金属氧化物电极的制备及其电化学性能的研究

THE PREPARATION OF METAL OXIDE ELECTRODE AND ITS ELECTROCHEMICAL PERFORMANCE

以热分解法制备了Ti/SnO2和Ti/Sb-SnO2电极,并采用X射线衍射仪、扫描电子显微镜和阳极析氧极化曲线分别对所制备的电极进行了表征,并以苯酚为目标污染物,考察了2种电极的电催化氧化性能和电极使用寿命。结果表明,Sb对表面涂层的结构形貌和催化活性均有影响,其中Ti/Sb-SnO2电极析氧电位最高,对苯酚的去除率可达98.9%,COD去除率可达75%左右,且具有较长的电极使用寿命和较低的槽电压;2种电极对苯酚降解反应均遵循1级反应动力学规律,且反应机理为·OH参与的间接电氧化过程。

Ti/SnO2 and Ti/Sb-SnO2 electrodes were prepared by using thermal decomposition method. XRD, SEM and LSV were used to characterize the electrodes. With phenol as the target pollutant, the electric catalytic oxidation properties and the service life of the two kinds of electrodes were investigated. The results show that the surface structure morphology and catalytic activity of the electrode were both affected by Sb. Where Ti/Sb-SnO2 electrode has the highest oxygen evolution potential, phenol and COD removal rates were 98.9% and 75%. In addition, Ti/Sb-SnO2 electrode has a longer life and lower electrode cell voltage. The two electrodes on phenol degradation reaction kinetics follows the first order reaction, and the reaction mechanism is .OH involved in indirect electrochemical oxidation process.