Abstract
Abstract Carbon nanotube (CNT)/MnO 2 composites are synthesized by reduction of potassium permanganate under microwave irradiation. The morphology and microstructure of samples are examined by scanning electron microscopy (SEM), transition electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Electrochemical properties are characterized by cyclic voltammetry (CV), galvanostatic charge/discharge and electrochemical impedance spectroscopy (EIS). Birnessite-type MnO 2 homogeneously coats on the surfaces of CNTs. For CNT–15%MnO 2 composite, the specific capacitance based on MnO 2 is 944 (85% of the theoretical capacitance) and 522 F g −1 at 1 and 500 mV s −1 , respectively. When the content of MnO 2 reaches 57 wt%, the composites have the maximum power density (45.4 kW kg −1 , the energy density is 25.2 Wh kg −1 ). Therefore, CNT/MnO 2 composites prepared by microwave irradiation are promising electrode materials in hybrid vehicle systems.
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