Bismuth vanadate (BiVO4) is incorporated with reduced graphene oxide (RGO) using a facile single step photocatalytic reaction to improve its photoresponse in visible light. Remarkable 10-fold enhancement in photoelectrochemical water splitting reaction is observed on BiVO4-RGO composite compared with pure BiVO4 under visible illumination. Besides, the effectiveness of RGO as a solid electron mediator for water splitting in the Z-scheme photocatalysis system is also demonstrated. The photoreduced RGO can shuttle electrons from the O2-evolving photocatalyst BiVO4 to the H2-evolving photocatalyst Ru/SrTiO3:Rh, tripling the consumption of electron-hole pairs in the photocatalytic water splitting.
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