【摘要】 为提升析氧电极催化性能及使用寿命，通过热解法制备了Co改性的Ti/IrO₂-Co₃O₄-SnO₂-Sb₂O₅四元氧化物电极。采用极化曲线（LSV）、循环伏安曲线（CV）、交流阻抗图谱（EIS）及加速寿命实验研究了电极在硫酸溶液中的析氧催化活性及稳定性。结果表明，随着Co摩尔分数的增大，涂层表面的粗糙度先降低后升高，而电极的析氧活性及加速寿命均先升高后降低；当Co摩尔分数为50%时电极催化活性最佳，而当Co摩尔分数为30%时电极寿命最长，与Ti/IrO₂-SnO₂-Sb₂O₅电极相比寿命提高了约76.7%。电化学测试结果表明，Co改性电极催化活性的提高得益于反应控速步骤的改变、涂层表面反应位点数量的增大及电化学反应阻抗的降低。更多还原

【Abstract】 In order to improve the catalytic performance and service life of oxygen evolution electrode, Co modified Ti/IrO₂-Co₃O₄-SnO₂-Sb₂O₅ quaternary oxides electrode is prepared by thermal decomposition method.The catalytic activity and stability of the electrode for oxygen evolution in sulfuric acid solution are studied by means of polarization curve（LSV）,cyclic voltammetry curve（CV）,AC impedance spectroscopy（EIS） and accelerated life test.It is shown from the results that with the increase of Co content, the surface roughness of the coating decreases firstly and increases then, while both the oxygen evolution activity and accelerated life of the electrode increase firstly and decreases then.The electrode obtains the best catalytic activity when the content of Co is 50 mol%.The electrode has the longest service life when the content of Co is 30 mol%.Compared with Ti/IrO₂-SnO₂-Sb₂O₅ electrode, its service life increases by about 76.7%.Electrochemical test results show that the higher catalytic activity of Co modified electrode benefits from the variation of reaction rate control step, the increase of the number of reactive sites on the coating surface and the drop of electrochemical reaction impedance.更多还原