Redox behavior in hyrothermally synthesized thistle flower-like Co₃O₄–NiO-GO composite for advanced supercapacitor electrodes

The advancement in carbon derivatives has significantly boosted the efficacy of recently produced electrodes designed for energy storage applications. Utilizing the hydrothermal technique, conductive single and composite electrodes comprising Co₃O₄–NiO-GO were synthesized and utilized in supercapacitors within three-electrode systems. The Co₃O₄–NiO-GO composite electrode demonstrated better rate capability and excellent long-term reliability, as well as a noteworthy energy density at comparatively large power levels. The Co₃O₄–NiO-GO hybrid electrode had an ideal capacitance of 986.5 F/g at an applied current density of 1 A/g, according to the data. Furthermore, after 5000 cycles, this composite electrode displayed an outstanding cycling stability of 90.4 %. The results indicate that the combined electrode surpasses individual metallic oxide electrodes, with the addition of graphene oxide contributing to the improved performance. When the efficiency of the three samples was evaluated, it was clear that this Co₃O₄–NiO-GO electrode outperformed the GO/Co₃O₄ and GO/NiO electrodes. This improvement can be due to the composite electrode's synergistically impact from Co₃O₄, NiO, and GO.