Effect of electrode substrate and poly(acrylamide) hydrogel electrolytes on the electrochemical performance of supercapacitors
Document Type
Article
Publication Date
1-1-2021
Abstract
In this research, poly(acrylamide) hydrogels were produced by means of free radical mechanism. Lithium acetate with different weight percentages (wt.%) such as 10 wt.%, 20 wt.%, 30 wt.%, and 40 wt.% as a source of mobile ions were incorporated into the hydrogel, and the samples were labeled as LAM1, LAM2, LAM3, and LAM4, respectively. The electrochemical impedance spectroscopy (EIS) revealed that LAM4 hydrogel electrolyte achieved the highest ionic conductivity of 9.45 x 10(-3) Scm(-1) with lowest activation energy (0.038 eV) at ambient temperature. The electrochemical performance of the fabricated supercapacitors using optimized LAM4 hydrogel electrolyte and different conducting substrates namely graphite foil, nickel foam, and carbon cloth was analyzed. The cyclic voltammetry and galvanic charge-discharge analyses reported that EDLC with carbon cloth resulted in maximum specific capacitance of 198.64 F g(-1) at 5 mV s(-1) and 439.87 F g(-1) at 500 mA g(-1), respectively.
Keywords
Hydrogel electrolytes, Physical crosslinking, Conducting substrates, Ionic conductivity, Electric double-layer capacitor (EDLC)
Divisions
PHYSICS
Funders
Universiti Malaya,Collaborative Research in Engineering, Science AMP; Technology Center (CREST)
Publication Title
Ionics
Volume
27
Issue
10
Publisher
Springer Verlag (Germany)
Publisher Location
TIERGARTENSTRASSE 17, D-69121 HEIDELBERG, GERMANY