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a) Schematically illustration of design and fabrication of MnO2/polypyrrole@carbon nanofiber composites. b,c) SEM images of MnO2/polypyrrole@carbon nanofiber composites. Inset is the digital photo of the composite paper as freestanding electrode. d,e) TEM and HRTEM images of MnO2/polypyrrole@carbon nanofiber composites. Reproduced with permission.314 Copyright 2011, RSC.
