a Nitrogen-doped Carbon Nanopipes (N-CNP) negative electrode and a lithium iron phosphate (LiFePO4) positive electrode. We carefully balanced the cell composition (charge balance) and suppressed the initial irreversible capacity of the anode in the round of few cycles.We demonstrated an optimal performance in terms of specific capacity 170 mAh/g of LiFePO4 with energy density of about 203 Wh kg-1 and a stable operation for over 100 charge-discharge cycles. The components of this device (combining capacitive and faradaic electrodes) are low cost and easily scalable. This device has a performance comparable to those offered by the present technology of LIBs with the potential for faster charging; hence, we believe that the results disclosed in this work may open up new opportunities for energy storage devices. © The Author(s) 2016. Published by ECS.

  • Direct electrodeposition of imidazole modified poly(pyrrole) copolymers: synthesis, characterization and supercapacitive properties

    Wolfart F., Hryniewicz B.M., Marchesi L.F., Orth E.S., Dubal D.P., Gómez-Romero P., Vidotti M. Electrochimica Acta; 243: 260 - 269. 2017. 10.1016/j.electacta.2017.05.082.

    In this manuscript we report the direct electrosynthesis of a new conducting copolymer based on the incorporation of imidazole molecules within the polypyrrole chain. Different proportions of the monomers were tested during the direct electropolymerization of the copolymer. The resulting materials were characterized by electrochemical and spectroscopic techniques (Raman and XPS) and a mechanism of polymerization is proposed. Our findings showed that imidazole acts as an inhibitor of the polymerization process, decreasing the overall number of actives sites for the polymerization on the electrode surface producing a polymeric morphology very different compared with pure polypyrrole, as observed by Scanning Electron Microscopy images and corroborated by Electrochemical Impedance Spectroscopy. This behavior significantly affects the supercapacitive performance of the resulting p(Py-IMZ) modified electrodes where the specific capacitance of the material increased from 122 to 201 Fg−1 (64%) at 10 mV s−1. Furthermore, a unique pseudo-capacitive behavior described herein emphasizes the role of the imidazole as inductor of the morphology and co-monomer in the unique electrochemical signature of the material. The results suggest that the incorporation of IMZ increases the specific capacitance of PPy electrode by around 64%. © 2017 Elsevier Ltd

  • Functionalization of Polypyrrole Nanopipes with Redox-Active Polyoxometalates for High Energy Density Supercapacitors

    Dubal D.P., Ballesteros B., Mohite A.A., Gómez-Romero P. ChemSusChem; 10 (4): 731 - 737. 2017. 10.1002/cssc.201601610.

    Hybrid materials are very attractive for the fabrication of high-performance supercapacitors. Here, we have explored organic–inorganic hybrid materials based on open-end porous 1 D polypyrrole nanopipes (PPy-NPipes) and heteropolyoxometalates (phosphotungstate ([PW12O40]3−, PW12) or phosphomolybdate ([PMo12O40]3−, PMo12)) that display excellent areal capacitances. Two different hybrid materials (PMo12@PPy and PW12@PPy) were effectively synthesized and used for symmetric supercapacitors. The anchoring of the inorganic nanoclusters onto the conducting polymer nanopipes led to electrodes that stood up to our best expectations exhibiting outstanding areal capacitances that are almost 1.5 to 2 fold higher than that of pristine PPy-NPipes. In addition, symmetric cells based on PMo12@PPy and PW12@PPy hybrid electrodes were fabricated and showed significant improvement in cell performance with very high volumetric capacitances in the range of 6.3–6.8 F cm−3(considering the volume of whole device). Indeed, they provide extended potential windows in acidic electrolytes (up to 1.5 V) which led to ultrahigh energy densities of 1.5 and 2.2 mWh cm−3for PMo12@PPy and PW12@PPy cells, respectively. Thus, these unique organic-inorganic hybrid symmetric cells displayed extraordinary electrochemical performances far exceeding those of more complex asymmetric systems. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

  • Hurdles to organic quinone flow cells. Electrode passivation by quinone reduction in acetonitrile Li electrolytes

    Rueda-García D., Dubal D.P., Hugenin F., Gómez-Romero P. Journal of Power Sources; 350: 9 - 17. 2017. 10.1016/j.jpowsour.2017.03.048.

    The uses of quinones in Redox Flow Batteries (RFBs) has been mainly circumscribed to aqueous solutions (of derivatives with polar groups) despite a larger solubility and wider electrochemical window provided by organic media. The redox mechanism of quinones in protic media is simpler and better known than in aprotic media, where radical species are involved. This paper reports the behaviour of methyl-p-benzoquinone (MBQ) under electrochemical reduction conditions in a LiClO4[sbnd]CH3CN electrolyte and various working electrodes. We detected the reversible generation of a bright green coating on the working electrode and the subsequent formation of a polymer (the nature of which depends on the presence or absence of oxygen). These coatings prevent the regular redox process of methyl-p-benzoquinone from taking place on the surface of the electrode and is generated regardless of the electrode material used or the presence of O2 in solution. In addition to MBQ, the green passivating layer was also found for less sterically hindered quinones such as p-benzoquinone or 1,4-naphthoquinone, but not for anthraquinone. We have also shown the central role of Li+ in the formation of this green layer. This work provides important guidelines for the final use of quinones in RFBs with organic electrolytes. © 2017

  • Influence of texture in hybrid carbon-phosphomolybdic acid materials on their performance as electrodes in supercapacitors

    Palomino P., Suarez-Guevara J., Olivares-Marín M., Ruiz V., Dubal D.P., Gómez-Romero P., Tonti D., Enciso E. Carbon; 111: 74 - 82. 2017. 10.1016/j.carbon.2016.09.054.

    In this paper, phosphomolybdic acid H3PMo12O40 (PMo12) was anchored to four synthetic micro-mesoporous carbons and a commercial one to analyse the relationship between the porous texture of the support, the PMo12 adsorption and the performance of the resulting hybrid materials as electrodes in supercapacitors. The uptake of PMo12 on carbon supports follows a clear correlation with the micropore volume, which implies that PMo12 is mainly adsorbed in microporosity as a consequence of a greater confinement in this kind of pores instead of mesopores. Transmission electron microscopy indicates that the PMo12 adsorbed is homogeneously dispersed in the carbon texture. Finally, the addition of PMo12 to the original carbon electrodes provided capacitances up to 293 F per gram of electrode, substantially larger than the 206–240 F g−1 of the unmodified activated carbon. This result represented an increase of up to 35% in terms of gravimetric energy density and 160% in terms of volumetric energy density, after PMo12 integration into the carbon matrix. © 2016 Elsevier Ltd

  • Mimics of microstructures of Ni substituted Mn1−xNixCo2O4 for high energy density asymmetric capacitors

    Tamboli M.S., Dubal D.P., Patil S.S., Shaikh A.F., Deonikar V.G., Kulkarni M.V., Maldar N.N., Inamuddin, Asiri A.M., Gomez-Romero P., Kale B.B., Patil D.R. Chemical Engineering Journal; 307: 300 - 310. 2017. 10.1016/j.cej.2016.08.086.

