摘要
采用热分解和电沉积方法分别制备了Ti/SnO2-Sb2O3,Ti/PbO2和Ti/SnO2-Sb2O3/PbO2三种电极.电镜照片表明,与热分解制备的Ti/SnO2-Sb2O3电极表面呈“泥裂状”不同,电沉积Ti/PbO2电极表面呈典型金刚石型结构;Ti/SnO2-Sb2O3/PbO2电极的氧化物中间层使PbO2结晶显著减小,而且增加了镀层PbO2与钛基的结合力,在连续使用较长时间后电极表面出现“蜂窝状”腐蚀坑.EDAX和XRD分析表明,虽然电极用于电化学氧化对氯苯酚后表层物相没有发生改变,但其组成元素的含量有所变化.与Ti/SnO2-Sb2O3和Ti/PbO2电极相比,Ti/SnO2-Sb2O3/PbO2电极具有更高的电化学氧化性能.
The electrodes of Ti/SnO2-Sb2O3, Ti/PbO2 and Ti/SnO2-Sb2O3/PbO2 are prepared, respectively, by thermal decomposition and electrodeposition, which are characterized by spectral methods. SEM images show that, unlike to the ＂mud crack＂ surface of Ti/SnOE-Sb2O3 electrode made by thermal decomposition, the surface of Ti/PbO2 electrode made by electrodeposition appears diamond cubic structure. Moreover, the crystal size of PbO2 decreases markedly when an intermediate layer of Sn-Sb oxides exists between the layers of Ti substrate and PbO2. The honeycombed corrosion pits appear in the surface of Ti/SnO2-Sb2 O3/PbO2 electrode after electrolyzing 4-chlorophenol for a long period. EDAX and XRD analyses indicate that although the phase transformation of electrode surface does not occur, the contents of the main elements in the electrode surface change with the increase of electrolysis time. Experimental results show that the electrochemical activity of Ti/SnO2- SbEO3/PbO2 electrode is higher than that of the electrodes of Ti./SnOE-Sb203 and Ti/PbO2.
出处
《环境化学》
CAS
CSCD
北大核心
2006年第4期429-434,共6页
Environmental Chemistry
基金
教育部211工程学科项目基金
中国博士后科学基金(2005037032)资助
关键词
电极
氧化物涂层
对氯苯酚
电化学氧化
electrode, oxide coating, 4-chlorophenol, electrochemical oxidation.
