Pb-Ag阳极涂层制备及其电催化析氧性能

摘要

In order to improve the oxygen evolution activity and decrease the overpotential of Pb-Ag anode in the hydro-metallurgical process, a series of Pb-Ag anodes with different coatings were prepared by electroplating technology at room temperature. The crystal structure and surface morphology of the coatings were characterized by XRD and SEM. Moreover, the electrochemistry performance of different coatings were analyzed by LSV.CV and EIS technology. The research results indicated that the addition of Mn2+ and Co3+ ions could enhance the dynamics of oxygen evolution. The effect of Mn2+ ions was higher than Co3+ ions. Simultaneous addition of both of Mn2+ and Co3+ had stronger oxygen evolution activity than separate addition of Mn2+ or Co3+. Therefore, the Pb-Ag anode with PbO2/MnO2/Co3O4 coating has the best oxygen evolution ability and the lowest anodic potential for oxygen evolution.%基于提升湿法冶金中Pb-Ag阳极析氧活性、降低析氧过电位的目的,通过电镀技术在室温条件下制备了一系列不同涂层的Pb-Ag阳极.采用X射线衍射和扫描电镜对涂层的晶体结构和表面形貌进行了表征.并运用线性扫描(LSV)、循环伏安(CV)和交流阻抗(EIS)技术分析比较了不同阳极涂层的电化学性质.研究表明,加入Mn2+、Co3+可促进阳极析氧反应的动力学过程,其中加入Mn2+的作用强于Go3+；同时加入Mn2+和Co3+的电极比单独加入Mn2+或Co3+离子的电极对析氧反应的促进更明显,说明具有双复合涂层( PbO2/MnO2/Co3O4)的铅基阳极最能有效促进氧气的析出,降低铅基阳极板的析氧电位.