Role of Cu Substitution on the Pseudocapacitive Performance of Nano-platelet Shaped Spinels, NixCuzCoyO4 {x=1-z, y=2-z, z=0.2}

- Spinel NixCuzCoyO4 {x = 1-z,y = 2 -z,z = 0.2} is proposed as a pseudocapacitive electrode.
- Cu substitution in the host spinel NiCo2O4 enhances its capacitance (458 Fg−1).
- Ni0.8Cu0.2Co2O4/AC hybrid cell delivers a power density of 12kWkg−1.
- Ni0.8Cu0.2Co2O4/AC exhibits reversibility as well as stable capacitance (∼72Fg−1).