    The preparation of nanostructured hierarchical Mn1−xNixCo2O4 metal oxides as efficient supercapacitors of different structures and configurations especially for the miniaturized electronics is still a challenge. In this context, we report template free facile hydrothermal synthesis of hierarchical nanostructured Mn1−xNixCo2O4 with excellent supercapacitive performance. Significantly, the morphology of pure MnCo2O4 transformed from 3D microcubes to 1D nanowires with incorporation of Ni. The electrochemical study shows highest specific capacitance i.e. 1762 F/g for Mn0.4Ni0.6Co2O4 with high cycling stability of 89.2% which is much higher than pristine MnCo2O4 and NiCo2O4. Later, asymmetric capacitor has been fabricated successfully using Mn0.4Ni0.6Co2O4 nanowires as positive electrode and activated carbon (AC) as negative electrode in a KOH aqueous electrolyte. An asymmetric cell could be cycled reversibly in the high-voltage range of 0–1.5 V and displays intriguing performances with a specific capacitance of 112.8 F/g (6.87 F/cm3) and high energy density of 35.2 Wh/kg (2.1 mWh/cm3). Importantly, this asymmetric capacitor device exhibits an excellent long cycle life along with 83.2% specific capacitance retained after 2000 cycles. © 2016 Elsevier B.V.

  • Nanostructured mixed transition metal oxides for high performance asymmetric supercapacitors: Facile synthetic strategy

    Tajik S., Dubal D.P., Gomez-Romero P., Yadegari A., Rashidi A., Nasernejad B., Inamuddin, Asiri A.M. International Journal of Hydrogen Energy; 42 (17): 12384 - 12395. 2017. 10.1016/j.ijhydene.2017.03.117.

    Exceptionally simple and cost-effective solid-state method is reported for the synthesis of different mixed transition metal oxides (MTMOs) including FeCo2O4, MnCo2O4 and ZnCo2O4 with unique nanostructures. The morphological analysis show that MTMOs possess distinct nanostructures such as tetragonal, spherical nanoparticles and hexagonal nanosheets. Furthermore, these MTMOs showed excellent supercapacitive properties with specific capacitances of 660–1263 F/g at current density of 2 A/g. Asymmetric capacitor was fabricated with FeCo2O4 as positive and activated carbon as negative electrode which exhibits a specific capacitance of 88 F/g with energy density of 24 Wh/kg (1.1 mWh/cm3) and cycle life (93%) over 5000 cycles. © 2017 Hydrogen Energy Publications LLC

  • Ultrahigh energy density supercapacitors through a double hybrid strategy

    Dubal D.P., Nagar B., Suarez-Guevara J., Tonti D., Enciso E., Palomino P., Gomez-Romero P. Materials Today Energy; 5: 58 - 65. 2017. 10.1016/j.mtener.2017.05.001.

    Herein, we are presenting all-solid-state symmetric supercapacitors (ASSSCs) with an innovative double hybrid strategy, where a hybrid material based on reduced graphene oxide (rGO) anchored with phoshotungstic acid, rGO-H3PW12O40) is combined with hybrid electrolyte (hydroquinone-doped gel electrolyte). Initially, a hybrid electrode is fabricated by decorating H3PW12O40 nanodots onto the surface rGO (rGO-PW12). Next, a symmetric cell based on rGO-PW12 electrodes was assembled with PVA-H2SO4 polymer gel-electrolyte. Interestingly, rGO-PW12 symmetric cell revealed a substantial enhancement in the cell performance as compared to parent rGO systems. It featured a widened potential range of 1.6 V, thereby providing 1.05 mWh/cm3 energy density. The electrochemical performance of rGO-PW12 cell was further advanced by introducing redox-active (hydroquinone) species in to the PVA-H2SO4 gel-electrolyte. Indeed, the performance of rGO-PW12 cell was surprisingly improved with an ultra-high energy density of 2.38 mWh/cm3 (more than two-fold). © 2017 Elsevier Ltd

  • Ultrathin Mesoporous RuCo2O4 Nanoflakes: An Advanced Electrode for High-Performance Asymmetric Supercapacitors

    Dubal D.P., Chodankar N.R., Holze R., Kim D.-H., Gomez-Romero P. ChemSusChem; 10 (8): 1771 - 1782. 2017. 10.1002/cssc.201700001.

    A new ruthenium cobalt oxide (RuCo2O4) with a unique marigold-like nanostructure and excellent performance as an advanced electrode material has been successfully prepared by a simple electrodeposition (potentiodynamic mode) method. The RuCo2O4 marigolds consist of numerous clusters of ultrathin mesoporous nanoflakes, leaving a large interspace between them to provide numerous electrochemically active sites. Strikingly, this unique marigold-like nanostructure provided excellent electrochemical performance in terms of high energy-storage capacitance (1469 F g−1 at 6 A g−1) with excellent rate proficiency and long-lasting operating cycling stability (ca. 91.3 % capacitance retention after 3000 cycles), confirming that the mesoporous nanoflakes participate in the ultrafast electrochemical reactions. Furthermore, an asymmetric supercapacitor was assembled using RuCo2O4 (positive electrode) and activated carbon (negative electrode) with aqueous KOH electrolyte. The asymmetric design allowed an upgraded potential range of 1.4 V, which further provided a good energy density of 32.6 Wh kg−1 (1.1 mWh cm−3). More importantly, the cell delivered an energy density of 12.4 Wh kg−1 even at a maximum power density of 3.2 kW kg−1, which is noticeably superior to carbon-based symmetric systems. © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

  • V2O5 encapsulated MWCNTs in 2D surface architecture: Complete solid-state bendable highly stabilized energy efficient supercapacitor device

    Pandit B., Dubal D.P., Gómez-Romero P., Kale B.B., Sankapal B.R. Scientific Reports; 7 ( 43430) 2017. 10.1038/srep43430.

    A simple and scalable approach has been reported for 2O5 encapsulation over interconnected multi-walled carbon nanotubes (MWCNTs) network using chemical bath deposition method. Chemically synthesized 2O5/MWCNTs electrode exhibited excellent charge-discharge capability with extraordinary cycling retention of 93% over 4000 cycles in liquid-electrolyte. Electrochemical investigations have been performed to evaluate the origin of capacitive behavior from dual contribution of surface-controlled and diffusion-controlled charge components. Furthermore, a complete flexible solid-state, flexible symmetric supercapacitor (FSS-SSC) device was assembled with 2O5/MWCNTs electrodes which yield remarkable values of specific power and energy densities along with enhanced cyclic stability over liquid configuration. As a practical demonstration, the constructed device was used to lit the 'VNIT' acronym assembled using 21 LED's. © The Author(s) 2017.


