Hydrogenated NiCo2O4 double-shell hollow spheres, combining large specific surface area and high conductivity, are prepared. A specific capacitance increase of >62%, from 445 to 718 F g−1, is achieved at a current density of 1 A g−1. A full cell combined with NiCo2O4 and activated carbon is assembled, and an energy density of 34.8 Wh kg−1 is obtained at a power density of 464 W kg−1.
- Xiaoming Li
- Lianfu Jiang
- Haibo Zeng
