Construction of NiCo2O4@Ni0.85Se core-shell nanorod arrays on Ni foam as advanced materials for an asymmetric supercapacitor

Abstract Herein, we design and construct the hierarchical NiCo 2 O 4 @Ni 0.85 Se core-shell architecture directly growing on Ni foam as advanced materials for supercapacitor. The composite materials deliver excellent electrochemical performance with a high specific capacitance of 1454 F/g and superior cycle life with 88.5% retention after 10000 cycles, which ascribed to the synergistic effect of pure NiCo 2 O 4 and Ni 0.85 Se. Furthermore, the NiCo 2 O 4 @Ni 0.85 Se//AC asymmetric supercapacitor were fabricated with a highest energy density of 29.3 W h kg −1 at power density of 799 W kg −1 . It is expected that the NiCo 2 O 4 @Ni 0.85 Se will be a kind of promising electrode materials for supercapacitor.