  • Ag:BiVO4 dendritic hybrid-architecture for high energy density symmetric supercapacitors

    Patil S.S., Dubal D.P., Tamboli M.S., Ambekar J.D., Kolekar S.S., Gomez-Romero P., Kale B.B., Patil D.R. Journal of Materials Chemistry A; 4 (20): 7580 - 7584. 2016. 10.1039/c6ta01980c. IF: 8.262

    We demonstrate the fabrication of Ag:BiVO4 with a dendritic architecture by a template free hydrothermal method. Then, symmetric cells based on Ag:BiVO4 electrodes were assembled which exhibit an extended voltage window of up to 1.6 V with an excellent energy density of 2.63 mW h cm-3 (38.43 W h kg-1) and a power density of 558 mW cm-3 (8.1 kW kg-1). © 2016 The Royal Society of Chemistry.

  • Aqueous synthesis of LiFePO4 with Fractal Granularity

    Cabán-Huertas Z., Ayyad O., Dubal D.P., Gómez-Romero P. Scientific Reports; 6 ( 27024) 2016. 10.1038/srep27024. IF: 5.228

    Lithium iron phosphate (LiFePO4) electrodes with fractal granularity are reported. They were made from a starting material prepared in water by a low cost, easy and environmentally friendly hydrothermal method, thus avoiding the use of organic solvents. Our method leads to pure olivine phase, free of the impurities commonly found after other water-based syntheses. The fractal structures consisted of nanoparticles grown into larger micro-sized formations which in turn agglomerate leading to high tap density electrodes, which is beneficial for energy density. These intricate structures could be easily and effectively coated with a thin and uniform carbon layer for increased conductivity, as it is well established for simpler microstructures. Materials and electrodes were studied by means of XRD, SEM, TEM, SAED, XPS, Raman and TGA. Last but not least, lithium transport through fractal LiFePO4 electrodes was investigated based upon fractal theory. These water-made fractal electrodes lead to high-performance lithium cells (even at high rates) tested by CV and galvanostatic charge-discharge, their performance is comparable to state of the art (but less environmentally friendly) electrodes.

  • Electroactive graphene nanofluids for fast energy storage

    Dubal D.P., Gomez-Romero P. 2D Materials; 3 (3, 031004) 2016. 10.1088/2053-1583/3/3/031004. IF: 9.611

    Graphenes have been extensively studied as electrode materials for energy storage in supercapacitors and batteries, but always as solid electrodes. The conception and development of graphene electroactive nanofluids (ENFs) reported here for the first time provides a novel way to 'form' graphene electrodes and demonstrates proof of concept for the use of these liquid electrodes for energy storage in novel flow cells.Astabilized dispersion of reduced graphene oxide (rGO) in aqueous sulfuric acid solution was shown to have capacitive energy storage capabilities parallel to those of solid electrode supercapacitors (169 F g-1(rGO)) but working up to much faster rates (from 1mV s-1 to the highest scan rate of 10 V s-1) in nanofluids with 0.025, 0.1 and 0.4 wt% rGO, featuring viscosities very close to that of water, thus being perfectly suitable for scalable flow cells. Our results provide proof of concept for this technology and include preliminary flow cell performance of rGO nanofluids under static and continuous flow conditions. Graphene nanofluids effectively behave as true liquid electrodes with very fast capacitive storage mechanism and herald the application not only of graphenes but also other 2D materials like MoS2 in nanofluids for energy storage and beyond. © 2016 IOP Publishing Ltd.

  • Electrochemical supercapacitive properties of polypyrrole thin films: influence of the electropolymerization methods

    Wolfart F., Dubal D.P., Vidotti M., Holze R., Gómez-Romero P. Journal of Solid State Electrochemistry; 20 (4): 901 - 910. 2016. 10.1007/s10008-015-2960-2. IF: 2.327

    A detailed study of the effects of different electropolymerization methods on the supercapacitive properties of polypyrrole (PPy) thin films deposited on carbon cloth is reported. Deposition mechanisms of PPy thin films through cyclic voltammetry (CV), potentiostatic (PS), and galvanostatic (GS) modes have been analyzed. The resulting PPy thin films have been characterized by X-ray photoelectron spectroscopy (XPS), SEM, and TEM. The electrochemical properties of PPy thin films were investigated by cyclic voltammetry and galvanostatic charge/discharge. The results showed that the different electrodeposition modes of synthesis significantly affect the supercapacitive properties of PPy thin films. Among different modes of electrodeposition, PPy synthesized by a potentiostatic mode exhibits maximum specific capacitance of 166 F/g with specific energy of 13 Wh/kg; this is attributed to equivalent proportions of the oxidized and neutral states of PPy. Thus, these results provide a useful orientation for the use of optimized electrodeposition modes for the growth of PPy thin films to be applied as electrode material in supercapacitors. © 2015, Springer-Verlag Berlin Heidelberg.

  • Fern-like rGO/BiVO4 hybrid nanostructures for high-energy symmetric supercapacitor

    Patil S.S., Dubal D.P., Deonikar V.G., Tamboli M.S., Ambekar J.D., Gomez-Romero P., Kolekar S.S., Kale B.B., Patil D.R. ACS Applied Materials and Interfaces; 8 (46): 31602 - 31610. 2016. 10.1021/acsami.6b08165. IF: 7.145

    Herein, we demonstrate the synthesis of rGO/BiVO4 hybrid nanostructures by facile hydrothermal method. Morphological studies reveal that rGO sheets are embedded in the special dendritic fern-like structures of BiVO4. The rGO/BiVO4 hybrid architecture shows the way to a rational design of supercapacitor, since these structures enable easy access of electrolyte ions by reducing internal resistance. Considering the unique morphological features of rGO/BiVO4 hybrid nanostructures, their supercapacitive properties were investigated. The rGO/BiVO4 electrode exhibits a specific capacitance of 151 F/g at the current density of 0.15 mA/cm2. Furthermore, we have constructed rGO/BiVO4 symmetric cell which exhibits outstanding volumetric energy density of 1.6 mW h/cm3 (33.7 W h/kg) and ensures rapid energy delivery with power density of 391 mW/cm3 (8.0 kW/kg). The superior properties of symmetric supercapacitor can be attributed to the special dendritic fern-like BiVO4 morphology and intriguing physicochemical properties of rGO. © 2016 American Chemical Society.

