钛基IrSiCe复合电极的制备及在电沉积钴中的应用

Preparation of Ti-based IrSiCe composite oxide anode and its electrocatalytic performance

摘要:

采用热分解法制备Ti/IrO2-SiO2及Ti/IrO2-SiO2-CeO2复合氧化物阳极。采用SEM分析对比掺入CeO2前后电极表面形貌的变化，采用循环伏安曲线及析氧极化曲线将自制Ir-Si-Ce电极与自制Ir-Si电极及商品电极（Ir-Ta-Sn、Ir-Ru、Ir-Ta、Ir-Sn）进行分析对比。采用双膜三室电沉积法从氯化钴溶液中回收钴，探讨自制电极与商品电极槽电压、能耗及抑氯性能优劣。结果表明：掺杂稀土Ce有利于提高电极表面粗糙度、增大其活性表面积、提高其电催化活性；相比于Ir-Si、Ir-Ru、Ir-Sn、Ir-Ta、Ir-Ta-Sn电极，Ir-Si-Ce电极析氧电位最低、电催化活性最高；电沉积回收钴实验中，相比于其它电极，Ir-Si-Ce电极槽电压及能耗最低、抑氯性能最好，氯气削减率高达97.5%。

Abstract:

The Ti/IrO2-SiO2 and Ti/IrO2-SiO2-CeO2 composite oxide anodes were prepared by thermal decomposition method. The apparent morphology of the electrode was characterized by SEM. The cyclic voltammetry curve and oxygen evolution polarization curve were used to characterize the electrocatalytic performance of self-made electrodes and commercial electrodes（Ir-Ru、Ir-Sn、Ir-Ta、Ir-Ta-Sn）. The cobalt was recovered from the cobalt chloride solution by a double-membrane three-compartment electrolytic reactor. The advantages and disadvantages of cell voltage, power consumption and chlorine inhibition performance of self-made electrodes and commercial electrodes were discussed. The results show that the doping of rare earth Ce is beneficial to improve the surface roughness, active surface area and electrocatalytic activity of the electrode. Compared with Ir-Si, Ir-Ru, Ir-Sn, Ir-Ta and Ir-Ta-Sn electrodes, the Ir-Si-Ce electrode has the lowest oxygen evolution potential and the highest electrocatalytic activity. In the experiment of recovering cobalt by electrodeposition method, the Ir-Si-Ce electrode cell has the lowest voltage and energy consumption and the best chlorine inhibition performance compared with other electrodes. The chlorine reduction rate of it is as high as 97.5%.