Abstract
α-Fe2O3 with various morphologies including spindle, rod, tube, disk, and ring were synthesized through controlling the H2PO4− etching process. The concentrations of H2PO4− plays an important role in controlling the morphology change of the samples. Selected adsorption of H2PO4− ions resulted in anisotropic growth. In addition, the etching of H2PO4− occurred in the center of rods which resulted in tubal α-Fe2O3. Nanodiscs were created once the etching process occurred on the wall of the tube. The electrochemical test shows that disklike samples revealed excellent specific capacitance, rate capacity and cycling stability because of relative higher surface area and pore structure. For the CO catalytic oxidation properties, spindle samples exhibited super catalytic activity.
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