铱掺杂富氧空位电催化剂的制备及其析氧性能研究

Preparation of Ir-Doped W₁₈O₄₉ Electrocatalysts and Study of Its OER Properties

摘要: 开发先进的酸性析氧反应(OER)电催化剂是提升质子交换膜电解槽效率的关键，这对绿氢的制备具有重要意义。本文采用溶剂热法与高温煅烧的方式成功制备了铱(Ir)掺杂含有氧空位的三氧化钨(W₁₈O₄₉)催化剂Ir-doped W₁₈O₄₉。Ir的掺杂并没有改变W₁₈O₄₉的晶体结构。电化学测试结果表明：当加入的Ir为40mg时，Ir-doped W₁₈O₄₉具有优异OER性能：在0.5 m硫酸中，在10 mA cm⁻²的过电位307 mv，Tafel斜率为64.1 mV/dec和5.72 mF cm⁻²的双电层电容，并且在酸性环境下保持12小时的稳定性。本研究为酸性环境下析氧电催化剂的应用奠定了一定的理论和研究基础。

Abstract: The development of advanced acidic oxygen evolution reaction (OER) electrocatalyst is the key to improve the efficiency of proton exchange membrane electrolyzer, which is of great significance for the preparation of green hydrogen. Iridium doped tungsten trioxide (W₁₈O₄₉) catalysts containing oxygen vacancies were successfully prepared by solvothermal method and high temperature calcination. IR doping did not change the crystal structure of W₁₈O₄₉. The electrochemical test results show that: when the added IR is 40 mg, IR doped W₁₈O₄₉ has excellent OER performance: in 0.5 m sulfuric acid, the overpotential of 10 mA cm⁻² is 307 mv, the Tafel slope is 64.1 mv/dec and the double-layer capacitance of 5.72 MF cm⁻², and the stability is maintained for 12 hours in acid environment. This study laid a theoretical and research foundation for the application of oxygen evolution electrocatalyst in acidic environment.