Journal
JOURNAL OF POWER SOURCES
Volume 157, Issue 1, Pages 605-609Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2005.07.024
Keywords
hybrid capacitor; activated carbon; Ni(OH)(2) electrode; polymer hydrogel electrolyte; electric double layer capacitor
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A new hybrid capacitor (HC) cell was assembled using an activated carbon (AC) negative electrode, an Ni(OH)(2) positive electrode and a polymer hydrogel electrolyte prepared from crosslinked potassium poly(acrylate) (PAAK) and KOH aqueous solution. The HC cell was characterized compared with an electric double layer capacitor (EDLC) using two AC electrodes and the polymer hydrogel electrolyte. It was found that the HC cell successfully worked in the larger voltage range and exhibited ca. 2.4 times higher capacitance than the EDLC cell. High-rate dischargeability of the HC cell was also superior to that of the EDLC cell. These improved characteristics strongly suggest that the HC cell can be a promising system of capacitors with high energy and power densities. (c) 2005 Elsevier B.V. All rights reserved.
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