IrO_2电极在含有机小分子水溶液中的电化学活性  

Electrochemical Activities of lrO_2 Electrodes in Small Organic Molecules Containing Aqueous Solutions

作　　者：胡吉明[1] 张鉴清[1] 张金涛[1] 曹楚南[1] 

机构地区：[1]浙江大学化学系,杭州310027

出　　处：《物理化学学报》2004年第7期740-744,共5页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划(G199990650)资助项目

摘　　要：通过循环伏安(CV)与电化学阻抗谱(EIS)测试研究了Ti基IrO2系活性涂层电极在含甲醇、甲酸及甲醛三种有机小分子的Na2SO4溶液中的电化学活性,其中以电极/溶液界面的双电层电容来表征电极的活性.结果表明,与同浓度H2SO4溶液相比,该电极在Na2SO4溶液中的电化学活性发生明显下降.有机小分子的加入降低了电极的活性表面积.发现有机物能在较宽的电位范围内发生氧化反应,但在该种电极上的电氧化速率较慢.然而,伴随着析氧反应的发生,有机物的氧化也随之加快.The electrochemical activities of Ti based IrO2 active coating electrodes in Na2SO4 aqueous solutions containing methanol, formic acid and formaldehyde, respectively, were investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The activity was quantitatively characterized by the double-layer capacitance, C-dl. The results showed that in comporison with that in H2SO4 electrolyte the electrode activity in Na2SO4 solution with the same concentration declines dramatically. The active surface area of the electrodes was also found to decrease in the presence of these small organic moleculars. It was found that the electrooxidation of organic compounds can take place in a wide potential region, but with a slow reaction rate. The organic oxidation is facilitated by the oxygen evolution on this type of electrode.

关 键 词：IrO2电极 甲醇 甲酸 甲醛 电化学活性 

分 类 号：O646.5[理学—物理化学]