Three-dimensional graphene skeletons supported nickel molybdate nanowire composite as novel ultralight electrode for supercapacitors

Abstract Nickel molybdate (NiMoO 4 ) nanowires were prepared by hydrothermal method on chemical-vapor-deposition-grown three-dimensional graphene skeletons. The X-ray diffraction and Raman results show NiMoO 4 nanowires are α phase. This binder-free and ultralight graphene/ NiMoO 4 composite was used as a positive electrode for supercapacitors. This electrode presents a high specific capacitance of 1194 F g −1 at 12 mA cm −2 and good stability with a cycling efficiency of 87.3% after 2000 cycles. Further, the deduced energy density reaches 41 Wh kg −1 at a steady power density of 1319 W kg −1 . These results demonstrate the potential application of the designed composite for future flexible and lightweight energy storage devices.