Abstract
MnO2 nano hollow sphere was prepared by liquid co-precipitation with different concentrations of cationic surfactant CTAB. The morphology and structure of the prepared MnO2 were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (FT-IR) and low temperature nitrogen adsorption. It was revealed that the obtained manganese dioxide was α-MnO2 and the particle size of samples was between 100 and 300nm. As evidenced by the cyclic voltammetry and galvanostatic charge/discharge test, 0.014mol/L was found to be the optimum impact concentration of CTAB. The MnO2 synthesized under optimum conditions showed the specific capacitance 178F/g at the current density of 500mA/g and its BET area is 229.8m2/g, compared to the 126F/g and 178.4m2/g of the MnO2 synthesized without surfactant.
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