期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 114, 期 2-3, 页码 837-841出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2008.10.047
关键词
Activated carbon nanotube; Manganese oxide; Supercapacitor; Charge-discharge
资金
- Ministry of Knowledge Economy in Koreathrough Advanced Material on Technology(AMOTECH).
- Korea Technology & Information Promotion Agency for SMEs (TIPA) [00014824] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Multi-walled carbon nanotubes (CNTs)were chemically activated using KOH in order to improve their specific surface area, electrical conductivity, and specific capacitance. Using such an activated CNT (A-CNT), a composite of MnO2/A-CNT was prepared by the coprecipitation method, and its physical and electrochemical properties were evaluated for use as an electrode material in supercapacitors. For comparison, a composite of MnO2/CNT was also prepared using an inactivated CNT and characterized in an aqueous solution of 1.0 M Na2SO4. The specific capacitances of the MnO2/A-CNT composite electrode, measured using cyclic voltammetry at scan rates of 10 and 100 mV s(-1), were found to be 250 and 184 Fg(-1), respectively, compared to 215 and 138 Fg(-1), respectively, for the MnO2/CNT composite electrode. Because of CNT activation, the MnO2/A-CNT composite electrode showed an improved performance in both the capacitance and cycle performance, due to the alleviation of the accumulated stress during charge-discharge cycling. (C) 2008 Elsevier B.V. All rights reserved.
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