Acta Phys. -Chim. Sin. ›› 2004, Vol. 20 ›› Issue (07): 740-744.doi: 10.3866/PKU.WHXB20040715

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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

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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