Performance of Ti--base SnO$_{2}$ electrode with an inter layer containing Mn element
含Mn中间层钛基二氧化锡电催化电极的性能

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.