A Facile Approach To Improve Electrochemical Capacitance of Carbons by in Situ Electrochemical Oxidation
- Yuan WangYuan WangState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, P. R. ChinaMore by Yuan Wang,
- Zheng ChangZheng ChangState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaMore by Zheng Chang,
- Zhichao ZhangZhichao ZhangDepartment of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United StatesMore by Zhichao Zhang,
- Jie LinJie LinState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, P. R. ChinaMore by Jie Lin,
- Meng QianMeng QianState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, P. R. ChinaMore by Meng Qian,
- Peng WangPeng WangState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaUniversity of Chinese Academy of Sciences, Beijing 100049, P. R. ChinaMore by Peng Wang,
- Tianquan Lin*Tianquan Lin*E-mail: [email protected] (T.L.).State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaDepartment of Materials Science and Engineering, Massachusetts Institute of Technology, Massachusetts 02139, United StatesMore by Tianquan Lin, and
- Fuqiang Huang*Fuqiang Huang*E-mail: [email protected] (F.H.).State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaState Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaSuzhou Research Institute, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 6 Liangfu Road, Taicang 215400, Jiangsu, P. R. ChinaMore by Fuqiang Huang
Abstract
A facile approach of in situ electrochemical oxidation has been utilized to modify carbons, including activated carbon, mesoporous few-layer carbon, graphite, carbon fiber, and carbon nanotube, which induces oxygen-containing functional groups on its surface and simultaneously enhances its wettability, contributing to the improvement of capacitance. By this approach, the capacitance of commercialized activated carbon is increased by 86% in an acidic electrolyte, reaching 320 F g–1, of which more than 96% was maintained after 10 000 cyclic tests. The huge improvement stems from electrochemical redox reactions enabled by oxygen-associated groups, which do not adversely affect the porous structure and electrical conductivity. Such improvement will put carbon-based electrochemical capacitors into more practical application areas.
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