Multidimensional and Binary Micro CuCo₂O₄/Nano NiMoO₄ for High-Performance Supercapacitors

Abstract

A multidimensional micro CuCo₂O₄/nano NiMoO₄ architecture is prepared\non Ni foam by the hydrothermal method.\nThe structure consists of urchinlike CuCo₂O₄ microspheres covered by ultrathin NiMoO₄ nanosheets.\nThe synergistic effect depends on the diversity of space and composition.\nThe one-dimensional CuCo₂O₄ nanoneedles enhance\nthe charge transport and carry the two-dimensional NiMoO₄ nanosheets. The nanosheets can expose abundant active sites and\nact as an armor to alleviate the volume change and maintain the structural\nintegrity during long-term cycling. The three-dimensional skeleton\nintegrates the intrinsic properties and external spatial effect of\neach component. The corresponding supercapacitor exhibits a high specific\ncapacity of 276 mAh g^–1 at 1 A g^–1, good rate capability, and excellent cycling stability of 98.3%\nover 8000 cycles. The concept of integrating the multidimensionality\nand multicomponent provides a universal approach to develop high-performance\nmaterials.