期刊
ADVANCED ENERGY MATERIALS
卷 8, 期 32, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.201802198
关键词
BiVO4; directional diffusion; homojunctions; twin structures; water oxidation
类别
资金
- Basic Science Center Project of NSFC [51788104]
- National Natural Science Foundation of China [51672150]
- Fund of Key Laboratory of Advanced Materials of Ministry of Education [2018AML05]
The homojunction induced by twin structure in semiconductors is found to be highly effective in decreasing the bulk recombination. Theoretical and experimental results have demonstrated the back to back potentials and directional diffusion that originate from the homojunction could facilitate the charge separation and transport of BiVO4 (BVO) single crystals. As expected, the resultant homojunction can lead to significantly enhanced photocatalytic activity. To eliminate the significant reduction of performance caused by solution mediated interface recombination on exposed fluorine-doped tin oxide (FTO), a strategy for improving substrate coverage by a new n-step method is applied. The BVO photoanode with preferable twin structure and high substrate coverage ratio reaches a photocurrent density of approximate to 3.1 mA cm(-2) at 1.23 V versus reversible hydrogen electrode (RHE) and exhibits over 1.35% half-cell solar-to-hydrogen conversion efficiency at 0.6 V versus RHE. This finding offers a new and effective way of fabricating twin structures to reduce bulk recombination of BVO photoanodes, which can also be applied to other semiconductors.
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