  • Growth of polypyrrole nanostructures through reactive templates for energy storage applications

    Dubal D.P., Caban-Huertas Z., Holze R., Gomez-Romero P. Electrochimica Acta; 191: 346 - 354. 2016. 10.1016/j.electacta.2016.01.078. IF: 4.803

    This work presents a facile reactive template route to prepare polypyrrole (PPy) with a given, chosen nanostructure among three different morphologies (i.e., nanotubes, nanofibers and urchins). This approach exploits the variability of MnO2 morphologies and its versatility as sacrificial template. The morphological evolution for this template-assisted growth of PPy nanostructures has been briefly explained. These unique architectures significantly enhance the electroactive surface area of the PPy nanostructures, leading to better interfacial/chemical distribution at the nanoscale, fast ion and electron transfer and good strain accommodation. Thus, when used as supercapacitor electrodes, a maximum specific capacitance of 604 F/g at a current density of 1.81 A/g was reached for PPy nanofibers. Even after more than 1000 cycles at 9 A/g, a capacitance of 259 F/g with 91% retention was achieved. Moreover, the same PPy nanofibers can be used as cathode material for lithium-ion batteries (LIBs), showing a capacity of 70.82 mAh/g at a rate of 0.10 C with good cycling stability and rate capability. Our results provide sound evidences that PPy nanostructures can be properly tuned and make the difference for the practical application of these materials in electrochemical energy storage devices. © 2016 Elsevier Ltd. All rights reserved.

  • Hybrid core-shell nanostructured electrodes made of polypyrrole nanotubes coated with Ni(OH)2 nanoflakes for high energy-density supercapacitors

    Wolfart F., Dubal D.P., Vidotti M., Gómez-Romero P. RSC Advances; 6 (18): 15062 - 15070. 2016. 10.1039/c5ra23671a. IF: 3.289

    This work describes the design of Ni(OH)2@PPy-NTs core-shell nanostructures with potential application as an electrode material for supercapacitors. Initially, one dimensional (1D) polypyrrole nanotubes (PPy-NTs) were synthesized through a chemical oxidation mediated soft template-directed route using as the anion the azo dye methyl orange (MO). Subsequently, three dimensional (3D) Ni(OH)2 nanoflakes were grown onto PPy-NTs by a simple hydrothermal route. This exclusive Ni(OH)2@PPy-NTs nano-architecture helps to improve the overall electrochemical performance of the electrode, due to the high surface area provided by 3D nanoflakes and excellent electronic/ionic conductivity of 1D nanotubes. The maximum specific capacitance obtained for Ni(OH)2@PPy-NTs was 536 F g-1 with good capacity retention after 1000 charge/discharge cycles. Last but not least, EIS technique showed a low electrochemical series resistance for Ni(OH)2@PPy-NTs confirming their promise as a high-performance energy storage material. © The Royal Society of Chemistry 2016.

  • Synthetic approach from polypyrrole nanotubes to nitrogen doped pyrolyzed carbon nanotubes for asymmetric supercapacitors

    Dubal D.P., Chodankar N.R., Caban-Huertas Z., Wolfart F., Vidotti M., Holze R., Lokhande C.D., Gomez-Romero P. Journal of Power Sources; 308: 158 - 165. 2016. 10.1016/j.jpowsour.2016.01.074. IF: 6.333

    Pseudocapacitive materials are highly capable to achieve high energy density integrated with high power electrostatic capacitive materials. However, finding a suitable electrostatic capacitive material to integrate with pseudocapacitive material in order to achieve high energy density with good rate capability is still a challenge. Herein, we are providing a novel synthetic approach starting from the synthesis of polypyrrole nanotubes (PPy-NTs) and ending up at the carbonization of PPy-NTs to obtain N-doped carbon nanotubes (N-CNTs). With highly porous nature of PPy-NTs and great graphitic texture with copious heteroatom functionalities, N-CNTs significantly promoted the faradic pseudo-capacitors, demonstrating high single-electrode capacitance over 332 F/g(PPy-NTs) and 228 F/g(N-CNTs) in 1 M H2SO4 aqueous solution. Further, a novel asymmetric supercapacitor with PPy-NTs as positive and N-CNTs as negative electrode has been fabricated. This PPy-NTs//N-CNTs cell effectively provides high operation voltage (1.4 V) and hence high energy density over 28.95 W h/kg (0.41 mW h/cm3) with a high power density of 7.75 kW/kg (113 mW/cm3) and cyclic stability of 89.98% after 2000 cycles. © 2016 Elsevier B.V. All rights reserved.


  • 3D hierarchical assembly of ultrathin MnO2 nanoflakes on silicon nanowires for high performance micro-supercapacitors in Li- doped ionic liquid

    Dubal D.P., Aradilla D., Bidan G., Gentile P., Schubert T.J.S., Wimberg J., Sadki S., Gomez-Romero P. Scientific Reports; 5 ( 9771) 2015. 10.1038/srep09771. IF: 5.578

    Building of hierarchical core-shell hetero-structures is currently the subject of intensive research in the electrochemical field owing to its potential for making improved electrodes for high-performance micro-supercapacitors. Here we report a novel architecture design of hierarchical MnO2 @silicon nanowires (MnO2 @SiNWs) hetero-structures directly supported onto silicon wafer coupled with Li-ion doped 1-Methyl-1-propylpyrrolidinium bis(trifluromethylsulfonyl)imide (PMPyrrBTA) ionic liquids as electrolyte for micro-supercapacitors. A unique 3D mesoporous MnO2 @SiNWs in Li-ion doped IL electrolyte can be cycled reversibly across a voltage of 2.2V and exhibits a high areal capacitance of 13Fcm-2. The high conductivity of the SiNWs arrays combined with the large surface area of ultrathin MnO2 nanoflakes are responsible for the remarkable performance of these MnO2 @SiNWs hetero-structures which exhibit high energy density and excellent cycling stability. This combination of hybrid electrode and hybrid electrolyte opens up a novel avenue to design electrode materials for high-performance micro-supercapacitors.

