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 (C_sp) up to 352 Fg^-1 at 0.5 Ag^-1.