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http://dx.doi.org/10.3740/MRSK.2022.32.7.313

Analysis of Bulk Concentration on Double-Layer Structure for Electrochemical Capacitors  

Khaing, Khaing Nee Nee (Department of Electronics Engineering, Mandalay Technological University (MTU))
Hla, Tin Tin (Department of Electronics Engineering, Mandalay Technological University (MTU))
Publication Information
Korean Journal of Materials Research / v.32, no.7, 2022 , pp. 313-319 More about this Journal
Abstract
Double-layer capacitors (DLCs) are developed with high surface electrodes to achieve a high capacitance value. In the present work, the initial bulk concentration of 1 mol/m3 and 3 mol /m3 are selected to show the consequential effects on the performance of a double-layer capacitor. A 1D model of COMSOL Multiphysics has been developed to analyze the electric field and potential in cell voltage, the electric displacement field and polarization induced by the field, and energy density in a double-layer structure. The electrostatics and the electric circuit modes in COMSOL are used to simulate the electrochemical processes in the double-layer structure. The analytical analysis of a double-layer capacitor with different initial bulk concentrations is investigated by using Poisson-Nernst-Plank equations. From the simulation results, the differential capacitance changes as a function of compact layer thickness and initial bulk concentration. The energy density varies with the differential capacitance and voltage window. The values of energy density are dominated by the interaction of ions in the solution and electrode surface.
Keywords
double-layer capacitor; 1D; poisson-nernst-plank; initial bulk concentration; energy density;
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