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

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