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Particulate metal selenides having narrow bandgaps for photocatalytic overall pure water splitting have not yet been reported due to the severe self-photooxidation of such materials. The present work demonstrates that solid solutions of zinc selenide and copper gallium selenide (ZnSe:CGSe), with absorption edges ranging from 480 to 750 nm, can be employed as H2 evolution photocatalysts in particulate photocatalyst sheets for Z-scheme pure water splitting, where CoOx/BiVO4 and Au are used as the oxygen evolution photocatalyst and electron mediator, respectively. Photogenerated holes in the metal selenide are efficiently recombined with electrons from BiVO4via the Au layer, thus avoiding self-oxidation of the selenides and leading to stable pure water splitting. Varying the ZnSe:CGSe composition demonstrates that both the p-type semiconductor character and excellent photoelectrochemical properties of selenides are vital to efficient Z-scheme water splitting. This study extends the application field of metal selenides in photocatalytic pure water splitting and creates new opportunities for selenide-based photocatalytic systems for solar fuel production.

Metal selenide photocatalysts for visible-light-driven Z-scheme pure water splitting