Choudhury, N.A. and Shukla, A.K. and Sampath, S. and Pitchumani, S.
(2006)
Cross-Linked Polymer Hydrogel Electrolytes
for Electrochemical Capacitors.
Journal of the Electrochemical Society, 153 (3).
A614-A620.
ISSN 0013-4651
Abstract
Acidic polyvinyl alcohol/polyacrylic acid blend hydrogel electrolytes �BHEs� were prepared by cross-linking with glutaraldehyde
and perchloric acid. These acidic BHEs were treated suitably to realize alkaline and neutral BHEs. Amorphicity of BHEs was
followed by differential scanning calorimetry. Ionic conduction in acidic BHEs was found to take place by a Grötthus-type
mechanism whereas in alkaline and neutral BHEs it was due to a segmental motion mechanism. Ionic conductivity of BHEs was
found to range between 10−3 and 10−2 S cm−1. Electrochemical capacitors assembled with acidic polyvinyl alcohol hydrogel
electrolyte yielded a maximum capacitance of �60 and 1000 F g−1 with BP carbon and RuOx·xH2O/C electrodes, respectively.
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