Growth\nof NiCo₂O₄@MnMoO₄ Nanocolumn Arrays\nwith Superior Pseudocapacitor Properties

Abstract

Three-dimensional heterostructured\nNiCo₂O₄@MnMoO₄ nanocolumn arrays\n(NCAs) on Ni foam were first fabricated through an improved two-step\nhydrothermal process associated with a successive annealing treatment.\nThe hybrid NiCo₂O₄@MnMoO₄ electrode\nexhibited remarkable pseudocapacitor property with high initial mass\nspecific capacitance of 1705.3 F g^–1 at 5 mA cm^–2, and retained 92.6% after 5000 cycles, compared to\nthe bare NiCo₂O₄ electrode with 839.1 F g^–1 and 90.9%. The excellent capacitive property of the\nNiCo₂O₄@MnMoO₄ hydrid was attributed\nto its high-electron/ion-transfer rate, large electrolyte infiltrate\narea, and more electroactive reaction sites.