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Heteroatom‐Doped Porous Carbon Nanosheets: General Preparation and Enhanced Capacitive Properties
Author(s) -
Hao Xiaodong,
Wang Jie,
Ding Bing,
Shen Laifa,
Xu Yunling,
Wang Ya,
Chang Zhi,
Dou Hui,
Lu Xiangjun,
Zhang Xiaogang
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201602922
Subject(s) - heteroatom , materials science , supercapacitor , capacitance , electrolyte , chemical engineering , specific surface area , carbon fibers , capacitive deionization , conductivity , doping , aqueous solution , capacitive sensing , nanotechnology , electrode , electrochemistry , composite material , optoelectronics , organic chemistry , chemistry , catalysis , ring (chemistry) , composite number , computer science , engineering , operating system
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 m 2 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.