科研之友
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摘要
Branched alpha-MnO2 nanorods are synthesized using a facile hydrothermal method without surfactants or templates. The formation of alpha-MnO2 with different morphologies, including branched nanorods and nanorods with controllable length, is achieved by controlling the starting concentration of reactants. The morphology and structure of the branched alpha-MnO2 nanorods are fully characterized and the growth mechanism is proposed based on the experimental observation. The novel structures presented here enrich the nanoscale community of alpha-MnO2 materials, thus enabling greater potential applications. The electrochemical properties of as-synthesized branched alpha-MnO2 nanorods are also studied by cyclic voltammetry (CV) and galvanostatic charge/discharge measurement. The branched alpha-MnO2 nanorod electrode shows a high specific capacitance of 182 F g(-1) at a current density of 2 A g(-1), with a good rate capability (72.5% at 64 A g(-1)) and excellent cycling stability.
