期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 57, 期 8, 页码 2248-2252出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201712499
关键词
FeOOH; oxygen vacancies; photoelectrochemistry; solar water oxidation; ultrathin layers
资金
- National Natural Science Foundation of China [21622310, 21573264, 21603247, 21703266]
Photoelectrochemical (PEC) water splitting is a promising method for storing solar energy in the form of hydrogen fuel, but it is greatly hindered by the sluggish kinetics of the oxygen evolution reaction (OER). Herein, a facile solution impregnation method is developed for growing ultrathin (2 nm) highly crystalline beta-FeOOH nanolayers with abundant oxygen vacancies on BiVO4 photoanodes. These exhibited a remarkable photocurrent density of 4.3 mA cm(-2) at 1.23V (vs. reversible hydrogen electrode (RHE), AM 1.5G), which is approximately two times higher than that of amorphous FeOOH fabricated by electrodeposition. Systematic studies reveal that the excellent PEC activity should be attributed to their ultrathin crystalline structure and abundant oxygen vacancies, which could effectively facilitate the hole transport/trapping and provide more active sites for water oxidation.
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