光电流
光电化学
电解质
表面状态
析氧
化学
半导体
重组
化学工程
氧气
材料科学
钝化
纳米技术
化学物理
电化学
光电子学
电极
图层(电子)
曲面(拓扑)
物理化学
几何学
工程类
有机化学
基因
数学
生物化学
标识
DOI:10.1002/anie.202010908
摘要
Improving charge transport and reducing bulk/surface recombination can increase the activity and stability of BiVO4 for water oxidation. Herein we demonstrate that the photoelectrochemical (PEC) performance of BiVO4 can be significantly improved by potentiostatic photopolarization. The resulting cocatalyst-free BiVO4 photoanode exhibited a record-high photocurrent of 4.60 mA cm-2 at 1.23 VRHE with an outstanding onset potential of 0.23 VRHE in borate buffer without a sacrificial agent under AM 1.5G illumination. The most striking characteristic was a strong "self-healing" property of the photoanode, with photostability observed over 100 h under intermittent testing. The synergistic effects of the generated oxygen vacancies and the passivated surface states at the semiconductor-electrolyte interface as a result of potentiostatic photopolarization reduced the substantial carrier recombination and enhanced the water oxidation kinetics, further inhibiting photocorrosion.
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