標題: Evaluation on carbon nanocapsules for supercapacitors using a titanium cavity electrode
作者: Wu, Cheng-Yeou
Wu, Pu-Wei
Lin, Pang
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: Carbon nanocapsules;Electrical double layer capacitor;Cavity electrode;Carbon blacks;Electrochemical analysis
公開日期: 1-八月-2010
摘要: We synthesize carbon nanocapsules (CNCs) by a flame combustion method and evaluate their potential as the electrode material for electrochemical double layer capacitor using a titanium cavity electrode (TCE). Identical process is conducted on commercially available carbonaceous materials such as Vulcan XC72R, Black Pearl 2000 (BP2000), multi-walled carbon nanotubes (MWCNTs), and active carbon (AC1100) for comparison purposes. Images from Scanning electron microscope and Transmission electron microscope on the CNCs demonstrate irregular-shaped particles in average size of 10-20 nm with graphene layers on perimeter compassing a hollow core. Electrochemical characterizations including cyclic voltammetry (CV), current reversal chronopotentiometry (CRC), and impedance spectroscopy are carried out in 1N H(2)SO(4) to determine the specific capacitance and cycle life time. Among these samples, the BP2000 still delivers the highest specific capacitance in F g(-1) but the CNCs demonstrate the largest value in mu F cm(2). In addition, the CNCs exhibit impressive life time for 5000 cycles without notable degradation. Consistent results are obtained by CV, CRC, and impedance measurements, validating the TCE as a facile tool to perform reliable electrochemical evaluations. (C) 2010 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jpowsour.2010.02.053
http://hdl.handle.net/11536/32389
ISSN: 0378-7753
DOI: 10.1016/j.jpowsour.2010.02.053
期刊: JOURNAL OF POWER SOURCES
Volume: 195
Issue: 15
起始頁: 5122
結束頁: 5129
顯示於類別:期刊論文


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  1. 000277820500080.pdf