摘要
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.
Taking titanium as the base metal, a kind of tin dioxide catalytic electrode with an interlayer containing Mn (Ti/Mn/SnO2) was prepared by pyrolysis. The electrocatalytic 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 electrocatalytic activity of the electrode was decreased, the working voltages of Ti/Mn/SnO2 electrode were highly stabilized as compared with that of Ti/SnO2 electrode without Mn interlayer. It implies that the interlayer 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 SnO2 electrode surface, and hence change the electrode performance.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2005年第1期47-53,共7页
Chinese Journal of Materials Research
基金
国家自然科学基金50278022资助项目~~
关键词
无机非金属材料
SnO2电极
中间层
苯酚
Catalysis
Electrodes
Manganese
Nonmetallic materials
Oxidation
Phenols
Pyrolysis
Tin compounds
Titanium
