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

Abstract

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.