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Construction of hierarchical ZnCo2O4@NixCo2x(OH)6x core/shell nanowire arrays for high-performance supercapacitors

Rational design and synthesis of core/shell nanostructures as binder-free electrodes has been believed to be an effective strategy to improve the electrochemical performance of supercapacitors. In this work, hierarchical ZnCo2O4@NixCo2x(OH)6x core/shell nanowire arrays (NWAs) have been successfully constructed by electrodepositing NixCo2x(OH)6x nanosheets onto hydrothermally grown ZnCo2O4 nanowires and investigated as a battery-type electrode for hybrid supercapacitors. Taking advantage of the hierarchical core/shell structures and the synergetic effect between ZnCo2O4 nanowires and NixCo2x(OH)6x nanosheets, the optimised core/shell electrode exhibits remarkable electrochemical performance with a high areal capacity (419.1 μA h cm−2), good rate capability and cycling stability. Moreover, the assembled ZnCo2O4@NixCo2x(OH)6x//activated carbon (AC) hybrid device can be reversibly cycled in a large potential range of 0–1.7 V and deliver a maximum energy density of 26.2 W h kg−1 at 511.8 W kg−1. Our findings indicate that the hierarchical ZnCo2O4@NixCo2x(OH)6x core/shell NWAs have great potential for applications in energy storage devices.