NiMoO4@Co(OH)2 core/shell structure nanowire arrays supported on Ni foam for high-performance supercapacitors

Abstract

NiMoO₄@Co(OH)₂ core/shell structure nanowire arrays (NWAs) supported on Ni foam were successfully fabricated via a facile hydrothermal growth and electrochemical deposition route, and applied in supercapacitors (SCs). The smart combination of Co(OH)₂ and NiMoO₄ nanostructures in nanowire arrays exhibited greatly enhanced electrochemical performance. Co(OH)₂ nanoflakes were uniformly wrapped on the surface of each NiMoO₄ nanowire, which increased the capacitance of NiMoO₄ NWAs to a high areal capacitance of 2.335 F cm⁻² at 5 mA cm⁻² and 0.909 F cm⁻² at 50 mA cm⁻². The electrode also exhibited good cycling ability; 83% of the initial capacity was retained after 5000 cycles at a current density of 20 mA cm⁻². These results indicate that the NiMoO₄@Co(OH)₂ NWAs could be a promising electrode material for high-performance electrochemical capacitors.