Journal
ELECTROCHIMICA ACTA
Volume 135, Issue -, Pages 461-466Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.05.045
Keywords
Gel electrolyte; Redox additive; Pseudocapacitance; High energy density supercapacitor
Categories
Funding
- Science and Technology program of Gansu Province [1308RJZA295, 1308RJZA265]
- National Science Foundation of China [21164009, 21174114]
- program for Changjiang Scholars and Innovative Research Team in University [IRT1177]
- Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education
- Key Laboratory of Polymer Materials of Gansu Province
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A supercapacitor utilize a novel redox-mediated gel polymer (PVA-KOH-PPD) as electrolyte and separator, and activated carbon as electrodes is assembled. The PVA-KOH-PPD gel polymer as potential electrolyte for supercapacitor is investigated by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy techniques. It is found that the supercapacitor exhibits high ionic conductivity (25 mS cm(-1)), large electrode specific capacitance (611 F g(-1)) and high energy density (82.56 Wh kg(-1)). The high performance is attributed to the addition of quick redox reactions at the electrolyte vertical bar electrode interface as PPD undergoes a two-proton/two-electron reduction and oxidation during cycling. Furthermore, the supercapacitor with PVA-KOH-PPD gel polymer shows excellent charge-discharge stability, after 1000 charge-discharge cycles, the supercapacitor still retains a high electrode specific capacitance of 470 F g(-1). It is believed that the idea using redox mediator has a good prospect for improving the performances of supercapacitors. (C) 2014 Elsevier Ltd. All rights reserved.
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