  • A high voltage solid state symmetric supercapacitor based on graphene-polyoxometalate hybrid electrodes with a hydroquinone doped hybrid gel-electrolyte

    Dubal D.P., Suarez-Guevara J., Tonti D., Enciso E., Gomez-Romero P. Journal of Materials Chemistry A; 3 (46): 23483 - 23492. 2015. 10.1039/c5ta05660h. IF: 7.443

    In pursuit of high capacitance and high energy density storage devices, hybrid materials have quickly garnered well-deserved attention based on their power to merge complementary components and properties. Here, we report the fabrication of all-solid state symmetric supercapacitors (ASSSC) based on a double hybrid approach combining a hybrid electrode (reduced graphene oxide-phoshomolybdate, rGO-PMo12) and a hybrid electrolyte (hydroquinone doped gel-electrolyte). To begin with, a high-performance hybrid electrode based on H3PMo12O40 nanodots anchored onto rGO was prepared (rGO-PMo12). Later, an all-solid state symmetric cell based on these rGO-PMo12 electrodes, and making use of a polymer gel-electrolyte was assembled. This symmetric cell showed a significant improvement in cell performance. Indeed, it allowed for an extended potential window by 0.3 V that led to an energy density of 1.07 mW h cm-3. Finally, we combined these hybrid electrodes with a hybrid electrolyte incorporating an electroactive species. This is the first proof-of-design where a redox-active solid-state gel-electrolyte is applied to rGO-PMo12 hybrid supercapacitors to accomplish a significant enhancement in the capacitance. Strikingly, a further excellent increase in the device performance (energy density of 1.7 mW h cm-3) was realized with the hybrid electrode-hybrid electrolyte combination cell as compared to that of the conventional electrolyte cell. Thus, this unique symmetric device outclasses the high-voltage asymmetric counterparts under the same power and represents a noteworthy advance towards high energy density supercapacitors. © The Royal Society of Chemistry 2015.

  • An innovative 3-D nanoforest heterostructure made of polypyrrole coated silicon nanotrees for new high performance hybrid micro-supercapacitors

    Aradilla D., Gaboriau D., Bidan G., Gentile P., Boniface M., Dubal D., Gómez-Romero P., Wimberg J., Schubert T.J.S., Sadki S. Journal of Materials Chemistry A; 3 (26): 13978 - 13985. 2015. 10.1039/c5ta03435c. IF: 7.443

    In this work, an innovative 3-D symmetric micro-supercapacitor based on polypyrrole (PPy) coated silicon nanotree (SiNTr) hybrid electrodes has been fabricated. First, SiNTrs were grown on silicon substrates by chemical vapor deposition (CVD) and then via an electrochemical method, the conducting polymer coating was deposited onto the surface of SiNTr electrodes. This study illustrates the excellent electrochemical performance of a hybrid micro-supercapacitor device using the synergistic combination of both PPy as the electroactive pseudo-capacitive material and branched SiNWs as the electric double layer capacitive material in the presence of an aprotic ionic liquid (N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide; PYR13TFSI) as the electrolyte. The hybrid device exhibited a specific capacitance as high as ∼14 mF cm-2 and an energy density value of ∼15 mJ cm-2 at a wide cell voltage of 1.5 V using a high current density of 1 mA cm-2. Furthermore, a remarkable cycling stability after thousands of galvanostatic charge-discharge cycles with a loss of approximately 30% was obtained. The results reported in this investigation demonstrated that PPy coated SiNTr-based micro-supercapacitors exhibit the best performances among hybrid micro-supercapacitors made of silicon nanowire electrodes grown by CVD in terms of specific capacitance and energy density. © The Royal Society of Chemistry.

  • Diamond-coated silicon nanowires for enhanced micro-supercapacitor with ionic liquids

    Gund G.S., Dubal D.P., Aradilla D., Mueller-Sebert W., Bidan G., Gaboriau D., Gentile P., Schubert T.J.S., Wimberg J., Sadki S., Gomez-Romero P. 2015 International Conference on Industrial Instrumentation and Control, ICIC 2015; ( 7150916): 1125 - 1128. 2015. 10.1109/IIC.2015.7150916.

    Silicon nanowires (SiNWs) and diamond-coated SiNWs (D@SiNWs) on highly n-doped silicon wafer substrates were prepared through standard chemical vapor deposition (CVD) method as electrodes for micro-supercapacitors. The surface of electrodes exhibited uniform distribution of SiNWs on silicon wafer and continuous diamond coating on SiNWs. Electrochemical measurements were carried out in order to test the combined effect of using Ionic Liquid electrolytes and diamond coating on SiNWs on energy storage performance. Optimal values of areal capacitance, energy density and power densities were 317 μF cm-2, 0.13 μWh cm-2 and 150 μW cm-2, respectively. So, the work reported here confirms the suitability and compatibility of D@SiNWs electrode materials and ionic liquid electrolytes for the fabrication of high-performing and robust micro-supercapacitors. © 2015 IEEE.

  • Hybrid energy storage: The merging of battery and supercapacitor chemistries

    Dubal D.P., Ayyad O., Ruiz V., Gómez-Romero P. Chemical Society Reviews; 44 (7): 1777 - 1790. 2015. 10.1039/c4cs00266k. IF: 33.383

    The hybrid approach allows for a reinforcing combination of properties of dissimilar components in synergic combinations. From hybrid materials to hybrid devices the approach offers opportunities to tackle much needed improvements in the performance of energy storage devices. This paper reviews the different approaches and scales of hybrids, materials, electrodes and devices striving to advance along the diagonal of Ragone plots, providing enhanced energy and power densities by combining battery and supercapacitor materials and storage mechanisms. Furthermore, some theoretical aspects are considered regarding the possible hybrid combinations and tactics for the fabrication of optimized final devices. All of it aiming at enhancing the electrochemical performance of energy storage systems. This journal is © The Royal Society of Chemistry.

  • Influence of Mn incorporation on the supercapacitive properties of hybrid CuO/Cu(OH)2 electrodes

    Shinde S.K., Dubal D.P., Ghodake G.S., Gomez-Romero P., Kim S., Fulari V.J. RSC Advances; 5 (39): 30478 - 30484. 2015. 10.1039/c5ra01093d. IF: 3.840

    Here, we are presenting the effect of Mn doping on the supercapacitive properties of CuO/Cu(OH)2 hybrid electrodes. Briefly, Mn doped CuO/Cu(OH)2 (Mn:CuO/Cu(OH)2) thin films have been synthesized by a successive ionic layer adsorption and reaction (SILAR) method which are further characterized by different physiochemical techniques. Our results revealed the formation of hybrid CuO/Cu(OH)2 thin films with significant morphological deviation through Mn doping. Moreover, considerable positive effect of Mn doping on the electrochemical properties of hybrid CuO/Cu(OH)2 electrodes have been witnessed. Later, the results suggest that at 3% Mn doping in CuO/Cu(OH)2 electrodes with nanoflower-like nanostructures exhibits the highest specific capacitance. The maximum specific capacitance achieved for a 3% Mn:CuO/Cu(OH)2 hybrid electrode is 600 F g-1 at 5 mV s-1 in 1 M Na2SO4 electrolyte. Additionally, a Ragone plot confirms the potential of the Mn:CuO/Cu(OH)2 hybrid electrode for electrical energy storage applications. © The Royal Society of Chemistry 2015.

