Preparation of an electrochemically modified graphite electrode and its electrochemical performance for pseudo-capacitors in a sulfuric acid electrolyte |
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Authors: | Haibo Xu Xinzhuang Fan Yonghong Lu Lian Zhong Xiangfeng Kong Jia Wang |
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Affiliation: | 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, PR China |
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Abstract: | A graphite electrode was activated using recurrent electrochemical galvanic pulses. After activation, the original smooth surface was changed into an obviously porous, rough surface with microcrystalline flake structures with a larger number of O-containing functional groups. The material had a high capacitance and a satisfactory high-rate performance. The superior volumetric capacitance in active layer was ca. 428 F cm−3. Eighty-eight percentage of the capacitance remained after the discharge current increased from 2 mA (1.71 F cm−2) to 100 mA (1.50 F cm−2) in 2.3 M H2SO4. |
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