3D self-supported nanopine forest-like Co3O4@CoMoO4 core-shell architectures for high-energy solid state supercapacitors

A supercapacitor electrode composed of 3D self-supported Co3O4@CoMoO4 core-shell architectures directly grown on nickel foam. The unique architecture take advantage of a large interfacial area, numerous channels for rapid diffusion of electrolyte ions, fast electron transport and the high electrochemical activity. The electrode exhibits high specific capacitance, good rate capability, and cycling stability. Solid-state asymmetric supercapacitor (Co3O4@CoMoO4//CNTs) with a maximum voltage of 1.6 V delivers outstanding cyclic stability, a high energy density of 45.2 W h kg−1 at a power density of 400 W kg−1, and even at a high power density of 6400 W kg−1, the device still has an energy density of 37.0 W h kg−1.