期刊
JOURNAL OF POWER SOURCES
卷 142, 期 1-2, 页码 382-388出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2004.11.013
关键词
electrospinning; activated carbon nanofibre; supercapacitor; specific surface area; specific capacitance
A new form of nanofibre web electrode has been fabricated for a supercapacitor using electrospun polybenzimidazol (PBI)-based activated carbon nanofibres. A PBI solution in dimethyl acetamide (DMAc) is electrospun to a fibre web that consists of 250 nm ultra-fine fibres. The web is successfully activated by steam of 30 vol.% and the specific surface area of the activated web is in the range of 500-1220 m(2) g(-1). The electrochemical properties of electrodes and the capacitive behaviour of the resulting capacitors are systematically studied using cyclic voltammetry, ac impedance and constant-current discharge tests. The specific capacitance ranges from 35 to 202 F g(-1), depending on the activation temperature. The nanofibre web activated at 800 degrees C exhibits the largest specific surface area and results in the highest capacitance. The capacitance of the electrical double-layer capacitor is strongly dependent on the specific surface area, pore volume, and resistivity of the samples. (c) 2004 Elsevier B.V. All rights reserved.
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