| Summary: | In this paper, we have reported a low-concentration active electrolyte of KBrO<sub>3</sub> for the supercapacitor’s application. The electrochemical processes were carried out in two concentrations of KBrO<sub>3</sub> with 0.2 and 0.4 M. Additionally, we have reported a novel strategy for doping graphene during its fabrication process with a potassium bromide (KBr) solution. The chemical doping of graphene with KBr improved the electrochemical properties of graphene used as supercapacitors. HRTEM images confirmed the multi-layer graphene obtained by CO<sub>2</sub> laser based on polyimide. The effect of KBr on the graphene lattice has been studied using Raman spectroscopy. The two electrodes of graphene and KBr-doped graphene were subjected to the electrochemical properties study as a supercapacitor by electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic charge-discharge techniques. The results exhibited the successful method of graphene doping and the stability of using KBrO<sub>3</sub> as a suitable electrolyte for electrochemical processes with this lower molarity. The specific capacitance of the pristine graphene capacitor in 0.2 M of KBrO<sub>3</sub> was 33 Fg<sup>−1</sup>, while this value increased up to 70 Fg<sup>−1</sup> for KBr-doped graphene in 0.4 M of KBrO<sub>3</sub>. The specific capacity in mAhg<sup>−1</sup> has also increased twofold. The results exhibited the possibility of using KBrO<sub>3</sub> as an electrolyte. The supercapacitor performance almost showed good stability in the life cycle.
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