Citation: FAN Xin-Zhuang, LU Yong-Hong, KONG Xiang-Feng, XU Hai-Bo, WANG Jia. Pseudo-Capacitive and Electrocatalytic Properties of Electrochemically Modified Graphite Electrode in Different Solutions[J]. Acta Physico-Chimica Sinica, ;2011, 27(04): 887-892. doi: 10.3866/PKU.WHXB20110426 shu

Pseudo-Capacitive and Electrocatalytic Properties of Electrochemically Modified Graphite Electrode in Different Solutions

1.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, Shandong Province, P. R. China

Received Date: 19 November 2010
Available Online: 11 March 2011
Fund Project: 山东省博士基金(BS2010NJ018) (BS2010NJ018)中国海洋大学专项基金(201022006)资助项目 (201022006)

A graphite electrode (GE) was electrochemically modified by recurrent galvanic pulses. The pseudo-capacitive behavior in acidic and neutral solutions and the electrocatalytic property in HCl and HNO₃ solutions of the modified graphite electrode (MGE) were evaluated by cyclic voltammetry (CV). We found that the MGE exhibited a considerable pseudo-capacitance (the specific capacitance was high up to 1.730 F·cm^-2) in H₂SO₄ solution and excellent pseudo-capacitive behavior was obtained in HCl solution as well except for a narrow potential window. This was due to the excellent electrocatalytic activity of the MGE toward the chlorine evolution reaction (the onset potential of chlorine evolution was negatively shifted 238 mV). However, the MGE showed no pseudo-capacitive behavior in HNO₃ solution but did show electrocatalytic activity toward the reduction of nitric acid. Compared with the pseudo-capacitive behavior in acidic solutions, the potential window of the MGE in neutral solution was substantially broadened and its energy density improved greatly eventually even though the corresponding peak current density decreased.
- Graphite,
- Electrochemical modification,
- Pseudo-capacitance,
- Chlorine evolution,
- Reduction of nitric acid
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沈阳化工大学材料科学与工程学院沈阳 110142