太阳能燃料
原位
材料科学
生产(经济)
光电化学
燃料电池
纳米技术
光电子学
环境科学
化学工程
工程物理
催化作用
化学
电极
电化学
工程类
光催化
生物化学
宏观经济学
物理化学
经济
有机化学
作者
Zhiyuan Cao,Xianyin Song,Xin Chen,Xuefeng Sha,Jiachang Tang,Zhihai Yang,Yawei Lv,Changzhong Jiang
标识
DOI:10.1002/solr.202400523
摘要
BiVO 4 has been widely concerned due to its great potential in photoelectrochemical (PEC) water splitting. However, low carrier mobilities and high recombination efficiency of photogenerated carriers impede its photocatalytic performance. Herein, an in situ PEC cyclic‐voltammetry‐induced surface reconstruction of BiVO 4 photoanodes (BVO pristine) is developed with significantly enhanced efficiency for solar water splitting. A series of in situ characterizations (including in situ X‐ray diffraction, in situ Raman), together with electrochemical tests and density‐functional theory calculations, reveal that during the photoelectrical activation process, the BVO pristine surfaces undergo a crystal plane reconstruction with greatly increased {040} crystal face to promote the separation of photogenerated carriers. In addition, abundant vanadium vacancies and oxygen vacancies are also introduced into the BiVO 4 surface during the crystal face reconstruction process with more favorable surface water adsorption and increased injection efficiency of photogenerated carriers. Therefore, the charge‐transfer resistance ( R ct ) between BVO pristine and electrolyte under AM 1.5G illumination substantially reduced from the original 15 200 to 2820 Ω after the activation. Moreover, the photocurrent density of activated BVO pristines increases more than 12 times, relative to the original BiVO 4 . In this work, a new horizon for in situ photoelectric activation of semiconductor photoelectrodes with significantly enhanced PEC water splitting is provided.
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