Abstract
MnO2 films grown on nickel foam (NF) with a desirable 3D structure are investigated as electrochemical pseudocapacitor materials for potential energy storage applications. The prepared MnO2 films are characterized by X-ray diffraction, FT-IR and scanning electron microscopy. Results indicate that the products are typical hexagonal ɛ-MnO2 with a uniform nanorod structure. The electrochemical measurements showed that the MnO2 films with rods-like morphology have excellent electrochemical performances and its specific capacitance value as single electrode is up to 664 F g−1 at a discharge current density of 5.5 A g−1, which is higher than that of most reported corresponding materials. The specific capacitance retention ratio is 76.7% at the current density range from 5.5 to 30 A g−1. Furthermore, we found that the deposition conditions such as deposition potential and deposition mass have a pronounced effect on their electrochemical activities.
Published Version
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