HYDROTHERMAL SYNTHESIS OF CARBON NANOFIBERS/γ-MnO2 NANOWIRES COMPOSITES FOR ELECTROCHEMICAL APPLICATION

摘要

The depletion of natural resources have urged worldwide researchers to develop renewable energy storage devices in many fields, such as hybrid electric vehicles [1,2]. Electrochemical capacitor, also known as the supercapacitor, are one of such devices that stores energy using either interfacial ionic adsorption/desorption process (electrochemical double-layer capacitors, EDLC) or fast and reversible faradaic reactions (pseudocapacitors) [3]. Due to both categories are limited by their natures, it is therefore necessary to improve electrochemical performance to meet higher requirements in the future. Manganese dioxide (MnO2) has been proven to be a promising candidate for the electrode materials, however, the low conductivity restrict its application [4,5]. Many efforts have been made on the incorporation of MnO2 nanostructures into conducting materials including carbon nanotubes and PEDOT [6-8], for the purpose of utilizing MnO2 efficiently. In this work, we report a facile synthesis of carbon nanofibers/Y-MnO2 nanowires (CNF/γ-MnO2) composites using hydrothermal treatments.