Preparation of V2O5 nanobelt arrays/NiO nanosheet arrays composite as supercapacitor electrode material

V 2 O 5 nanobelt arrays (VNBAs) is fabricated on Ni foam by using an easy hydrothermal route and then NiO nanosheet arrays (NNSAs) is grown on VNBAs by using a simple chemical bath deposition approach to form VNBAs/NNSAs composite. It is found that the monocrystalline VNBAs with a lamellar structure is uniformly distributed on nickel foam and the polystalline NNSAs with a close packed structure is closely covered on the VNBAs. CV, GCD, EIS and CA electrochemical techniques are used to test the supercapacitive properties of the VNBAs/NNSAs composite. The single electrode displays a high specific capacity of 875 F g −1 , a good cycling stability of 96.1%, a small charge transfer resistance of 1.32 Ω and a rapid ion diffusivity of 2.5 × 10 −8 cm 2 s −1 . The symmetric supercapacitor combined by the VNBAs/NNSAs displays a large energy density of 120.1 W h kg −1 at 400 W kg −1 and it retains 68.3 W h kg −1 at 8000 W kg −1 . The VNBAs/NNSAs composite with high electrochemical performance is a potential supercapacitor electrode material.