Abstract
AbstractIn this paper, a novel route to synthesize manganese oxide (MnO2) hollow urchins by a reactive template of carbon spheres is described. The formation process of the MnO2 hollow urchins and the mechanism for the removal of the carbon spheres are suggested. The results of scanning electron microscopy and transmission electron microscopy indicate that MnO2 shows a hollow‐urchin structure with an average diameter of 1.5 μm and with cavities that are about 250–500 nm in diameter. The X‐ray diffraction pattern indicates that the as‐prepared hollow urchins are γ‐MnO2. It has a highBrunauer–Emmett–Teller surface area of 110 m2 g–1 and a mesoporous structure. In addition, the magnetic properties of the γ‐MnO2 hollow urchins are investigated. This method opens a way to obtain different morphologies of metal oxides by changing the morphologies of the reactive carbon template. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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