文献类型：期刊文献

英文题名：Nitrogen-doped porous carbons through KOH activation with superior performance in supercapacitors

作者：Zhou, Min[1];Pu, Fan[1];Wang, Zhao[1];Guan, Shiyou[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China

年份：2014

卷号：68

起止页码：185

外文期刊名：CARBON

收录：;EI(收录号：20140217178269);WOS:【SCI-EXPANDED(收录号:WOS:000330814200018)】；

基金：The authors are grateful for the financial support from National Natural Science Foundation of China (No. 21274043)

语种：英文

外文关键词：Chemical activation - Doping (additives) - Potassium hydroxide - Electrolytes - Capacitance - Nitrogen - Porous materials - Supercapacitor

摘要：A series of nitrogen-doped porous carbons are prepared through KOH activation of a nonporous nitrogen-enriched carbon which is synthesized by pyrolysis of the polymerized ethylenediamine and carbon tetrachloride. The porosity and nitrogen content of the nitrogen-doped porous carbons depend strongly on the weight ratio of KOH/carbon. As the weight ratio of KOH/carbon increases from 0.5 to 2, the specific surface area increases from 521 to 1913 m(2) g(-1), while the nitrogen content decreases from 10.8 to 1.1 wt.%. The nitrogen-doped porous carbon prepared with a moderate KOH/carbon weight ratio of 1, which possesses a balanced specific surface area (1463 m(2) g(-1)) and nitrogen content (3.3 wt.%), exhibits the largest specific capacitance of 363 F g(-1) at a current density of 0.1 A g(-1) in 1 M H2SO4 aqueous electrolyte, attributed to the co-contribution of double-layer capacitance and pseudocapacitance. Moreover, it shows excellent rate capability (182 F g(-1) remained at 20 A g(-1)) and good cycling stability (97% capacitance retention over 5000 cycles), making it a promising electrode material for supercapacitors. (C) 2013 Elsevier Ltd. All rights reserved.