  • Low-cost flexible supercapacitors with high-energy density based on nanostructured MnO2 and Fe2O3 thin films directly fabricated onto stainless steel

    Gund G.S., Dubal D.P., Chodankar N.R., Cho J.Y., Gomez-Romero P., Park C., Lokhande C.D. Scientific Reports; 5 ( 12454) 2015. 10.1038/srep12454. IF: 5.578

    The facile and economical electrochemical and successive ionic layer adsorption and reaction (SILAR) methods have been employed in order to prepare manganese oxide (MnO2) and iron oxide (Fe2O3) thin films, respectively with the fine optimized nanostructures on highly flexible stainless steel sheet. The symmetric and asymmetric flexible-solid-state supercapacitors (FSS-SCs) of nanostructured (nanosheets for MnO2 and nanoparticles for Fe2O3) electrodes with Na2SO4/Carboxymethyl cellulose (CMC) gel as a separator and electrolyte were assembled. MnO2 as positive and negative electrodes were used to fabricate symmetric SC, while the asymmetric SC was assembled by employing MnO2 as positive and Fe2O3 as negative electrode. Furthermore, the electrochemical features of symmetric and asymmetric SCs are systematically investigated. The results verify that the fabricated symmetric and asymmetric FSS-SCs present excellent reversibility (within the voltage window of 0-1 V and 0-2 V, respectively) and good cycling stability (83 and 91%, respectively for 3000 of CV cycles). Additionally, the asymmetric SC shows maximum specific capacitance of 92 Fg-1, about 2-fold of higher energy density (41.8 Wh kg-1) than symmetric SC and excellent mechanical flexibility. Furthermore, the "real-life" demonstration of fabricated SCs to the panel of SUK confirms that asymmetric SC has 2-fold higher energy density compare to symmetric SC. © 2015 Macmillan Publishers Limited.

  • Nickel cobaltite as an emerging material for supercapacitors: An overview

    Dubal D.P., Gomez-Romero P., Sankapal B.R., Holze R. Nano Energy; 11: 377 - 399. 2015. 10.1016/j.nanoen.2014.11.013. IF: 10.325

    Supercapacitor (SCs) with excellent power and reasonably high energy densities are becoming a perfect solution towards the recent demand of various energy storage applications. Present review is focused on the synthetic methods used for spinel NiCo2O4 nanomaterials with different mysterious architectures for supercapacitor application. Synthesis of different nanostructures, hetero-structures, chemical modification and incorporation with high surface area conductive nanoarchitectures are the major strategies in the development of recent high-performance NiCo2O4-based electrodes for supercapacitors. This review runs through the creativity of current science when it comes to these nano-architectured electrodes. It is organized by techniques used for synthesis including chemical methods with and without templates along with their electrochemical supercapacitive properties. Plentiful works reviewed in this review shown enhanced electrochemical performance in the spinel NiCo2O4-based electrode materials. Finally, the future research directions and the remaining challenges toward the fabrication of different nanostructured NiCo2O4-based electrode materials for next-generation SCs are discussed (224 references). © 2014 Elsevier Ltd.

  • SiNWs-based electrochemical double layer micro-supercapacitors with wide voltage window (4V) and long cycling stability using a protic ionic liquid electrolyte

    Aradilla D., Gentile P., Ruiz V., Gomez-Romero P., Wimberg J., Iliev B., Schubert T.J.S., Sadki S., Bidan G. Advances in Natural Sciences: Nanoscience and Nanotechnology; 6 (1, 15004) 2015. 10.1088/2043-6262/6/1/015004. IF: 0.000

    The present work reports the use and application of a novel protic ionic liquid (triethylammonium bis(tri fluoromethylsulfonyl)imide; NEt3H TFSI) as an electrolyte for symmetric planar micro-supercapacitors based on silicon nanowire electrodes. The excellent performance of the device has been successfully demonstrated using cyclic voltammetry, galvanostatic charge-discharge cycles and electrochemical impedance spectroscopy. The electrochemical characterization of this system exhibits a wide operative voltage of 4 V as well as an outstanding long cycling stability after millions of galvanostatic cycles at a high current density of 2 mA cm-2. In addition, the electrochemical double layer micro-supercapacitor was able to deliver a high power density of 4 mWcm-2 in a very short time pulses (a few ms). Our results could be of interest to develop prospective on-chip micro-supercapacitors using protic ionic liquids as electrolytes with high performance in terms of power and energy densities. © 2015 Vietnam Academy of Science & Technology.

  • The influence of solvents and salts on the properties of high-voltage cathode materials

    Kazda T., Vondrák J., Sedlaříková M., Gómez-Romero P., Musil M., Čudek P., Fedorková Straková A., Kašpárek V. International Journal of Electrochemical Science; 10 (8): 6288 - 6301. 2015. . IF: 1.500

    Lithium - ion batteries play an increasingly important role in the battery industry and they have become the dominant source of energy in the recent years, especially for portable electronic devices due to their high gravimetric energy density. This article examines the influence of mixtures of solvents with different combinations of lithium salts on the stability of two types of high-voltage cathode materials: LiNi0.5Mn1.5O4 and LiCr0.1Ni0.4Mn1.5O4 produced by a solid phase reaction. These materials were combined with several different electrolytes, cycled at various loads and higher temperature. Various combinations of solvents ethylene carbonate (EC), dimethyl carbonate (DMC) and Tetrahydrothiophene 1.1-dioxide (Sulfolane) were used for these measurements. Salts LiPF6 , LiNO3 and LiTFSI were used. The influence of solvents and salts on the properties of high-voltage cathode materials was tested by cycling at different current loads and by cycling at high temperature. It was found out, by LSV analysis, that the addition of Sulfolane increases the stability of electrolyte. The addition of chromium to the cathode material LiNi0.5Mn1.5O4 causes increasing of capacity and stability at high temperature. The combination of the cathode material LiCr0.1Ni0.4Mn1.5O4 with the electrolyte 1.5 M LiPF6 EC:DMC:Sulfolane 1:2:1 w/w/w leads to increased stability in comparison with other electrolytes. © 2015 The Authors.

