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

• Published in: Applied surface science Vol. 449; pp. 445 - 453
• Main Authors: Uddin, Md. Shihab, Tanaya Das, Himadri, Maiyalagan, Thandavarayan, Elumalai, Perumal
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.08.2018
• Subjects: Electrical double layer; Electrochemical Impedance; Gouy-Chapman; Grahame models; Helmholtz; Stern; Supercapacitor; Gouy-Chapman; Electrochemical Impedance; Electrical double layer; Stern; Grahame models; Supercapacitor; Helmholtz
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2017.12.088

•Simple analytical models have been developed for three different electrode surfaces for electrical double layers.•The models did not involve assumptions and rigorous treatment.•Double layer potential and areal capacitance of EDL were stimulated for three different surfaces.•The charge/discharge profiles as well as impedance were accounted for three different pores surface area.•The cylindrical-type surface exhibited large areal capacitance. 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.