Efficient hydrogen evolution on (CuInS 2 ) x (ZnS) 1-x solid solution-based photocathodes under simulated sunlight.

A thin film of (CuInS2)x(ZnS)1-x has been developed as a photocathode for solar water splitting for the first time. A superior photoelectrochemical performance has been achieved, mainly attributed to the formation of a solid solution by CuInS2 and ZnS, which proved to be an effective strategy to improve the onset potential and efficiency of CuInS2 photocathodes.