  • Three-dimensional arrays of 1D MnO2 nanocrystals for all-solid-state asymmetric supercapacitors

    Dubal D.P., Holze R., Gomez-Romero P. ChemPlusChem; 80 (6): 944 - 951. 2015. 10.1002/cplu.201500054. IF: 3.026

    Abstract Reported is the synthesis of 3D hierarchical structures based on one-dimensional MnO2 nanobuilding blocks (nanorods, nanowires, and nanoneedles) by means of a facile and scalable coprecipitation method and their use as electrodes for the assembly of all-solid-state supercapacitors. Asymmetric devices were also assembled by using these nanostructured MnO2 materials as the positive electrode and reduced graphene oxide (rGO) as the negative electrode with a polymeric gel electrolyte. The asymmetric cells successfully extend the working voltage windows beyond 1.4 V and allowed for a maximum voltage of 1.8 V. An asymmetric device based on hierarchical nanoneedle-like MnO2 and rGO achieved a maximum specific capacitance of 99 Fg-1 at a scan rate of 10 mVs-1 with a stable operational voltage of 1.8 V. This high value allowed for a large specific energy of 24.12 Whkg-1. New builders on the block: The synthesis of 3D hierarchical structures based on 1D MnO2 nanobuilding blocks by means of a facile and scalable coprecipitation method and their use as electrodes for the assembly of all-solid-state supercapacitors is described. The figure show an example of an asymmetric device based on hierarchical nanoneedle (Nn)-like MnO2 and reduced graphene oxide. Copyright © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


  • Development of hybrid materials based on sponge supported reduced graphene oxide and transition metal hydroxides for hybrid energy storage devices

    Dubal, D.P.; Holze, R; Gomez-Romero, P. Scientific Reports; 2014. 10.1038/srep07349. IF: 5.078

  • High performance of symmetric micro-supercapacitors based on silicon nanowires using N-methyl-N-propylpyrrolidinium bis(trifluoromethylsulfonyl)imide as electrolyte

    Aradilla, D.; Gentile, P.; Bidan, G.; Ruiz, V.; Gómez-Romero, P.; Schubert, T.J.S.; Sahin, H.; Frackowiak, E.; Sadki, S. Nano Energy; 9: 273 - 281. 2014. 10.1016/j.nanoen.2014.07.001. IF: 10.211

  • Hybrid energy storage: High voltage aqueous supercapacitors based on activated carbon-phosphotungstate hybrid materials

    Suárez-Guevara, J.; Ruiz, V.; Gomez-Romero, P. Journal of Materials Chemistry A; 2 (4): 1014 - 1021. 2014. 10.1039/c3ta14455k. IF: 0.000

  • Novel hybrid micro-supercapacitor based on conducting polymer coated silicon nanowires for electrochemical energy storage

    Aradilla, D.; Bidan, G.; Gentile, P.; Weathers, P.; Thissandier, F.; Ruiz, V.; Gómez-Romero, P.; Schubert, T.J.S.; Sahin, H.; Sadki, S. RSC Advances; 4 (50): 26462 - 26467. 2014. 10.1039/c4ra03192j. IF: 3.708

  • Stable graphene-polyoxometalate nanomaterials for application in hybrid supercapacitors

    Suárez-Guevara, J.; Ruiz, V.; Gómez-Romero, P. Physical Chemistry Chemical Physics; 16 (38): 20411 - 20414. 2014. 10.1039/c4cp03321c. IF: 4.198


  • Fractal porosity in metals synthesized by a simple combustion reaction

    Gómez-Romero, P.; Fraile, J.; Ballesteros, B. RSC Advances; 3: 2351 - 2354. 2013. 10.1039/c2ra22441k. IF: 2.562

  • Incorporation of benzimidazolium ionic liquid in proton exchange membranes ABPBI-H3PO4

    Hernández Carrillo, R.; Suarez-Guevara, J.; Torres-González, L.C.; Gómez-Romero, P.; Sánchez, E.M. Journal of Molecular Liquids; 181: 115 - 120. 2013. 10.1016/j.molliq.2013.02.014. IF: 1.684

  • Organic-Inorganic Hybrid Materials for Supercapacitors

    Ruiz, V. ; Suárez-Guevara, J. ; Gomez-Romero, P. ECS transactions; 50 (43): 117 - 123. 2013. 10.1149/05043.0117ecst. IF: 0.000

  • Rechargeable Batteries: From Hybrid Materials to Devices .

    Gomez-Romero, P. ; Ruiz, V. ; Suarez-Guevara, J. ; Ayyad, O. ; Muñoz-Rojas, D. ECS transactions; 50 (24): 29 - 35. 2013. 10.1149/05024.0029ecst. IF: 0.000


  • Copper@Polypyrrole Nanocables

    Suárez-Guevara, J.; Ayyad, O.; Gómez-Romero, P. Nanoscale Research Letters; 2012. .

  • Hybrid electrodes based on polyoxometalate-carbon materials for electrochemical supercapacitors

    Ruiz, V.; Suárez-Guevara, J.; Gomez-Romero, P. Electrochemistry Communications; 24: 35 - 38. 2012. 10.1016/j.elecom.2012.08.003.

  • Rechargeable Batteries: From Hybrid Materials to Hybrid Electrodes and Devices

    Gomez-Romero, P. ; Ruiz, V. ; Suarez-Guevara, J.; Ayyad, O.; Muñoz-Rojas, D. ECS transactions; 50: B4-0652. 2012. .


  • Direct synthesis of a macroscopic array of naked Ag nanoparticles

    Ayyad, O.; Muñoz-Rojas, D.; Gómez-Romero, P. Chemical Communications; 47: 11285 - 11287. 2011. 10.1039/c1cc13353e.

  • Electrical and mechanical properties of poly(ethylene oxide)/intercalated clay polymer electrolyte

    Moreno, M.; Quijada, R.; Santa Ana, M.A.; Benavente, E.; Gomez-Romero, P.; González, G. Electrochimica Acta; 58: 112 - 118. 2011. 10.1016/j.electacta.2011.08.096.

  • Polydiphenylamine/carbon nanotube composites for applications in rechargeable lithium batteries

    Baibarac, M.; Baltog, I.; Lefrant, S.; Gomez-Romero, P. Materials Science & Engineering B: Solid-State Materials for Advanced Technology; 176: 110 - 120. 2011. 10.1016/j.mseb.2010.10.008.

  • Polymer electrolyte membrane fuel cells | Pilas de combustible de membrana polimérica

    Asensio, J.A.; Peña, J.; Pérez-Coll, D.; Ruiz-Morales, J.C.; Marrero-Lopez, D.; Nuñez, P.; Ballesteros, B.; Canales-Vazquez, J.; Borrós, S.; Gómez-Romero, P. Afinidad; 68: 246 - 258. 2011. .

  • Shaping hybrid nanostructures with polymer matrices: The formation mechanism of silver-polypyrrole core/shell nanostructures

    Muñoz-Rojas, D.; Oró-Solé, J.; Ayyad, O.; Gómez-Romero, P. Journal of Materials Chemistry; 21: 2078 - 2086. 2011. 10.1039/c0jm01449d.


