期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 20, 页码 17762-17769出版社
AMER CHEMICAL SOC
DOI: 10.1021/am504283t
关键词
bismuth vanadate; calcium ferrite; heterojunction photoanode; photoelectrochemical cell; water splitting
资金
- Korea Center for Artificial Photosynthesis (KCAP) [2009-0093880]
- Basic Science Research Program [2012-017247]
- A3 Foresight program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Creative Future Planning
- BK+ program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT and Creative Future Planning
A bismuth vanadate photoanode was first fabricated by the metal-organic decomposition method and particles of calcium ferrite were electrophoretically deposited to construct a heterojunction photoanode. The characteristics of the photoanodes were investigated in photoelectrochemical water oxidation under simulated 1 sun (100 mW cm(-2)) irradiation. Relative to the pristine BiVO4 anode, the formation of the heterojunction structure of CaFe2O4/BiVO4 increased the photocurrent density by about 60%. The effect of heterojunction formation on the transfer of charge carriers was investigated using hydrogen peroxide as a hole scavenger. It was demonstrated that the heterojunction formation reduced the charge recombination on the electrode surface with little effect on bulk recombination. The modification with an oxygen evolving catalyst, cobalt phosphate (Co-Pi), was also beneficial for improving the efficiency of CaFe2O4/BiVO4 heterojunction photoanode mainly by increasing the stability.
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