【作者】 张丽娟； 夏定国；

【Author】 ZHANG Li-juan, XIA Ding-guo (College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100022, China)

【机构】 北京工业大学环境与能源工程学院；

【摘要】 采用3种方法对聚丙烯晴基的石墨毡进行了表面处理,并用稀土离子La3+对石墨毡电极表面进行了修饰;通过循环伏安法研究了经化学处理后石墨毡电极对V(Ⅳ)/V(V)的电催化作用;采用扫描电镜观察了处理前后石墨毡的微观组织形态。结果表明:经酸处理和用稀土离子La3+修饰后的石墨毡电极电催化性能增强;稀土元素具有一定的储氧能力,可以和含氧分子形成较稳定的配合物,可能是电极表面修饰稀土离子La3+性能提高的原因之一。更多还原

【Abstract】 Graphite felt was treated by three kinds of methods and then metallized by ion-exchange with solution containing rare earth ion of La3+. Cyclic voltammetry method was used to investigate the electrochemical activity of graphite felt electrode and the surface morphology was studied by scanning electron microscopy (SEM). The cyclic voltammetry of the modified electrode in an acidic vanadium sulphate solution shows that the electrode modified by La3+ exhibits better electrochemical behavior than non-modified electrode. Rare earth elements can store up oxygen which may explain the supper electrochemical activity of modified electrode.更多还原