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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received October 19, 2007
Accepted October 20, 2007

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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나노탄소섬유/MnO2 복합전극의 초고용량 캐폐시터 특성

Supercapacitive Properties of Carbon-Nano Fiber/MnO2 Composite Electrode

이병준 윤여일 고장면^†

Byung Jun Lee Yu Il Yoon Jang Myoun Ko^†

한밭대학교 응용화학생명공학부, 305-719 대전시 유성구 덕명동 산16-1

Division of Applied Chemistry and Biotechnology, Hanbat National University, San 16-1, Dukmyung-dong, Yusong-gu, Daejon 305-719, Korea

jmko@hanbat.ac.kr

Korean Chemical Engineering Research, February 2008, 46(1), 94-98(5), NONE Epub 28 February 2008

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Abstract

비정형 MnO2의 초고용량 캐폐시턴스 특성을 향상시키기 위하여 망간산화물을 높은 전기전도를 갖는 나노탄소섬유 (vapour-grown carbon nanofibers, VGCF)와 복합화하여 나노탄소섬유/망간 산화물(VGCF(40 wt%)/MnO2) 복합 전극을 제조하여 cyclic voltammetry(CV), impedance spectroscopy 및 chronopotentiometric charge/discharge 기법을 사용하여 1.0M Na2SO4 전해질에서 초고용량 캐폐시터 특성을 조사하였다. 40 wt% VGCF를 포함한 복합전극에서 0.8 mg/cm2 망간산화물을 로딩한 VGCF/MnO2 복합전극은 주사속도 20 mV/s에서는 380 F/g, 500 mV/s에서는 230 F/g의 비용량 값을 나타냈다. 또한, 2.0 mA/cm2의 일정전류로 충방전 실험을 수행한 결과 3,000회에서 97%의 초기용량을 유지하였다.

In order to improve the specific capacitance of amorphous hydrous manganese oxide (MnO2) for supercapacitors, it is made into composites with vapour-grown carbon nanofibers (VGCF) having the VGCF ratio as 40 wt% in the composites. The electrochemical properties of these composites are investigated in 1.0 M Na2SO4 by cyclic voltammetry (CV), impedance measurements and chronopotentiometric charger/discharger. The composite with 40 wt% VGCF shows the superior electrochemical performance, whose specific capacitance (based on the mass of MnO2, 0.8 mg/cm2) is 380 F/g at 20 mV/s and 230 F/g at 500 mV/s. Also, the cycle-life testing of this electrode carried out for 3,000 charge/discharge cycles at 2.0 mA/cm2 shows 97% capacitance retention.

Keywords

Supercapacitor Metal Oxides Composite Electrode Carbon Nanofiber Capacitance

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