Journal
JOURNAL OF POWER SOURCES
Volume 198, Issue -, Pages 402-407Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2011.09.110
Keywords
Supercapacitor; Redox-mediated gel polymer electrolyte; P-benzenediol; Pseudocapacitance; Electrical double layer capacitance
Funding
- National High Technology Research and Development Program of China [2009AA03Z217]
- National Natural Science Foundation of China [90922028, 50842027]
- Chinese Ministry of Education [211204]
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A supercapacitor based on a novel redox-mediated gel polymer electrolyte (PVA-H2SO4-P-benzenediol) and activated carbon electrodes is assembled. The electrochemical properties of the supercapacitor are evaluated by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. It is found that the supercapacitor exhibits large specific capacitance (474.29 F g(-1)), high energy density (11.31 W h kg(-1)), and excellent cyclical stability. The good performance for the supercapacitor is due to the capacity-storage mechanism combination of the electrical double layer capacitance and Faradaic pseudocapacitance by p-benzenediol/p-benzoquinone in the electrolyte. (C) 2011 Elsevier B.V. All rights reserved.
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