In our investigation on a CuInS2electro-deposited ZnO composite in afrequency regulated manner for photoelctrochemcial water split-ting we discovered that the heterojunction between CuInS2andZnO facilitated efficient charge shuttling from CuInS2to ZnO toyield a four-fold visible light response compared with traditionallysynthesized CuInS2–ZnO nanostructures