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g-C3N4@Co3O4 Nanocomposites: Effect of Nitrogen Annealing for Symmetric Supercapacitor Applications
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DOI：10.1002/slct.202506888.png)
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Abstract
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g-C3N4 nanosheets were synthesized by thermal polymerization of melamine followed by N2 annealing, while Co3O4 nanoparticles were prepared via co-precipitation method. Nanocomposites of g-C3N4@Co3O4, with different g-C3N4 contents, were obtained using an annealing-assisted co-precipitation method. X-ray diffraction results confirmed single-phase formation of both materials, and SEM investigations revealed sheet-like and granular morphologies for g-C3N4 and Co3O4, respectively. Electrochemical performance was evaluated in a three-electrode system with Ni foam-supported electrodes in 1 M KOH electrolyte. Cyclic voltammetry (5-100 mV/s) showed distinct redox peaks, while galvanostatic charge-discharge (4-14 A/g) exhibited pseudocapacitive behavior. At 4 A/g, specific capacitances are 290 F/g (g-C3N4), 718 F/g (Co3O4), 720 F/g (10-g-C3N4@Co3O4), and 853 F/g (20-g-C3N4@Co3O4). A symmetric supercapacitor device, using 20-g-C3N4@Co3O4, delivered similar to 131 Wh/kg at similar to 2666 W/kg and retained over 95% capacitance after 10,000 cycles, effectively powering a light-emitting diode (LED).
Keywords:
energy density
power density
supercapacitors
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