Citation: Zhu Yaodong, Qian Qinfeng, Fan Guozheng, Zhu Zhili, Wang Xin, Li Zhaosheng, Zou Zhigang. Insight into the influence of high temperature annealing on the onset potential of Ti-doped hematite photoanodes for solar water splitting[J]. Chinese Chemical Letters, ;2018, 29(6): 791-794. doi: 10.1016/j.cclet.2018.01.022 shu

Insight into the influence of high temperature annealing on the onset potential of Ti-doped hematite photoanodes for solar water splitting

Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, and College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China

Corresponding author: Li Zhaosheng, zsli@nju.edu.cn
Received Date: 30 November 2017
Revised Date: 27 December 2017
Accepted Date: 12 January 2018
Available Online: 1 July 2018

Figures(5)

For Ti-doped hematite photoanodes, high temperature annealing drastically increases the water oxidation plateau photocurrent, but also induces an anodic shift of onset potential by about 100 mV, thus hindering the performance under low applied bias. To the best of our knowledge, the effects of high temperature annealing on the onset potential have been rarely studied. Herein, both X-ray photoelectron spectroscopy (XPS) measurements and theoretical calculations indicated that the increase of surface Ti/Fe atomic ratio after high temperature annealing decreased the adsorption capacity of hydroxide ions on the hematite surface. Subsequently, the flatband potential (i.e., the theoretical onset potential) of Ti doped hematite photoanodes positively shifted, which was supported by the Mott-Schottky measurements.
- Onset potential,
- Hematite,
- Ti doping,
- High temperature annealing,
- Flatband potential,
- DFT calculation
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