Citation: HU Yu-Xiang, JIANG Chun-Xiang, FANG Liang, ZHENG Fen-Gang, DONG Wen, SU Xiao-Dong, SHEN Ming-Rong. Effect of HF Treatment on the Photoelectrochemical Properties of a Hematite Thin Film Photoanode for Water Splitting[J]. Acta Physico-Chimica Sinica, ;2014, 30(6): 1099-1106. doi: 10.3866/PKU.WHXB201404282 shu

Effect of HF Treatment on the Photoelectrochemical Properties of a Hematite Thin Film Photoanode for Water Splitting

1.
Jiangsu Key Laboratory of Thin Films and College of Physics, Optoelectronics and Energy, Soochow University, Suzhou 215006, Jiangsu Province, P. R. China

Received Date: 21 March 2014
Available Online: 28 April 2014
Fund Project:

The effects of HF treatment on the photoelectrochemical (PEC) properties of sol-gel prepared hematite (α-Fe₂O₃) thin films were investigated. Pores and interstices between the grains developed on the film surface as the HF etching time increased. The photocurrent density of the α-Fe₂O₃ photoanode decreased within the first 5 min of etching, and then increased quickly as the etching time increased. At longer time than 15 min the photocurrent density deteriorated. Re-annealing the etched samples significantly enhanced the photocurrent density. Based on electrochemical impedance spectroscopy, Raman and X-ray photoelectron spectroscopies, we propose that two factors contribute to photocurrent density reversely: the porosity and the lowered crystallinity of the α-Fe₂O₃ surface because of HF treatment.Aschematic model was compiled to explain the enhanced PEC activities of the etched plus re-annealed α-Fe₂O₃ photoanode. The PEC and water splitting measurements showed that the etched plus re-annealed photoanode is more stable than the as-prepared one.
- α-Fe₂O₃ photoelectrode,
- Surface treatment,
- Photoelectrochemical property
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