摘要：A novel metal/semiconductor photocatalyst,Cu nanoparticles(NPs)modified TiO2 hollow spheres(Cu/TiO2),was designed for efficient photocatalytic overall water splitting(POWs)under both ultraviolet(UV)and visible(Vis)*** Cu/TiO2 photocatalyst possesses excellent POWs performance under Vis light at the highest level among the reported TiO2-based ***,the metal/semiconductor junction formed between Cu and TiO2 enables controlled water-oxidation product selectivity(H2O2 or O2)via different reaction pathways regulated by irradiation *** UV light,the electrons excited in TiO2 are captured by Cu NPs through the Cu/TiO2 schottky interface for H2 production,with the photoholes in TiO2 producing H2O2 through a two-electron process;whilst under Vis light,Cu NPs act as plasmon to inject hot electrons to TiO2 for H2 production,while O2 is produced by hot holes on Cu NPs via a four-electron *** rational design of function-switchable metal/semiconductor junction may be helpful to understand the mechanisms for POWs with desired gas/liquid water-oxidation products.