Preparation of Hierarchical Spinel NiCo2O4 Nanowires for High- Performance Supercapacitors

Hierarchical spinel NiCo2O4 nanowires were synthesized by a facile hydrothermal method followed by an annealing treatment. The prepared NiCo2O4 nanowires presented a hierarchical mesoporous structure. Moreover, the effects of precipitant and solvent on morphologies of NiCo2O4 were researched. The results reveal that the hierarchical mesoporous structured NiCo2O4 exhibited corking super capacitor performance with a high specific capacitance of 2876 F.g(-1) at a current density of 1 A g(-1), even increased to 10.0 A g(-1), the specific capacitance could still remain 1290 F g(-1) what's more, the capacitance retention reached 84.7% after 500 cycles, which indicates an excellent electrochemical performance. The results demonstrate hierarchical mesoporous NiCo2O4 potential to be a promising supercapacitor electrode materials and inspire furthered research on binary metal oxides as charge storage materials and offer a new route for the large-scale production of high-performance supercapacitor electrode materials.