Spinel CoMn2O4 nanosheet arrays grown on nickel foam for high-performance supercapacitor electrode

- Co-Mn carbonate nanosheets on Ni foam were prepared via a facile hydrothermal route.
- Ultrathin porous CoMn2O4 nanosheets obtained after post-annealing treatment.
- Binder-free CoMn2O4/Ni foam electrode shows enhanced electrochemical performance.