Oxygen vacancies activating surface reactivity to favor charge separation and transfer in nanoporous BiVO4 photoanodes
Oxygen vacancies activating surface reactivity to favor charge separation and transfer in nanoporous BiVO4 photoanodes
复制标题
氧空位激活表面反应性，有利于纳米多孔 BiVO4 光阳极中的电荷分离和转移
DOI：
10.1016/j.apcatb.2020.119477
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发表时间：
2021-02-01
影响因子：
22.1
通讯作者：
Yin, Zongyou
中科院分区：
文献类型：
--
作者：
Jin, Sen;Ma, Xiaoxue;Yin, Zongyou
大多数半导体表面的催化反应活性较低是光电化学电极发展的一个常见障碍。负载共催化剂成为一种可行的方案，但由于复杂的界面问题，在与半导体集成方面仍然具有挑战性。本文介绍了一种可行的激活表面反应性的策略，替代共催化，与半导体光活性合作来提高PEC性能。我们将电离氩等离子体技术应用于三维（3D）纳米多孔BiVO4 （BVO）上，以可控地产生表面氧空位，从而实现表面活化，有利于电荷分离和水氧化反应（WOR）的转移。在am1.5 G光照下，在1.23 V条件下，相对于可逆氢电极（RHE），获得了4.32 mA cm（-2）的光电流密度，这在已报道的单BVO光阳极中是一个记录，甚至超过了大多数共催化剂辅助光阳极的性能。该研究为半导体光电极上缓慢的催化动力学提供了另一种解决方案，从而为调节PEC技术中光活性的合作开辟了一条新的途径。
The sluggish catalytic reactivity on the surface of most semiconductors is a common obstacle in developing photo-electrochemical (PEC) electrodes. Loading cocatalysts becomes a plausible scenario but remains chal-lenging in the integration with semiconductors due to the complicated interfacial issues. This work introduces an feasible strategy of activating surface reactivity, alternative to cocatalysis, in cooperating with semiconductor photoactivity to boost PEC performance. We apply an ionized argon plasma technology on three-dimensional (3D) nanoporous BiVO4 (BVO) to controllably generate surface oxygen vacancies, which enable surface activation favoring charge separation and transfer towards water oxidation reaction (WOR). A remarkable photo current density of 4.32 mA cm(-2) is achieved at 1.23 V versus reversible hydrogen electrode (RHE) under AM 1.5 G illumination, which is a record among the reported single BVO photoanodes and even surpasses the performances of most cocatalyst-assisted ones. This study provides an alternative solution to sluggish catalytic kinetics on semiconductor photoelectrodes, thus paving a novel avenue to modulate cooperation with photo activity in PEC technology.