期刊
CARBON
卷 44, 期 15, 页码 3218-3225出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2006.06.031
关键词
activated carbon; carbon fibers; chemisorption; electrochemical properties; porosity
Activated carbon fibers are known to contain pores with a small resistance for electrolyte migration while possessing a large electrical resistance between the fibers. A carbon powder derived from pulverization of PAN-based carbon fibers was examined as an electrode for electric double layer capacitors using H2SO4 as the electrolyte solution. The performance of conventional-type activated carbon powders derived from phenol-formaldehyde resin char was also measured for comparison. The fiber-derived carbon exhibited an electrical resistance comparable to that of the conventional carbons while showed a larger specific capacitance as well as a lesser extent of capacitance decrease at high currents due to a smaller pore resistance. An ultimate capacitance as high as 290 F g(-1) can be reached for this fiber-derived carbon powder (with a BET surface area of approximate to 1300 m(2) g(-1)). This large capacitance value was suggested to be associated with the high activity feature of the pore wall. (c) 2006 Elsevier Ltd. All rights reserved.
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