Flexible high-energy asymmetric supercapacitors based on MnO@C composite nanosheet electrodes

A flexible asymmetric supercapacitor assembled with novel MnO@C composite nanosheets and Co 3 O 4 nanosheets as negative and positive electrodes achieves an exceptional energy density of 59.6 W h kg −1 at a power density of 1529.8 W kg −1 .