Well-connected NiMoS4 nanosheets and Ni foam skeleton bonded through conductive reduced graphene oxide for highly efficient hybrid supercapacitor.

Considering the connected function, high conductivity and electrochemical double layer capacitance properties of reduced graphene oxide (RGO), the NiMoS 4 nanosheets were anchored on RGO coated Ni foam by a facile hydrothermal method to obtain the NiMoS 4 @RGO/Ni foam self-supporting electrode without the extra binders. Surprisingly, the prepared NiMoS 4 @RGO/Ni foam with unique hierarchical lamellar structure can exhibit the high specific capacity of 408 mAh/g at 0.5 A/g, which can be compared with all relevant NiMoS 4 reports. In view of the good supercapacitor performances and practical application feasibility of NiMoS 4 @RGO/Ni foam, the NiMoS 4 @RGO/Ni foam//AC hybrid supercapacitor device also can show the comparable energy density of 67.4 Wh/kg at 562.5 W/kg to that of all NiMoS 4 based hybrid supercapacitors, as well as the good cycle stability. This work can indeed improve the supercapcaitor properties of NiMoS 4 based materials, and be also treated as an important attempt of NiMoS 4 based materials for supercapacitors. Unlabelled Image • The connected NiMoS 4 nanosheets and Ni foam was bonded by RGO. • The NiMoS 4 @RGO/Ni foam can serve as a self-supporting electrode. • The NiMoS 4 @RGO/Ni foam exhibits the ultrahigh specific capacity of 408 mAh/g. • The NiMoS 4 @RGO/Ni foam//AC device shows comparable energy density of 67.4 Wh/kg. [ABSTRACT FROM AUTHOR]