  • From silver nanoparticles to nanostructures through matrix chemistry

    Ayyad, O.; Muñoz-Rojas, D.; Oró-Solé, J.; Gómez-Romero, P. Journal of Nanoparticle Research; 12: 337 - 345. 2010. 10.1007/s11051-009-9620-3.

  • High-concentration compact agar gels from hydrothermal synthesis

    Ayyad, O.; Muñoz-Rojas, D.; Agulló, N.; Borrós, S.; Gómez-Romero, P. Soft Matter; 6: 2389 - 2391. 2010. 10.1039/b926713a.

  • Hybrid organic-inorganic materials: From child's play to energy applications

    Gómez-Romero, P.; Ayyad, O.; Suárez-Guevara, J.; Muñoz-Rojas, D. Journal of Solid State Electrochemistry; 14 (11): 1939 - 1945. 2010. 10.1007/s10008-010-1076-y.

  • Polyfluorinated boron cluster - [B12F11H]2- - based electrolytes for supercapacitors: Overcharge protection

    Ionica-Bousquet, C.M.; Casteel Jr., W.J.; Pearlstein, R.M.; GirishKumar, G.; Pez, G.P.; Gómez-Romero, P.; Palacín, M.R.; Muñoz-Rojas, D. Electrochemistry Communications; 12: 636 - 639. 2010. 10.1016/j.elecom.2010.02.018.

  • Proton-conducting membranes based on benzimidazole polymers for high-temperature PEM fuel cells. A chemical quest

    Asensio, J.A.; Sánchez, E.M.; Gómez-Romero, P. Chemical Society Reviews; 39: 3210 - 3239. 2010. 10.1039/b922650h.

  • Structural and electrochemical studies of PPy/PEG-LiFePO4 cathode material for Li-ion batteries

    Fedorková, A.; Nacher-Alejos, A.; Gómez-Romero, P.; Orináková, R.; Kaniansky, D. Electrochimica Acta; 55: 943 - 947. 2010. 10.1016/j.electacta.2009.09.060.

  • Titanium dioxide/amine hybrid nanotubes. Optical properties and behavior as lithium-ion electrode

    Vasquez, J; López, Z; Zuñiga, A; Nacher, A; Lira-Cantú, M; Gómez-Romero, P; Ana, M.A.S; Benavente, E; González, G. Electrochimica Acta; 55 (4): 1373 - 1379. 2010. 10.1016/j.electacta.2009.05.010.


  • Complementary microstructural and chemical analyses of Sepia officinalis endoskeleton

    Florek, M.; Fornal, E; Gómez-Romero, P; Zieba, E; Paszkowicz, W; Lekki, J; Nowak, J; Kuczumow, A. MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC AND SUPRAMOLECULAR SYSTEMS; 29 (4): 1220 - 1226. 2009. 10.1016/j.msec.2008.09.040.

  • High-Yield preparation of titanium dioxide nanostructures by hydrothermal conditions

    Vasquez, J; Lozano, H; Lavayen, V; Lira-Cantu, M; Gomez-Romero, P; Ana, M.A.S; Benavente, E; Gonzalez, G. Journal of Nanoscience and Nanotechnology; 9 (2): 1103 - 1107. 2009. 10.1166/jnn.2009.C097.

  • Spontaneous self-assembly of Cu2O@PPy nanowires and anisotropic crystals

    Muñoz-Rojas, D.; Oró-Solé, J.; Gómez-Romero, P. Chemical Communications; : 5913 - 5915. 2009. 10.1039/b910796g.

  • Surface enhanced Raman scattering studies on poly(3,4-ethylene dioxythiophene)/single-walled carbon nanotubes composites and their application to rechargeable lithium batteries

    Baltog, I; Baibarac, M; Lefrant, S; Gomez-Romero, P. Journal of Nanoscience and Nanotechnology; 9 (10): 6204 - 6209. 2009. 10.1166/jnn.2009.1548.


  • Conjugated polymers as part of multifunctional organic/inorganic hybrid materials for photovoltaic applications Symposium on Organic-Inorganic Hybrid Materials, Apr 9-13, 2007 San Francisco, USA Source: ORGANIC/INORGANIC HYBRID MATERIALS - 2007 Book Series: MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS

    Lira-Cantu, M.; Krebs, F.C.; Gomez-Romero, P.; Yanagida, S. Materials Research Society Symposium - Proceedings; 1007: 249 - 257. 2008. .

  • Facile one-pot synthesis of self-assembled silver@polypyrrole core/shell nanosnakes

    Muñoz-Rojas, D.; Oró-Solé, J.; Ayyad, O.; Gómez-Romero, P. Small; 4: 1301 - 1306. 2008. 10.1002/smll.200701199.

  • From nanosnakes to nanosheets: A matrix-mediated shape evolution

    Muñoz-Rojas, D.; Oró-Solé, J.; Gómez-Romero, P. Journal of Physical Chemistry C; 112: 20312 - 20318. 2008. 10.1021/jp808187w.


  • Improvement in the Ppy/V2O5 hybrid as a cathode material for Li ion batteries using PSA as an organic additive

    Boyano, I.; Bengoechea, M.; de Meatza, I.; Miguel, O.; Cantero, I.; Ochoteco, E.; Rodríguez, J.; Lira-Cantú, M.; Gómez-Romero, P. Journal of Power Sources; 166: 471 - 477. 2007. 10.1016/j.jpowsour.2006.12.106.

  • Influence of acids in the Ppy/V2O5 hybrid synthesis and performance as a cathode material

    Boyano, I.; Bengoechea, M.; de Meatza, I.; Miguel, O.; Cantero, I.; Ochoteco, E.; Grande, H.; Lira-Cantú, M.; Gomez-Romero, P.; Gómez-Romero, P. Journal of Power Sources; 174: 1206 - 1211. 2007. 10.1016/j.jpowsour.2007.06.175.

  • Spectroscopic evidence for the bulk polymerization of N-vinyl carbazole in the presence of single-walled carbon nanotubes

    Baibarac Mihaela*; Baltog Ioan; Lefrant Serge; Gomez-Romero Pedro Polymer; 48 (18): 5279 - 5280. 2007. .


  • Hybrid materials approach in the design of electrodes and electrolytes for energy storage and conversion

    Cuentas-Gallegos, K.; Lira-Cantú, M.; Casañ-Pastor, N.; Asensio, J.A.; Gómez-Romero, P. Materials Research Society Symposium - Proceedings; 847 (Article number EE12.4): 431 - 438. 2005. .

  • Recent developments on proton conducting Poly(2,5-benzimidazole) (ABPBI) membranes for high temperature polymer electrolyte membrane fuel cells

    Asensio, J.A.; Gómez-Romero, P. Fuel Cells; 5 (3): 336 - 343. 2005. 10.1002/fuce.200400081.