Facile Synthesis of NiMoO4 Nanorod Electrode for Aqueous Hybrid Supercapacitor with High Energy Density

NiMoO 4 nanorods (NRs) were successfully fabricated on Ni foam with robust adhesion via a simple and cost-effective hydrothermal treatment, followed by a calcined process. In a three-electrode configuration with 3 mol L −1 KOH aqueous solution. The NiMoO 4 NRs supported on Ni foam as working electrodes achieve a high specific capacity of 1320 C g −1 at a charge and discharge current density of 2 mA cm −2 , and a desirable rate capability (884 C g −1 even at 10 mA cm −2 ) and a superior cycling ability with 88% capacity retention after 4000 cycles at 10 mA cm −2 . To enhance the energy density and enlarge the voltage window, the aqueous hybrid supercapacitor has subsequently been constructed by employing the NiMoO 4 and activated carbon electrodes as positive and negative electrodes, respectively, which delivered a high energy density of 52 Wh kg −1 at a power density of 725 W kg −1 . Impressively, the device indicates a long-term cycling stability with capacitance retention of 123% even after 9000 cycles in aa safe voltage range from 0 V to 1.45 V. These results definitely imply the promising prospect of NiMoO 4 NR electrodes for application in supercapacitors.