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] School of Materials Science and Engineering, East China University of Science and Technology, Mei Long Road 130, Shanghai, 200237, China

年份：2013

卷号：68

起止页码：185

外文期刊名：Carbon

收录：EI(收录号：20144900282201)

语种：英文

外文关键词：Doping (additives) - Capacitance - Chemical activation - Porous materials - Electrolytes - Nitrogen - Potassium hydroxide - 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 m2 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 m2 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. ? 2013 Elsevier Ltd. All rights reserved.