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Citation: WANG Xiao-Mei, HU Ji-Ming, ZHANG Jian-Qing, CAO Chu-Nan. Electrochemical Activity of IrO₂ Electrodes in Aqueous Solutions Containing 4-Chlorophenol[J]. Acta Physico-Chimica Sinica, ;2009, 25(09): 1725-1730. doi: 10.3866/PKU.WHXB20090803 shu

Electrochemical Activity of IrO₂ Electrodes in Aqueous Solutions Containing 4-Chlorophenol

1.
Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China

Received Date: 30 March 2009
Available Online: 9 June 2009

The effect of 4-chlorophenol (4-CP) on the electrochemical activity of Ti-based IrO2 electrodes in acidic aqueous solutions was investigated within the electrochemical window for 4-CP. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) measurements both indicated that the existence of 4-CP in solution resulted in the activation of the IrO2 electrode in the electrochemical window. However, the testing results at metallic Ir electrode showed that the electrode activity was inhibited by 4-CP because of its adsorption onto the metal surface. A possible mechanismis proposed based on the influence of 4-CP on the electrochemical activities of these two electrode materials. The activation of IrO2 is believed to be related to its ease of transition from lower-valent to higher-valent oxides in the electrochemical window. The later oxides can be chemically oxidized and can remove organic molecules that are adsorbed onto the oxide electrode surface.
- Electrochemical activity,
- IrO2 electrode,
- 4-Chlorophenol,
- Aqueous solution,
- Activation
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沈阳化工大学材料科学与工程学院沈阳 110142

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Electrochemical Activity of IrO2 Electrodes in Aqueous Solutions Containing 4-Chlorophenol

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通讯作者: 陈斌, bchen63@163.com

Electrochemical Activity of IrO₂ Electrodes in Aqueous Solutions Containing 4-Chlorophenol