Staff directory Yunhui Yang



  • Clip-off Chemistry: Synthesis by Programmed Disassembly of Reticular Materials**

    Yang Y., Broto-Ribas A., Ortín-Rubio B., Imaz I., Gándara F., Carné-Sánchez A., Guillerm V., Jurado S., Busqué F., Juanhuix J., Maspoch D. Angewandte Chemie - International Edition; 61 (4, e202111228) 2022. 10.1002/anie.202111228. IF: 15.336

    Bond breaking is an essential process in chemical transformations and the ability of researchers to strategically dictate which bonds in a given system will be broken translates to greater synthetic control. Here, we report extending the concept of selective bond breaking to reticular materials in a new synthetic approach that we call Clip-off Chemistry. We show that bond-breaking in these structures can be controlled at the molecular level; is periodic, quantitative, and selective; is effective in reactions performed in either solid or liquid phases; and can occur in a single-crystal-to-single-crystal fashion involving the entire bulk precursor sample. We validate Clip-off Chemistry by synthesizing two topologically distinct 3D metal-organic frameworks (MOFs) from two reported 3D MOFs, and a metal-organic macrocycle from metal-organic polyhedra (MOP). Clip-off Chemistry opens the door to the programmed disassembly of reticular materials and thus to the design and synthesis of new molecules and materials. © 2021 The Authors. Angewandte Chemie International Edition published by Wiley-VCH GmbH

  • Ionic Liquid Stabilized Perovskite Solar Modules with Power Conversion Efficiency Exceeding 20%

    Wang Y., Yang Y., Li N., Hu M., Raga S.R., Jiang Y., Wang C., Zhang X.-L., Lira-Cantu M., Huang F., Cheng Y.-B., Lu J. Advanced Functional Materials; 2022. 10.1002/adfm.202204396.

    Metal-halide perovskite solar cells (PSCs) exhibit outstanding power conversion efficiencies (PCEs) when fabricated as mm-sized devices, but creation of high-performing large-area modules that are stable on a sufficiently long timescale still presents a significant challenge. Herein, the quality of large-area perovskite film is improved by using ionic liquid additives via forming a new Pb-N bonding between the ionic liquid and Pb2+. This new bond can be modulated by a critical screening of the anion structure of the ionic liquid. The selected ionic liquid effectively reduces the defects of the perovskite films and markedly elongate their carrier lifetimes. As a result, a champion PCE of 24.4% for small-area (0.148 cm2) devices and 20.4% for larger-area (10.0 cm2) modules under AM 1.5G irradiation is achieved. More importantly, the modified devices retain 90% of their peak PCE after aging for 1900 h at 65 ± 5 °C (ISOS-T-1) and 80% after continuous light soaking for 750 h. The non-encapsulated modules maintained 80% of their peak PCE after 1100 h of aging in the air with a relative humidity of 35 ± 5% and temperature of 25 ± 5 °C under dark (ISOS-D-1), showing great potential for future commercialization. © 2022 Wiley-VCH GmbH.


  • Enzyme-Powered Porous Micromotors Built from a Hierarchical Micro- And Mesoporous UiO-Type Metal-Organic Framework

    Yang Y., Arqué X., Patiño T., Guillerm V., Blersch P.-R., Pérez-Carvajal J., Imaz I., Maspoch D., Sánchez S. Journal of the American Chemical Society; 142 (50): 20962 - 20967. 2020. 10.1021/jacs.0c11061. IF: 14.612

    Here, we report the design, synthesis, and functional testing of enzyme-powered porous micromotors built from a metal-organic framework (MOF). We began by subjecting a presynthesized microporous UiO-type MOF to ozonolysis, to confer it with mesopores sufficiently large to adsorb and host the enzyme catalase (size: 6-10 nm). We then encapsulated catalase inside the mesopores, observing that they are hosted in those mesopores located at the subsurface of the MOF crystals. In the presence of H2O2 fuel, MOF motors (or MOFtors) exhibit jet-like propulsion enabled by enzymatic generation of oxygen bubbles. Moreover, thanks to their hierarchical pore system, the MOFtors retain sufficient free space for adsorption of additional targeted species, which we validated by testing a MOFtor for removal of rhodamine B during self-propulsion. © 2020 American Chemical Society.

  • Selective Methanol-to-Formate Electrocatalytic Conversion on Branched Nickel Carbide

    Li J., Wei R., Wang X., Zuo Y., Han X., Arbiol J., Llorca J., Yang Y., Cabot A., Cui C. Angewandte Chemie - International Edition; 59 (47): 20826 - 20830. 2020. 10.1002/anie.202004301. IF: 12.959

    A methanol economy will be favored by the availability of low-cost catalysts able to selectively oxidize methanol to formate. This selective oxidation would allow extraction of the largest part of the fuel energy while concurrently producing a chemical with even higher commercial value than the fuel itself. Herein, we present a highly active methanol electrooxidation catalyst based on abundant elements and with an optimized structure to simultaneously maximize interaction with the electrolyte and mobility of charge carriers. In situ infrared spectroscopy combined with nuclear magnetic resonance spectroscopy showed that branched nickel carbide particles are the first catalyst determined to have nearly 100 % electrochemical conversion of methanol to formate without generating detectable CO2 as a byproduct. Electrochemical kinetics analysis revealed the optimized reaction conditions and the electrode delivered excellent activities. This work provides a straightforward and cost-efficient way for the conversion of organic small molecules and the first direct evidence of a selective formate reaction pathway. © 2020 Wiley-VCH GmbH