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Black Si-doped TiO2 nanotube photoanode for high-efficiency photoelectrochemical water splitting
Zhenbiao Dong1, Dongyan Ding1, Ting Li1
1Institute of Electronic Materials and Technology, School of Materials Science and Engineering, Shanghai Jiao Tong University Shanghai 200240 China dyding@sjtu.edu.cn.
Abstract:
Black Si-doped TiO2 (Ti-Si-O) nanotubes were fabricated through Zn metal reduction of the Ti-Si-O nanotubes on Ti-Si alloy in an argon atmosphere. The nanotubes were used as a photoanode for photoelectrochemical (PEC) water splitting. Both Si element and Ti3+/oxygen vacancies were introduced into the black Ti-Si-O nanotubes, which improved optical absorption and facilitated the separation of the photogenerated electron-hole pairs. The photoconversion efficiency could reach 1.22%, which was 7.18 times the efficiency of undoped TiO2. It demonstrated that a Si element and Ti3+/oxygen vacancy co-doping strategy could offer an effective method for fabricating a high-performance TiO2-based nanostructure photoanode for improving PEC water splitting.
