3D net-like Co3O4@NiO nanostructures for high performance supercapacitors

Abstract

Co₃O₄@NiO composite electrode materials were successfully synthesized by a two-step hydrothermal method followed by annealing treatment. Due to their three-dimensional network structure, these composite materials exhibited a large specific surface area, enhancing their electrochemical performance. Consequently, the Co₃O₄@NiO electrode demonstrated a specific capacitance of 1306 F g⁻¹ at a current density of 1 A g⁻¹, an excellent specific capacitance retention rate of 95.5% after 3000 cycles even at 8 A g⁻¹ and a coulombic efficiency approaching 100%. These outstanding properties make the Co₃O₄@NiO composite materials promising electrode materials for high performance supercapacitors.