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Nitrogen-doped ordered mesoporous carbon using task-specific ionic liquid as a dopant for high-performance supercapacitors

Published online by Cambridge University Press:  05 January 2017

Jie Zhou*
Affiliation:
College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Li Bao
Affiliation:
College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Shengji Wu
Affiliation:
College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Wei Yang
Affiliation:
College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
Hui Wang
Affiliation:
College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
*
a) Address all correspondence to this author. e-mail: jane@hdu.edu.cn
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Abstract

Ordered mesoporous carbons (OMCs) are appealing alternatives to conventional porous activated carbon applied to electronic energy storage and conversion devices. Nitrogen-doped OMC (NOMC) was prepared with a soft-template strategy directly using task-specific ionic liquid with dicyanamide anion as the nitrogen dopant, and utilized as supercapacitors for the first time. Compared with pristine OMC, NOMC showed excellent electrochemical capacitive behavior in 6 M KOH electrolyte. NOMC possessed a high specific capacitance of 427 F/g at a current density of 1 A/g and exhibited a stable cycle life (almost 98% retained at a current density of 5 A/g after 2000 cycles). The outstanding capacitive performance of NOMC was ascribed to the synergetic effects of its bimodal mesoporous structure, large specific surface area (1919 m2/g), and nitrogen doping (3.52 wt%), which help to accelerate the ion diffusion, increase the surface charge storage, and intensify pseudo-capacitive reactions.

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Articles
Copyright
Copyright © Materials Research Society 2017 

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