Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 5, Pages 2477-2482Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2010.11.078
Keywords
Electrochemical capacitor; Acidic polymer hydrogel electrolyte; Poly(acrylamide)
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Funding
- Poznan University of Technology [DS 31-223/2011]
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The article presents the results of a study on activated carbon fiber cloth (AC) and a hydrophobic micro-porous polypropylene (PP) membrane, both chemically modified with acidic acetone aldol condensation products, and on testing their use as an electrode material and separator in electric double layer capacitors (EDLCs). Polymer hydrogel used was based on poly(acrylamide) (PAAM), H(2)SO(4) and water. Electrochemical characteristics of EDLCs were investigated by cyclic voltammetry and galvanostatic charge-discharge cycle tests and also by impedance spectroscopy. As a result, the capacitor with polymer hydrogel was found to exhibit similar capacitance as that with the H(2)SO(4) aqueous solution and an excellent high-rate dischargeability. At the 4000th cycle of potential cycling (0.5 A g(-1)) the specific capacitance of 132 F g(-1) was obtained with a energy density of 3.45 Wh kg(-1) at a power density of 56 W kg(-1). The above results provide valuable information to explore the novel composition of EDLCs. (C) 2010 Elsevier Ltd. All rights reserved.
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