Hierarchically Designed Three‐Dimensional Macro/Mesoporous Carbon Frameworks for Advanced Electrochemical Capacitance Storage |
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Authors: | Yanbing Yang Dr Peixu Li Shiting Wu Xinyang Li Enzheng Shi Qicang Shen Prof Dehai Wu Wenjing Xu Prof Anyuan Cao Prof Quan Yuan |
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Institution: | 1. Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072 (P.R. China);2. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871 (P.R. China);3. Aeronautical Manufacturing Technology Institute, Shanghai Aircraft Manufacturing Co., Ltd, Shanghai 200436 (P.R. China);4. Department of Mechanical Engineering, Tsinghua University, Beijing 100084 (P.R. China) |
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Abstract: | Mesoporous carbon (m‐C) has potential applications as porous electrodes for electrochemical energy storage, but its applications have been severely limited by the inherent fragility and low electrical conductivity. A rational strategy is presented to construct m‐C into hierarchical porous structures with high flexibility by using a carbon nanotube (CNT) sponge as a three‐dimensional template, and grafting Pt nanoparticles at the m‐C surface. This method involves several controllable steps including solution deposition of a mesoporous silica (m‐SiO2) layer onto CNTs, chemical vapor deposition of acetylene, and etching of m‐SiO2, resulting in a CNT@m‐C core–shell or a CNT@m‐C@Pt core–shell hybrid structure after Pt adsorption. The underlying CNT network provides a robust yet flexible support and a high electrical conductivity, whereas the m‐C provides large surface area, and the Pt nanoparticles improves interfacial electron and ion diffusion. Consequently, specific capacitances of 203 and 311 F g?1 have been achieved in these CNT@m‐C and CNT@m‐C@Pt sponges as supercapacitor electrodes, respectively, which can retain 96 % of original capacitance under large degree compression. |
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Keywords: | carbon nanoparticles nanotubes mesoporous materials platinum |
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