▎ 摘　　要

NOVELTY - Photocatalyst comprises a conductive material having graphene nanostructures attached to the surface of a photoactive metal oxide semiconductor including strontium titanate or cerium oxide, where the photoactive metal oxide semiconductor has a microstructure or larger structure. USE - The photocatalyst is useful for catalyzing photocatalytic electrolysis of water to convert water to hydrogen and oxygen (claimed). ADVANTAGE - The photocatalyst: utilizes noble metals dispersed on the surface of a photoactive material; reduces or suppresses electron-hole recombination rate; decreases the complexity and costs associated with photocatalytic water-splitting systems. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a water splitting system comprising a transparent container comprising the photocatalyst as aforementioned, and a light source for irradiating the aqueous solution; and (2) converting water to hydrogen and oxygen, comprising irradiating an aqueous solution comprising the photocatalyst and water with UV irradiation, where water is converted into hydrogen and oxygen. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the water splitting system. Photocatalyst system (10) Photoactive metal oxide (12) Excited electron (13) Conductive band (15) Graphene nanostructure (17)