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Acta Physico-Chimica Sinica  2004, Vol. 20 Issue (07): 740-744    DOI: 10.3866/PKU.WHXB20040715
Article     
Electrochemical Activities of IrO2 Electrodes in Small Organic Molecules Containing Aqueous Solutions
Hu Ji-Ming;Zhang Jian-Qing;Zhang Jin-Tao;Cao Chu-Nan
Department of Chemistry, Zhejiang University, Hangzhou 310027;State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
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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 wordsIrO2 electrode      Methanol      Formic acid      Formaldehyde       Electrochemical activity     
Received: 06 January 2004      Published: 15 July 2004
Corresponding Authors: Hu Ji-Ming     E-mail: kejmhu@zju.edu.cn
Cite this article:

Hu Ji-Ming;Zhang Jian-Qing;Zhang Jin-Tao;Cao Chu-Nan. Electrochemical Activities of IrO2 Electrodes in Small Organic Molecules Containing Aqueous Solutions. Acta Physico-Chimica Sinica, 2004, 20(07): 740-744.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB20040715     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2004/V20/I07/740

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