Ti/Sb-SnO_2/PbO_2电极表面状态变化研究（英文）  

Surface Analysis of Ti/Sb-SnO_2/PbO_2 Electrode after Long Time Electrolysis

作　　者：徐浩[1] 延卫[1] 杨鸿辉[2] 

机构地区：[1]西安交通大学环境科学与工程系,陕西西安710049 [2]西安交通大学动力工程多项流国家重点实验室,陕西西安710049

出　　处：《稀有金属材料与工程》2015年第11期2637-2641,共5页Rare Metal Materials and Engineering

基　　金：China Postdoctoral Science Foundation(2013M532053);Postdoctoral Science Foundation of Shaanxi Province(0103-18420058);Fundamental Research Funds for the Central Universities of China

摘　　要：主要考察Ti/Sb-SnO_2/PbO_2电极在Na_2SO_4溶液中恒电流密度长时间电解后,其电极表面状态的变化情况。通过扫描电镜与元素分析来考察电极表面形貌变化及表面元素分布情况,通过X射线衍射来考察电极表面氧化物的晶型变化情况,通过电感耦合等离子体仪来检测电解液中金属元素的浓度变化。结果表明,在长时间电解后,PbO_2电极表面存在氧化物层溶蚀与脱落区域。在电解完成后的电解液中检测到Pb元素,表明电极表面存在Pb元素的溶解。X射线衍射表明电极表面仍然为PbO_2层,只是相应的衍射峰强度有所降低。由上述结果推测PbO_2电极失效的可能原因是:表层氧化物溶解、脱落以及基体的钝化。The surface morphology is significant on the stability of electrode.In this study,the surface morphology of a target electrode,Ti/Sb-SnO2/PbO2,was analyzed after long time electrolysis under constant current density conditions in Na2SO4 solution.SEM,EDS,XRD and ICP-OES were used to characterize the change of its surface morphology and the metal content in the electrolyte solution.The SEM images show that the dissolution and detachment phenomenon occur on the surface of Ti/Sb-SnO2/PbO2 electrode after long time electrolysis.Pb element is detected in the electrolytes after electrolysis,which uncovers the dissolution of PbO2.The XRD patterns indicate that the surface layer is still PbO2 but the intensity of diffraction peaks is decreased.It is speculated that the mechanisms of the Ti/Sb-SnO2/PbO2 electrode deactivation are the oxide layer dissolution,detachment and the substrate passivation.

关 键 词：二氧化铅 长时间电解 表面分析 电极失效 

分 类 号：O646.54[理学—物理化学]