Electrochemical performance of a symmetric supercapacitor device designed using laser-induced multilayered graphene

  • Abstract: This study demonstrates a facile and economical approach for fabricating laser-induced graphene (LIG), which results in improved electrochemical performance. Polyimide polymer was used as a starting material for LIG synthesis and irradiated under ambient conditions using a CO2 laser. The prepared LIG samples were characterized by Raman spectroscopy and FTIR, which validated the formation of multilayered graphene containing sp2 hybridized C=C bonds. The FE-SEM revealed three-dimensional (3D) sheet-like structures, while HR-TEM images displayed lattice planes with an interplanar spacing of approximately 0.33 nm, corresponding to the (002) plane of graphene. The electrochemical performance of the as-prepared LIG samples demonstrated a remarkable areal specific capacitance (CA) of 51 mF cm−2 (170 F g−1) at 1 mA cm−2 (3.3 A g−1) in a three-electrode configuration with 1 mol L−1 KOH as the aqueous electrolyte. The LIG electrodes produced an energy density of ~3.5 µWh cm−2 and a power density of ~350 µW cm−2, demonstrating significant energy storage capabilities. Additionally, the electrodes exhibited excellent cyclic stability, retaining 87% of their specific capacitance after 3000 cycles at 1 mA/cm2. The symmetric supercapacitor fabricated with LIG electrodes and the tested 1 mol L−1 KOH electrolyte showed a specific capacitance of 23 mF cm−2 and maintained excellent retention after 10000 cycles, showing LIG’s potential for supercapacitor applications.

     

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