Prolonging lifetime of photogenerated carriers in WO3 nanowires by oxygen vacancies engineering for enhanced photoelectrocatalytic oxygen evolution reaction
Prolonging lifetime of photogenerated carriers in WO3 nanowires by oxygen vacancies engineering for enhanced photoelectrocatalytic oxygen evolution reaction
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DOI：
10.1063/5.0061973
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发表时间：
2021-09-06
影响因子：
4
通讯作者：
Yuan, Cailei
中科院分区：
文献类型：
--
作者：
Liu, Zeyu;Jiang, Zhenzhen;Yuan, Cailei
WO 3纳米线（NWs）具有无毒、成本低、稳定性好、光催化氧化能力强等优点，是光电化学（PEC）析氧反应（OER）的理想电催化剂。然而，一个重大的挑战是有限的不良导电性和快速复合率的光生载流子。本文报道了一种简便有效的方法合成具有高光电转换效率和稳定性的含氧空位的WO 3纳米线（Ov-WO 3纳米线）。光电性能测试表明，该器件在可见光下具有良好的捕光性能，并具有较长的光响应时间。电化学阻抗谱测量显示R-ct值降低，表示电导率提高，这应该是上级PEC OER性能的原因。我们的工作提供了一个策略，制造有效的水裂解电极，以帮助建立合理的设计原则，为未来的OER催化剂。
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.