The poor electrical conductivity of MnO2 limits its use as an electrode material.To overcome this limitation,we report an easy and rapid approach to deposit nanosized MnO2 onto multi-wall carbon nanotubes functionalized with hydroxyl groups（MWCNTs-OH） by chemical reduction of KMnO4 with MnSO4 in aqueous solution under ambient conditions.Characterization with XRD and TEM reveals that the obtained MnO2/MWCNTs-OH composite is nanocrystalline and partially covered by MnO2 nanosheets with a thickness of 1-3 nm at a MnO2 loading of 20 wt%.Cyclic voltammetry（CV） and galvanostatic charge-discharge measurements reveal that the MnO2/MWCNTs-OH composite with a MnO2 loading of 20 wt% has a relatively high specific capacitance of 234 F/g at a scan rate of 2mV/s and exhibits good cycling stability.Furthermore,the oxygen reduction reaction（ORR） shows that MnO2/MWCNTs-OH composite may have potential applications as a non-noble metal electrocatalyst in fuel cells and metal-air batteries.
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