Abstract
Co(3)O(4)@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 Co(3)O(4)@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 Co(3)O(4)@NiO composite materials promising electrode materials for high performance supercapacitors.