Influence of designed electrode surfaces on double layer capacitance in aqueous electrolyte: Insights from standard models

Standard models, Helmholtz, Gouy-Chapman, Stern and Grahame models have been validated on the electrical double layers (EDLs) formed from three different electrode surfaces, i.e., plain, semi-sphere and cylindrical pore in aqueous electrolyte. The double layer potential (ϕ) and areal capacitance (Cdl) were estimated in the three models using MATLAB Simulink. It was found that the areal capacitance of the double layer strongly influenced by the nature/ type of the electrode surface in contact with the electrolyte. The cylindrical-type pore surface exhibited the large areal capacitance. The charge-discharge and impedance characteristics of the EDLs were also analyzed.