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MnO 2 /carbon nanotube [CNT] nanocomposites with a CNT core/porous MnO 2  sheath hierarchy architecture are synthesized by a simple hydrothermal treatment. X-ray diffraction and Raman spectroscopy analyses reveal that birnessite-type MnO 2  is produced through the hydrothermal synthesis. Morphological characterization reveals that three-dimensional hierarchy architecture is built with a highly porous layer consisting of interconnected MnO 2  nanoflakes uniformly coated on the CNT surface. The nanocomposite with a composition of 72 wt.% (K 0.2 MnO 2 ·0.33 H 2 O)/28 wt.% CNT has a large specific surface area of 237.8 m 2 /g. Electrochemical properties of the CNT, the pure MnO 2 , and the MnO 2 /CNT nanocomposite electrodes are investigated by cyclic voltammetry and electrochemical impedance spectroscopy measurements. The MnO 2 /CNT nanocomposite electrode exhibits much larger specific capacitance compared with both the CNT electrode and the pure MnO 2  electrode and significantly improves rate capability compared to the pure MnO 2  electrode. The superior supercapacitive performance of the MnO 2 /CNT nancomposite electrode is due to its high specific surface area and unique hierarchy architecture which facilitate fast electron and ion transport.

Hydrothermal synthesis of MnO2/CNT nanocomposite with a CNT core/porous MnO2 sheath hierarchy architecture for supercapacitors