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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Co3+;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。
A series of Pb-Ag anodes with different coatings were prepared by electroplating technology at room temperature based on the purpose of enhancing the oxygen evolution activity of Pb-Ag anode in hydrometallurgy and reducing the oxygen evolution overpotential. The crystal structure and surface morphology of the coating were characterized by X-ray diffraction and scanning electron microscopy. The electrochemical properties of different anode coatings were analyzed and compared using linear sweep (LSV), cyclic voltammetry (CV) and alternating current impedance (EIS) techniques. The results show that the addition of Mn2 + and Co3 + can promote the kinetic process of anodic oxygen evolution. The addition of Mn2 + is stronger than that of Co3 +. The addition of Mn2 + and Co3 + is more effective than the addition of Mn2 + or Co3 + Obviously, it shows that the lead-based anode with double composite coating (PbO2 / MnO2 / Co3O4) can effectively promote the precipitation of oxygen and reduce the oxygen evolution potential of the lead-based anode.