α-MnO2 was prepared by a traditional hydrothermal method (31). In a typical experiment, 5 mM KMnO4 was first dissolved into the solution of 24 ml of 1.0 M HCl. Then, the volume was filled to 70 ml by adding distilled water. After stirring for half an hour, the solution was transferred to a 100-ml hydrothermal reactor. The reactor was placed at 140°C and reacted for 18 hours. The solution was then filtered to obtain the solid product, which was washed by distilled water and ethanol for three times. The MnO2 nanorods were synthesized after drying in a vacuum oven at 80°C.

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