Journal
CHEMICAL ENGINEERING JOURNAL
Volume 347, Issue -, Pages 233-242Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.04.116
Keywords
Porous carbon nanosheet; Protic salt; Dual-heteroatom self-doping; Self-template; Supercapacitor electrode
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Funding
- National Natural Science Foundation of China [21273162, 21473122, 21501135, 21505100, 51772216]
- Science and Technology Commission of Shanghai Municipality, China [14DZ2261100]
- Natural Foundation of Hubei Province of China [2014CFB782]
- Fundamental Research Funds for the Central Universities
- Large Equipment Test Foundation of Tongji University
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We develop a novel self- doped and self- template strategy to synthesize N, S doped porous carbon nanosheets (N/S- HCSs) by pre- carbonization and post- activation of a low- cost protic salt of p- phenylenediamine toluenesulfate ([pPD][2CH(3)PhSO(3)]). [pPD][2CH(3)PhSO(3)] is obtained by a simple neutralization reaction at room temperature and behaves as an all- in- one precursor, serving as C, N, S sources and a self- template. As- prepared N/S-HCSs possess large specific surface area and nanosheet geometry which provide enough adsorbing sites for charge accumulation and shorten diffusion distance of electrolyte ions at electrode/electrolyte interface. Besides, N/S-HCSs exhibit unique porous nanoarchitecture with uniform ultramicropores and a well- developed network of supermicropores and mesopores, which guarantees highly efficient ion- highways for electrolyte diffusion and transport. Furthermore, incorporated heteroatoms in the carbon framework structure improve the electrical conductivity and surface wettability, and provide extra pseudocapacitance. As a result, N/S-HCS electrode delivers superior electrochemical performance including high gravimetric capacitance (280 F g(-1) at 1.0 A g(-1)), good rate performance (134F g(-1) at 50 A g(-1)) and cycling stability (94.4% retention after 10,000 cycles at 2.0 A g(-1)) in 6M KOH electrolyte. The present innovative synthetic concept can be easily implemented, without
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