The NiCoO2 flowers were grown in the NiCoO2 flakes coated Ni foam.
The NiCoO2/Ni foam was directly used as the working electrode without any binders.
The specific capacitance of NiCoO2/Ni foam can reach 756 F/g at 0.75 A/g.
The NiCoO2/Ni foam//rGO hybrid supercapacitor show high energy density.