P-type gallium phosphide (p-GaP) is a promising photocathode material for water splitting due to its small bandgap and proper band edge position. In this work, we demonstrate that p-type GaP particles can be used as a hydrogen evolution photocatalyst with the help of HER co-catalysts such as Pt, Ni2P, MoS2 and Rh2-yCryO3 in the presence of a variety of sacrificial reagent under visible light irradiation. Optical spectroscopy, surface photovoltage spectroscopy, and photoelectrochemistry are used to measure the effective band gap, light penetration depth, majority carrier type, photovoltage, charge separation ability, and depletion layer in this material. Analysis of these parameters provides an understanding of the factors that limit hydrogen evolution ability with p-type main group element semiconductors.

P-type gallium phosphide particles as hydrogen evolution photocatalysts

256th National Meeting (2018)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.