Abstract
The simple hydrothermal approach was used to synthesize the NiO–Co3O4 nanocomposite. The effect of molar ratios of Ni and Co were studied. The synthesized nanocomposite was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy. (FE-SEM) with energy dispersive X-ray spectroscopy (EDX), high-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS). The NiO–Co3O4 nanocomposite with 1:1 ratio exhibited high specific capacitance of 1466 F/g at a scan rate of 10 mV/s and 1018 F/g at current density of 2 A/g. Furthermore, a pouch-type symmetric supercapacitor is fabricated using NiO–Co3O4 as cathode and anode in 1 M KOH as electrolyte, which showed an excellent specific capacitance of 372 F/g at a current density of 2 A/g. The device showed high energy density of 46.511 Wh/kg at 2093 W/kg. In addition, the device showed superior cyclic stability with a retention of 93% over 1000 cycles at 5 A/g. The enhanced electrochemical performance suggested that NiO–Co3O4 nanocomposite would be an ideal candidate for supercapacitors.
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The authors would like to express special thanks of gratitude to Centralized instrumentation and service laboratory, Annamalai university for providing their lab facilities.
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K. Athira: conceptualization, methodology, writing—original draft. S. Dhanapandian: supervision, writing—review & editing. S. Suthakaran: Data curation, visualization. A. Dinesh, Manikandan Ayyar: writing—review & editing.
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Athira, K., Dhanapandian, S., Suthakaran, S. et al. Transition metal oxide-based NiO–Co3O4 nanocomposite as an electrode material for the high-performance supercapacitor. J Mater Sci: Mater Electron 35, 1178 (2024). https://doi.org/10.1007/s10854-024-12962-1
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DOI: https://doi.org/10.1007/s10854-024-12962-1