物理化学学报 >> 2004, Vol. 20 >> Issue (07): 740-744.doi: 10.3866/PKU.WHXB20040715

研究论文 上一篇    下一篇

IrO2电极在含有机小分子水溶液中的电化学活性

胡吉明;张鉴清;张金涛;曹楚南   

  1. 浙江大学化学系,杭州 310027;中国科学院金属研究所,金属腐蚀与防护国家重点实验室,沈阳 110016
  • 收稿日期:2004-01-06 修回日期:2004-03-19 发布日期:2004-07-15
  • 通讯作者: 胡吉明 E-mail:kejmhu@zju.edu.cn

Electrochemical Activities of IrO2 Electrodes in Small Organic Molecules Containing Aqueous Solutions

Hu Ji-Ming;Zhang Jian-Qing;Zhang Jin-Tao;Cao Chu-Nan   

  1. Department of Chemistry, Zhejiang University, Hangzhou 310027;State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
  • Received:2004-01-06 Revised:2004-03-19 Published:2004-07-15
  • Contact: Hu Ji-Ming E-mail:kejmhu@zju.edu.cn

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.

关键词: IrO2电极, 甲醇, 甲酸, 甲醛, 电化学活性

Abstract: 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,Cdl. 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.

Key words: IrO2 electrode, Methanol, Formic acid, Formaldehyde,  Electrochemical activity