12 July

Semiconductor Composite Materials for Energy Storage and Conversion Applications

Thursday 12 July 2018, 11:00am

ICN2 Seminar Hall, ICN2 Building, UAB

PhD: PengYi Tang

Directors: ICREA Prof. Jordi Arbiol Advanced Electron Nanoscopy Group Leader at ICN2 and Prof. Joan Ramon Morante, Head of the Advanced Materials and Devices for Energy Area at IREC.

Short Abstract: The energy originated from fossil fuels has enabled the remarkable advancement of civilization over the past century. However, fossil fuels are not infinite in supply and they are a source of increasing atmospheric carbon dioxide and the associated abominable environmental effects. Improving the efficiency of the energy storage devices and conversion of solar energy into hydrogen energy via water splitting are key technologies to tackle the serious energy and environmental problems. Earth-abundant, environmental-friendly semiconductors for supercapacitor and water splitting applications have received great attention due to their specific characteristics.

It is well established that the capacitive properties of semiconductors are greatly affected by their nanostructure and poor conductivity, leading to a limited energy and power densities. Thus, understanding and manipulating the hierarchical structure at the nanoscale is essential to design composite materials for energy storage with enhanced charge transfer and electrolyte ions transportation abilities. On one hand, in photoelectrochemical water splitting (PEC), the electron-hole recombination in the bulk interfaces plays a determinative role in the catalytic performance. The investigation about modulation of the charge transfer kinetics as well as the energy level and density of surface state upon the modification of a second semiconductor or oxygen evolution catalysts (OEC) could be of great interest. On the other hand, for hydrogen evolution catalysts (HEC), as the identification of structural defects, phase transmission and vacancies presented in the 2D materials play a vital role in optimizing the catalyst for hydrogen evolution reaction (HER) in water splitting