Ce含量对Ti/IrO2-SiO2-CeO2电极电催化性能的影响

Effect of Ce Content on Electrocatalytic Performance of Ti/IrO2-SiO2-CeO2 Electrode

为降低析氧电位,改善电极表面形貌,制备电催化性能良好的Ti基IrSi电极,在煅烧温度为450℃条件下,采用热分解法制备了不同Ce含量的Ti/IrO2+SiO2+CeO2氧化物电极,采用SEM对电极的表观形貌进行表征,采用循环伏安曲线、析氧极化曲线及交流阻抗图谱对电极的电催化性能进行表征。结果表明,添加适量Ce可使晶粒分散均匀,裂纹数目增多,电极表面变得平坦、致密、均匀,同时析氧电位降低,孔隙率增加,电催化活性大大提高。但过量Ce又会对电极电催化性能产生不利影响,Ce含量达到10%时,裂纹数量最多且分布均匀,涂层形貌良好,析氧电位达到最低,为1.23V,电催化性能达到最佳。

In order to reduce the oxygen evolution potential and improve the electrode surface morphology and electrochemical performance,a Ti/IrO2+SiO2+CeO2 oxide electrode with good electrocatalytic performance was prepared.Ti/IrO2+SiO2+CeO2 with different Ce content was prepared by thermal decomposition at a calcination temperature of 450℃.The electrocatalytic properties of the electrode were characterized by cyclic voltammetry curve,oxygen evolution polarization curve,and AC impedance spectrum.The results show that by adding an appropriate amount of Ce,the crystal grains are uniformly dispersed,the number of cracks increase,and the surface of the electrode becomes flat,dense,and uniform.At the same time,the oxygen evolution potential decreases,the porosity increases,and the electrocatalytic activity is greatly improved.However,excessive Ce will adversely affect the electrocatalytic performance of the electrode.When the Ce content reaches 10%,the number of cracks is the largest and the distribution of cracks is uniform,the coating morphology and electrocatalytic performance are optimal,the oxygen evolution potential reaches a minimum of 1.23 V,and the electrode has the best electrocatalytic performance.