Significant Study on LIG Supercapacitor Electrode Performance in Different Aqueous Electrolytes

Abstract

Laser-induced graphene (LIG) has gained much attention as a promising material for advanced energy storage solutions, including supercapacitors, due to its many advantages. This study presents the fabrication and characterization of LIG electrodes for electrochemical energy storage, a significant contribution to the field. Laser writing parameters such as laser power and scanning speed were optimized to produce highly conductive and electrochemically active LIG material. Transmission electron microscopy and Raman spectroscopy confirmed the formation of high-quality graphene with excellent electrical conductivity. A systematic investigation of the electrochemical performance of the LIG electrodes was conducted using various aqueous electrolytes, including H 2 SO 4 (sulfuric acid), KOH (potassium hydroxide), NaOH (sodium hydroxide), and Na 2 SO 4 (sodium sulfate), all at the same concentration. A solid-state supercapacitor was assembled using two separate LIG electrodes, and its electrochemical performance was analyzed using Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). The specific areal capacitance of the supercapacitor was determined to be 6.9 mF/cm 2 at a scan rate of 10 mV/s. The device demonstrated performance consistent with many previously reported LIG-based supercapacitors.