期刊
ELECTROCHIMICA ACTA
卷 78, 期 -, 页码 398-405出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2012.06.032
关键词
Biodegradable polymer electrolyte; Plasticizer; Biodegradation; Impedance; Supercapacitor
资金
- Defence and Research Development Organisation (DRDO), Govt. of India, New Delhi
Biodegradable polymer electrolyte comprising the blend of chitosan (CS) and starch, plasticized with glycerol, as host polymer and lithium perchlorate (LiClO4) as a dopant is prepared by solution casting technique. The variation of conductivity has been investigated as a function of polymer blend ratio, plasticizer content, and LiClO4 concentration at temperature range of 298-343 K using electrochemical impedance spectroscopy. The maximum conductivity is found to be 3.7 x 10(-4) S cm(-1) at room temperature for 60:40 (CS/starch) concentration. The dielectric properties of the electrolyte film exhibit a long tail feature indicating good capacitance. The activation energy of all samples is evaluated using the Arrhenius plot and it is found to be 0.52-0.75 eV. The DSC thermogram peaks for CS-starch blends decreases with increase in the LiClO4 content. A carbon-carbon supercapacitor is fabricated using suitable blend electrolyte ratio and its electrochemical characteristics are discussed at various temperatures and current density. This supercapacitor shows a fairly good specific capacitance of 133 Fg(-1). (C) 2012 Elsevier Ltd. All rights reserved.
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