Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 8, Pages 5076-5081Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp210207q
Keywords
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Funding
- National Natural Science Foundation of China [50902068, 11174129, 51102132, 21073090]
- National Basic Research Program of China [2011CB933303]
- Jiangsu Provincial Science and Technology Research Program [BK2011056]
- Fundamental Research Funds for the Central Universities
- State Key Laboratory of Bioelectronics, Southeast University
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The surface pretreatment by electrochemical cyclic voltammetry (CV) in the dark was found to remarkably enhance the photocurrent of Mo-doped BiVO4 from the front side illumination. The variation of the samples before and after the surface pretreatment was investigated by scanning electron microscopy, X-ray photoelectron spectroscopy, and Mott-Schottky methods. The results showed that the photocurrent enhancement came from both the removal of the surface recombination center, including Mo6+ ions, and reoxidation of the reduced species. The part of the reduced ions can be reoxidized in air. However, the photocurrent enhancement fromMo(6+) dissolution can be kept at high potential under illumination. A possible mechanism was also proposed to explain the the reason for the photocurrent enhancement.
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