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A 3D porous carbon-manganese oxide (3D-C@MnO) nanocomposite is successfully synthesized via a thermal plasma deposition method.The chemical bonds and compositions,phase structures,surface morphologies,etc.of as-obtained 3D-C@MnO nanocomposite were characterized by the various equipment,such as X-ray diffractometer,X-ray photoelectron spectroscopy,and electron microscopes.The electrochemical performances of the 3D-C@MnO nanocomposite electrode showed a specific capacitance of 780 F g-1 at a current density of 2 A g-1 and a capacitance retention rate of 99％ after 5000 charge-discharge cycles at a high current density of 10 A g-1.These excellent capacitive performances may be attributed to the encapsulation of MnO nanoparticles by porous carbon sheets in the 3D-C@MnO nanocomposite structure.It is believed that the carbon-encapsulated MnO nanoparticles can be protected from a volume deformation during the charge adsorption/desorption cycle and can be electrically improved by the encapsulated carbon sheets,resulting in better overall capacitive performance.In addition,this study also demonstrates the practical applicability by assembling a supercapacitor using the as-obtained 3D-C@MnO nanocomposite to glow a light emitting diode.