Polypyrrole-coated manganese dioxide with multiscale architectures for ultrahigh capacity energy storage

摘要: For practical nanoscale development, multiscale architectures composed of uniformly patterned nanomaterials are attractive for various applications in electrochemical devices owing to the benefits derived from their unique structures: relatively large surface area, low tortuousness and interconnected pores. However, although morphological modifications exist, there no reports about one-dimensional (1-D) nanomaterial based because difficulties fabrication uniform 1-D nanostructures. Here we report demonstration metal oxide nanostructure-based that micronodules ca. 30 nm-diameter MnO2 nanofibers on carbon cloth produce energy storage devices. In addition, partially carbonized polypyrrole (CPPy) was coated through vapour deposition polymerization (VDP) subsequent heat annealing give a resistance high rate performance. Then, PPy-coated MnO2-based were assembled within PVA–KOH polymer electrolyte as positive-electrodes solid-state asymmetric supercapacitors (ASCs). This architecture device displays ultrahigh performance (59.5 F cm−3 capacitance 27.0 mW h density). Furthermore, prepared ASCs show cycle stability an enhanced charge transfer coating layers.