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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 changes of electrode surface state of Ti / Sb-SnO_2 / PbO_2 electrode after prolonged electrolysis at constant current density in Na_2SO_4 solution were investigated. Scanning electron microscopy and elemental analysis were used to investigate the morphologies of the electrode surface and the distribution of the surface elements. X-ray diffraction was used to investigate the crystal form of the oxide on the surface of the electrode. The concentration of metal elements in the electrolyte was measured by inductively coupled plasma Variety. The results show that there is oxide layer erosion and detachment on the surface of PbO_2 electrode after long time electrolysis. The Pb element was detected in the electrolyte after the electrolysis was completed, indicating that the Pb element was dissolved on the electrode surface. X-ray diffraction shows that the electrode surface is still PbO_2 layer, only the corresponding diffraction peak intensity is reduced. From the above results speculated that PbO_2 electrode failure may be due to: the surface oxide dissolution, loss and matrix passivation.