کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6457135 | 1420658 | 2017 | 9 صفحه PDF | دانلود رایگان |
- Cu2O was electrodeposited on the {101} facets of anatase nanosheet array film.
- Different band edge positions between {001} and {101} facets.
- Cu2O/{101} facets have higher band offset value.
A novel Cu2O/{101}TiO2 nanosheet (Cu2O/{101}TNS) array film was prepared by the electrodeposition of Cu2O 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 Cu2O/{101}TNS array films were investigated in detail. For TNS, due to different band structures and band edge positions between {001} and {101} facets, Cu2O/{101} facets of TiO2 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 Cu2O 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 Cu2O to that of TiO2. The enhanced photoelectrochemical properties of Cu2O/{101}TNS array films can be attributed to the cocontributions of different band edge positions between {001} and {101} facets, Cu2O-Cu-TiO2 ternary components and vertically aligned single-crystal TiO2 nanosheet structure.
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Journal: Solar Energy Materials and Solar Cells - Volume 165, June 2017, Pages 27-35