WO₃ nanowires (NWs) have emerged as a promising alternative electrocatalyst for the photoelectrochemical (PEC) oxygen evolution reaction (OER), due to their nontoxicity, low cost, good stability, and strong photocatalytic oxidation ability. However, a significant challenge is limited by the poor electrical conductivity and the rapid recombination rate of photogenerated carriers. This paper reports a facile and effective way to synthesize the WO₃ NWs with oxygen vacancies (Ov-WO₃ NWs), which have high PEC OER activity and good stability. Photoelectric measurements indicate that the Ov-WO₃ NW-based device shows a good light-harvesting property under visible light and a prolonged photoresponse time. Electrochemical impedance spectra measurements reveal a reduced value of R_ct denoting an improved electrical conductivity, which should be responsible for the superior PEC OER performance. Our work provides a strategy for fabricating efficient water-splitting electrodes to help establish rational design principles for future OER catalysts.

中文翻译：

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通过氧空位工程延长WO3纳米线中光生载流子的寿命以增强光电催化析氧反应

WO ₃纳米线（NWs）由于其无毒、成本低、稳定性好和光催化氧化能力强，已成为光电化学（PEC）析氧反应（OER）的一种有前途的替代电催化剂。然而，一个重大挑战受限于较差的导电性和光生载流子的快速复合率。本文报道了一种合成具有氧空位的 WO ₃纳米线（Ov-WO ₃纳米线）的简便有效的方法，其具有高 PEC OER 活性和良好的稳定性。光电测量表明，Ov-WO ₃基于 NW 的器件在可见光下表现出良好的光捕获特性和延长的光响应时间。电化学阻抗谱测量显示 R _ct值降低，表明电导率提高，这应该是 PEC OER 性能优异的原因。我们的工作提供了一种制造高效水分解电极的策略，以帮助为未来的 OER 催化剂建立合理的设计原则。