Manganese oxides/SWNTs composite films via anionic surfactant-directed electrochemical synthesis

摘要

In this work, MnO{sub}2/SWNTs composite film was electrodeposited by the galvanostatic anodic oxidation. The plating solution was prepared by manganese sulfate directed on SWNTs via sodium dodecyl benzene sulphonate as the anionic surfactant. It was shown by FE-SEM that the diameters of SWNTs obviously increased. It may be that there were coated MnO{sub}2 on their surface. The specific capacitance values of 137.5 F g{sup}(-1) and 78.3 F g{sup}(-1) were obtained by the cyclic voltammograms experiment, respectively, at the sweep rate of 10 mV s{sup}(-1) and 2000 mV s{sup}(-1). And the impedance studies revealed that the Faraday resistance of MnO{sub}2/SWNTs film was lower than that of the pure MnO{sub}2 film. It attributes to the excellent conductivity of the SWNTs. The resultant MnO{sub}2/SWNTs composite film exhibited stable fast-response character as electrode material for electrochemical capacitors.