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Carbon nanotube (CNT), as a promising material to enhance electrical conductivity and ionic diffusivity, plays an indispensable role in improving the electrochemical performance of transition metal oxides. In this work, a novel core-shell structure of MnO 2  coating on carbon nanotubes (MnO 2 @CNT) was successfully synthesized via a simple solvothermal method. The internal porous structure of CNT as core can facilitate the penetration of electrolyte while improving the electrical conductivity. The thin MnO 2  nanosheets as shell can simultaneously achieve a large interaction area and rapid ion exchange. Benefitting from the synergistic effects, the MnO 2 @CNT shows an excellent capacitance of 386 F g −1  at 1 A g −1  with the content of MnO 2  about 52 wt.%. In addition, the MnO 2 @CNT retains nearly 93.6% of its initial capacitance after 5000 cycles, indicating its excellent cycling performance.

Ozone-activated CNTs to induce uniform coating of MnO 2 as high-performance supercapacitor electrodes