High Electroactive Material Loading on a Carbon Nanotube@3D Graphene Aerogel for High‐Performance Flexible All‐Solid‐State Asymmetric Supercapacitors |
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Authors: | Zhenghui Pan Meinan Liu Jie Yang Yongcai Qiu Wanfei Li Yan Xu Xinyi Zhang Yuegang Zhang |
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Affiliation: | 1. i‐Lab, Suzhou Institute of Nano‐Tech and Nano‐Bionics, Chinese Academy of Sciences, Suzhou, China;2. College of Environment and Energy, South China University of Technology, Guangzhou, China;3. Department of Physics, Tsinghua University, Beijing, China |
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Abstract: | Freestanding carbon‐based hybrids, specifically carbon nanotube@3D graphene (CNTs@3DG) hybrid, are of great interest in electrochemical energy storage. However, the large holes (about 400 µm) in the commonly used 3D graphene foams (3DGF) constitute as high as 90% of the electrode volume, resulting in a very low loading of electroactive materials that is electrically connected to the carbon, which makes it difficult for flexible supercapacitors to achieve high gravimetric and volumetric energy density. Here, a hierarchically porous carbon hybrid is fabricated by growing 1D CNTs on 3D graphene aerogel (CNTs@3DGA) using a facile one‐step chemical vapor deposition process. In this architecture, the 3DGA with ample interconnected micrometer‐sized pores (about 5 µm) dramatically enhances mass loading of electroactive materials comparing with 3DGF. An optimized all‐solid‐state asymmetric supercapacitor (AASC) based on MnO2@CNTs@3DGA and Ppy@CNTs@3DGA electrodes exhibits high volumetric energy density of 3.85 mW h cm?3 and superior long‐term cycle stability with 84.6% retention after 20 000 cycles, which are among the best reported for AASCs with both electrodes made of pseudocapacitive electroactive materials. |
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Keywords: | all‐solid‐state asymmetric supercapacitors carbon nanotube@3D graphene aerogels electroactive materials flexible electronic devices |
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