Electrochemical Performance of S-rGO Electrodes on Different Aqueous Electrolytes for Supercapacitor Applications

Abstract

Improvement in the supercapacitive performance of heteroatom-doped graphene may only be obtained by heteroatom redox behavior. We investigated sulfur doped reduced graphene oxide (S-rGO) synthesis utilising microwave reactor assisted processes using sodium sulfide hydrate (Na2S) as sulfur precursors. An experimental investigation was conducted to comprehend the electrochemical behaviour in various aqueous electrolytes for instance sulfuric acid (H2SO4), potassium sulfate (K2SO4), and potassium hydroxide (KOH). Various methods were employed to evaluate the electrochemical performing of the S-rGO electrode, for example cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrical impedance spectroscopy (EIS). S-rGO electrode in 1 M H2SO4 exhibit the superior specific capacitance (Csp) up to 352 Fg-1 at 0.5 Ag-1.