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

新型炭材料(中英文) 2024年

作者： Gargi Dhiman Kavita Kumari Bon-Heun Koo Faheem Ahmed nagih m.shaalan Saurabh Dalela Parvez A.Alvi Ranjeet Kumar Brajpuriya Shalendra Kumar Department of Physics School of Advanced EngineeringUPES Industrial Technology Research Institute Changwon National University Changwon Department of Applied Sciences and Humanities Faculty of Engineering and Technology Jamia Millia Islamia Department of Physics College of Science King Faisal University Physics Department Faculty of Science Assiut University Department of Pure & Applied Physics University of Kota Department of Physical Science

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 CO2laser. 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 sheetlike 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 1m KOH as the aqueous electrolyte. The LIG electrodes produced an energy density of ～3.5 μWh cm-2and 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 3 000 cycles at 1 mA/cm2. The symmetric supercapacitor fabricated with LIG electrodes and the tested 1m KOH electrolyte showed a specific capacitance of 23 mF cm-2and maintained excellent retention after 10,000 cycles,showing LIG's potential for supercapacitor applications.

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