期刊
ADVANCED POWDER TECHNOLOGY
卷 30, 期 10, 页码 2211-2217出版社
ELSEVIER
DOI: 10.1016/j.apt.2019.07.001
关键词
Cellulose; Porous carbon; Dual-doping; Synthesis; Supercapacitor
资金
- National Natural Science Foundation of China [21875091, 51672114]
- Natural Science Foundation of Jiangsu province [BK20171295, BK20161357]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_2235]
The rational design and synthesis of porous carbons as supercapacitor electrodes have received tremendous attentions. In this study, a facile all-in-one pyrolysis strategy was developed for producing N and S co-doped porous carbon (NSC), by utilizing cellulose, the most abundant natural reproducible carbohydrate, as precursors. A binary aqueous solution consisting of 9.5% NaOH and 4.5% thiourea served as solvent, porogen and doping reagent, simultaneously. The dissolution and lyophilization procedures allowed a homogeneous mixture, thus achieving a superb activation and doping effects after the pyrolysis. The resultant NSC demonstrated a highly-developed porous texture with a specific surface area of 1588 m(2) g(-1) and appropriate heteroatom functionalities with N and S contents of 3.82% and 1.94%, respectively. For three-electrode system, NSC had a high specific capacitance of 288 F g(-1) at 0.5 A g(-1) in 6 M KOH electrolyte, which was comparable to or even better than many reported cellulose and cellulose derivatives based porous carbon electrodes. The as-assembled NSC//NSC symmetrical cell displayed excellent rate capability and durability, depicting a hopeful candidate for supercapacitors. (C) 2019 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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