Heteroatom‐Doped Porous Carbon Nanosheets: General Preparation and Enhanced Capacitive Properties |
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| Authors: | Xiaodong Hao Jie Wang Bing Ding Laifa Shen Yunling Xu Ya Wang Zhi Chang Hui Dou Xiangjun Lu Prof Xiaogang Zhang |
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| Affiliation: | 1. Jiangsu Key Laboratory of Material and Technology for Energy Conversion, College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, P.R. China;2. School of Material Science and Engineering, Xiamen University of Technology, Xiamen, P.R. China |
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| Abstract: | High‐performance electrical double‐layer capacitors (EDLCs) require carbon electrode materials with high specific surface area, short ion‐diffusion pathways, and outstanding electrical conductivity. Herein, a general approach combing the molten‐salt method and chemical activation to prepare N‐doped carbon nanosheets with high surface area (654 m2 g?1) and adjustable porous structure is presented. Owing to their structural features, the N‐doped carbon nanosheets exhibited superior capacitive performance, demonstrated by a maximum capacitance of 243 F g?1 (area‐normalized capacitance up to 37 μF cm?2) at a current density of 0.5 A g?1 in aqueous electrolyte, high rate capability (179 F g?1 at 20 A g?1), and excellent cycle stability. This method provides a new route to prepare porous and heteroatom‐doped carbon nanosheets for high‐performance EDLCs, which could also be extended to other polymer precursors and even waste biomass. |
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| Keywords: | carbon doping molten-salt activation nanostructures supercapacitors |
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