npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Phys.: Sae Mulli 2021; 71: 340-346

Published online April 30, 2021 https://doi.org/10.3938/NPSM.71.340

Copyright © New Physics: Sae Mulli.

Nitrogen-doped Carbon Nanofiber for use in a Symmetric Supercapacitor

Gyawali GHANASHYAM1, Hae Kyung JEONG1,2*

1Department of Physics, Institute of Natural Sciences, Daegu University, Gyeongsan 38453 , Korea

2Department of Materials-Energy Science and Engineering, Institute of Industry and Technique, Daegu University, Gyeongsan 38453, Korea

Correspondence to:outron@gmail.com

Received: January 7, 2021; Revised: February 3, 2021; Accepted: February 17, 2021

Abstract

We synthesized nitrogen-doped carbon nanofiber for supercapacitor applications. Melamine is used as nitrogen source. 4 wt% of nitrogen is doped, and it consists of pyridinium, pyrrole, and quaternary nitrogen The electrochemical surface area increased from 0.28 $\mu$cm$^{2}$ to 0.40 $\mu$cm$^{2}$ due to the nitrogen doping, and the electrochemical impedance decreased from 249 to 63 $\Omega$ at 100 Hz. Finally, the specific capacitance was enhanced from 71 F/g to 192 F/g (at 0.5 A/g), which is almost three times higher, compared to the precursor carbon nanofiber. A high specific energy of 17 Wh/kg with a specific power of 200 W/kg was obtained from a symmetric supercapacitor device. Capacitance retention of 87% and coulombic efficiency of 81% after 3,000 cycles prove relatively good rate capability and cyclic stability.

Keywords: Carbon nanofiber, Nitrogen doping, Supercapacitor

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