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(a) A SEM image of a CF; (b) MnO2 nanoflakes uniformly deposited on the CF; (c) A SEM image of PPy wrapping on the MnO2-CF, scale bars of the insets in (b) and (c): 1 μm; (d) A TEM image of MnO2 nanoflakes; (e) High resolution TEM image and the inset SAED pattern of MnO2 nanoflakes showing the polycrystalline nature of MnO2; (f) XRD of MnO2 structure showing the ε-MnO2 phase.
