Abstract
In this study, we meticulously investigated the charge storage characteristics of hydrothermally prepared NiMn2O4 nanoflakes and NiMn2O4@g-C3N4 nanocomposites for supercapacitor applications. Comprehensive physico-chemical analyses, including crystalline structure, surface morphology, and elemental composition, confirmed the superior material properties of the synthesized composites. The NiMn2O4@g-C3N4 nanocomposites electrodes demonstrated an outstanding specific capacitance of 1530 F/g at 3 A g−1 and 93.7 % at 5000 cycles, outperforming the NiMn2O4 nanoflakes (751 F/g & 84.2 %) in a 1 M KOH aqueous solution. The remarkable electrochemical performance of the NiMn2O4@g-C3N4 nanocomposites electrode is attributed to the synergistic effect and enhanced interfacial connection between NiMn2O4 nanoflakes and g-C3N4 nanosheets, which facilitate rapid electron and ionic transport. This work significantly contributes to the advancement of composite materials for energy storage applications, particularly in high-performance supercapacitors.
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