Abstract
Preparation of carbon-supported nano-MnO 2 composite (MnO 2/C) by microemulsion process is reported. As evidenced by high-resolution transmission electron microscopy (HR-TEM) micrographs, highly dispersed MnO 2 nanorods over carbon surface with clear inter-phase boundaries are obtained. X-ray diffraction results of as grown composite powder confirm the αMnO 2 phase of manganese oxide that on annealing at elevated temperatures undergo oxidative transformation to Mn 3O 4 and Mn 2O 3 phases. The small size and high dispersion of MnO 2 nanorods in the composite material exhibited high capacitance of 165 Fg −1 for MnO 2/C and 458 Fg −1 for pure MnO 2.
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