LAUSR

Abstract A novel Cu 2 O/{101}TiO 2 nanosheet (Cu 2 O/{101}TNS) array film was prepared by the electrodeposition of Cu 2 O on the {101} facets of anatase nanosheet arrays by varying electrodeposition potential. The crystal structure, morphology, elemental chemical states, optical properties, photoelectrochemical properties, and stability of Cu 2 O/{101}TNS array films were investigated in detail. For TNS, due to different band structures and band edge positions between {001} and {101} facets, Cu 2 O/{101} facets of TiO 2 have higher band offset value which supply a larger driving force to increase the transport efficiency of carriers. Besides, owing to the directional flow of photo-generated electrons from {001} to {101} facets, the electrodeposition of Cu 2 O on the {101} facets of TNS will shorten the route length that the electrons must travel, thus reduce recombination of photo-generated electron-hole pairs. In addition, as the applied negative potential is high enough, a part of Cu + is reduced to Cu, which is beneficial for the photoexcited electrons transfer from CB of Cu 2 O to that of TiO 2 . The enhanced photoelectrochemical properties of Cu 2 O/{101}TNS array films can be attributed to the cocontributions of different band edge positions between {001} and {101} facets, Cu 2 O-Cu-TiO 2 ternary components and vertically aligned single-crystal TiO 2 nanosheet structure.