Construction of hydrangea-like ZnCo2O4/Ni3V2O8 hierarchical nanostructures for asymmetric all-solid-state supercapacitors

Abstract Reasonable design of multi-component metal oxides hierarchical nanostructures is an effective and promising way to improve electrochemical performances of electrode materials. In this work, novel hydrangea-like ZnCo 2 O 4 /Ni 3 V 2 O 8 hierarchical nanostructures are constructed by adjusting the ratio of ZnCo 2 O 4 and Ni 3 V 2 O 8 . The perfect architecture maximizes the synergistic effect between different components and provides abundant electrochemical reactive sites, promoting the diffusion and transfer of electrolyte ions in electrochemical reaction process. As a result, ZnCo 2 O 4 /Ni 3 V 2 O 8 electrodes deliver an enhanced specific capacitance of 1734 F g −1 at 1 A g −1 and cyclic stability (96% of initial capacitance is retained after 8000 cycles). Furthermore, the assembled ZnCo 2 O 4 /Ni 3 V 2 O 8 //AC device e achieves excellent energy density of 90 Wh kg −1 at power density of 812 W kg −1 , proving the optimized hydrangea-like ZnCo 2 O 4 /Ni 3 V 2 O 8 hierarchical nanostructures are promising electrode material for supercapacitor. In addition, this work supplies helpful insights into rational design of structure and composition of multi-component metal oxides for enhanced electrochemical performance.