含Mn中间层钛基二氧化锡电催化电极的性能

采用高温热氧化方法制备了含Mn中间层的钛基二氧化锡电催化电极Ti/Mn/SnO2.采用SEM、EDX以及XPS等检测方法对电极表面涂层的形貌、元素组成及元素化学态进行了分析,研究了所制备Ti/Mn/SnO2电极电催化氧化降解苯酚的性能.结果表明,Mn中间层的引入降低了电极对苯酚的电催化降解活性,使电极的使用稳定性大为提高.含Mn中间层的存在,可防止电化学反应过程中析出的氧向基体的扩散,离子对Mn2 /Mn4 与Sn2 /Sn4 的存在改变了SnO2电极表面催化剂的组成和结构,导致电极性能变化.

Performance of Ti--base SnO$_{2}$ electrode with an inter layer containing Mn element

Taking titanium as the base metal, a kind of tin dioxide catalytic electrode with an inter-layer containing Mn(Ti/Mn/SnO2) was prepared by pyrolysis. The electro-catalytic oxidation characteristics of prepared electrode were investigated by selecting phenol as model substrate. The micrographs, the element composition of different layers, and the chemical environment of elements on the electrode surface were analyzed by SEM, EDX and XPS. Although the electro-catalytic activity of the electrode was decreased, the working voltages of Ti/Mn/SnCO2 electrode were highly stabilized compared with that of Ti/SnCO2 electrode without Mn inter-layer. It implies that the inter-layer might hold up the oxygen atom transfer process from electrode surface to Ti base metal, and this could then extend service life of the electrode. The redox couples of Mn2+/Mn4+ and Sn2+/Sn4+ influence the composition and the crystal structure on SnCO2 electrode surface, and hence change the electrode performance.