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

Abstract

Nickel molybdate (NiMoO${}_4$) nanowires were prepared on chemical-vapor-deposition-grown three-dimensional graphene skeletons by hydrothermal method. The X-ray diffraction and Raman results show that NiMoO${}_4$ is $\alpha$ 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 the good stability with a cycling efficiency of 97.3% after 1000 cycles. Further, the energy density reaches an energy density of 41 Wh kg${}^{-1}$ at a steady power density of 1319 W kg${}^{-1}$. These results demonstrate the potential of the designed composite for the future flexible and lightweight energy storage.

8 pages, 3 figures