Electric double-layer capacitors with corn starch-based biopolymer electrolytes incorporating silica as filler
Document Type
Article
Publication Date
1-1-2015
Abstract
Solid-state electric double-layer capacitors (EDLCs) based on corn starch biodegradable polymer electrolytes are fabricated. Silica is added into the corn starch polymer electrolytes to improve the ionic conductivity and capacitance of the EDLCs. The ionic conductivity as a function of temperature obeys the Arrhenius equation indicating ionic hopping mechanism in the polymer electrolytes. Linear sweep voltammetry shows that the prepared corn starch-based biopolymer electrolyte is stable in the range from −2.5 to 2.5 V. Electrical capacitance performances of these capacitors are studied by cyclic voltammetry, galvanostatic charge–discharge, and AC impedance spectroscopy. The discharge characteristics have been found to be almost linear, which confirms the capacitive behavior of the EDLC cell. The fabricated EDLC cells perform good cyclability up to 500 cycles with more than 90 % of coulombic efficiency.
Keywords
Polymers, Electrical properties, Transport properties
Divisions
fac_eng,PHYSICS
Funders
Fundamental Research Grant Scheme (FRGS) from Ministry of Higher Education, Malaysia (FP024-2013A),University Malaya Research Grant (UMRG: RG276-14AFR and RP025A-14AFR)
Publication Title
Ionics
Volume
21
Issue
7
Publisher
Springer Verlag (Germany)