Design and construction of hollow nanocube NiMoO4 electrode with high performance for asymmetric supercapacitor

In this work, NiMoO4 hollow nanocubes were first successfully obtained via facile solvothermal and subsequent etching process. Assembling two-dimensional NiMoO4 nanosheets into the three-dimensional framework based on Cu2O nanocubes provided outstanding nanostructure stability and excellent electrochemical property. For example, the as-prepared hollow NiMoO4 nanocubes exhibited an outstanding capacitance of 1093 F g−1 at 1 A g−1. In addition, the supercapacitor is composed of hollow NiMoO4 nanocubes as positive electrode and N-rGO as negative electrode, which showed an outstanding energy density (44.01 Wh kg−1) at a power density of 769 W kg−1 in a voltage windows of 0–1.55 V, and even maintained an energy density (23.68 Wh kg−1) at a high power density (7.7 kW kg−1). Furthermore, the device delivered a promising long-term cyclic performance of 84.7% capacitance retention after 5000 charge–discharge cycles.