Detrimental charge recombination at photoanode/electrolyte junctions severely impedes photoelectrochemical (PEC) performance. The deposition of cobalt phosphate (CoPi) onto photoanodes is an efficient approach to achieve high PEC efficiency. However, achieving performances at the required remains a huge challenge, owing to the passivation effect of CoPi. In this study, function‐tunable strategy, whereby the passivation role is switched with the activation role, is exploited to modulate PEC performance through simultaneous activation of interface charge transfer and surface catalysis. By depositing nickel‐doped CoPi onto a BiVO₄ (BV) substrate, the integrated system (BV/Ni₁Co₇Pi) exhibits a remarkable photocurrent density (4.15 mA cm⁻²), which is a 4.6‐fold increase relative to BV (0.90 mA cm⁻²). Moreover, the satisfactory performance can be also achieved on α‐Fe₂O₃ photoanode. These findings provide guidance for improving the efficiency of CoPi on photoanodes for PEC water oxidation.

中文翻译：

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通过调节电荷转移和氧气释放效率，在掺镍磷酸钴上增强光电化学水分解

光阳极/电解质接合处的有害电荷复合严重阻碍了光电化学（PEC）性能。将磷酸钴（CoPi）沉积到光阳极上是实现高PEC效率的有效方法。但是，由于CoPi的钝化效果，要达到所需的性能仍然是一个巨大的挑战。在这项研究中，利用功能可调策略，通过同时激活界面电荷转移和表面催化，来钝化角色与激活角色切换，从而调节PEC性能。通过将掺镍的CoPi沉积到BiVO ₄（BV）衬底上，集成系统（BV / Ni ₁ Co ₇ Pi）表现出显着的光电流密度（4.15 mA cm ^-2）），相对于BV（0.90 mA cm ^-2）增加了4.6倍。此外，令人满意的性能也可以在的α-Fe实现₂ ö ₃光电阳极。这些发现为提高CoPi在PEC水氧化的光阳极上的效率提供了指导。