Growth of three-dimensional hierarchical Co3O4@NiMoO4 core-shell nanoflowers on Ni foam as electrode materials for hybrid supercapacitors

摘要

In this work, we report a novel battery-type electrode of three-dimensional hierarchical Co3O4@NiMoO4 flower-like hybrid arrays on Ni foam synthesized with the combination of hydrothermal and post-annealing treatment. The Co3O4 nanowire arrays are utilized as scaffolds and interconnected NiMoO4 nanosheets are grown on the surface. The as -prepared Co3O4@NiMoO4 hybrid arrays exhibit outstanding electrochemical performance in terms of specific capacity (636.8 C/g at 5 mA/cm(2)) and cycling stability (84.1% retention over 2000 cycles at 20 mA/cm(2)). The assembled hybrid supercapacitor device based on Co3O4@NiMoO4 and activated carbon as the positive and negative electrodes can achieve a high energy density of 58.5 Wh/kg at 389 W/kg, suggesting the great potential for applications in supercapacitors. (C) 2016 Elsevier B.V. All rights reserved.