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[摘要]：This study presents a rational synthesis of hierarchical MnO2/conducting polypyrrole (PPy)@carbon nanofiber (CNF) triaxial nano-cables via in situ interfacial redox reaction. Uniform MnO2/PPy multifunctional nanocoatings (similar to 20 nm) are formed on individual electrospun CNFs, constructing a one-dimensional triaxial configuration. The unique architecture enables a maximum value of the MnO2/PPy pseudocapacitance and a strong synergetic effect of each component. The specific capacitance of the ternary nanocomposite as a freestanding electrode reaches as high as 705 F g(-1) at 2mV s(-1). The three-dimensional porous electrode facilitates a large mass loading of active materials up to 2.0 mg cm(-2), which leads to a high areal capacitance of 1.4 F cm(-2). The improved electrical conductivity and strong structural integrity of the nanocomposite also endow the electrodes with good rate capability and long-term cycling stability. The superior electrochemical performance indicates that this method is an effective strategy for developing multifunctional nanocomposite electrodes for energy storage devices. |
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