Choudhury, N.A. and Sampath, S. and Shukla, A.K.
(2008)
Gelatin Hydrogel Electrolytes and Their Application
to Electrochemical Supercapacitors.
Journal of the Electrochemical Society, 155 (1).
A74-A81.
ISSN 0013-4651
Abstract
Gelatin hydrogel electrolytes GHEs with varying NaCl concentrations have been prepared by cross-linking an aqueous solution of gelatin with aqueous glutaraldehyde and characterized by scanning electron microscopy, differential scanning calorimetry, cyclic voltammetry, electrochemical impedance spectroscopy, and galvanostatic chronopotentiometry. Glass transition temperatures
for GHEs range between 339.6 and 376.9 K depending on the dopant concentration. Ionic conductivity behavior of GHEs
was studied with varying concentrations of gelatin, glutaraldehyde, and NaCl, and found to vary between 10−3 and 10−1 S cm−1.
GHEs have a potential window of about 1 V. Undoped and 0.25 N NaCl-doped GHEs follow Arrhenius equations with activation
energy values of 1.94 and 1.88 � 10−4 eV, respectively. Electrochemical supercapacitors �ESs� employing these GHEs in conjunction
with Black Pearl Carbon electrodes are assembled and studied. Optimal values for capacitance, phase angle, and relaxation
time constant of 81 F g−1, 75°, and 0.03 s are obtained for 3 N NaCl-doped GHE, respectively. ES with pristine GHE
exhibits a cycle life of 4.3 h vs 4.7 h for the ES with 3 N NaCl-doped GHE.
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