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Hierarchical hollow nanostructured MnO2 has been fabricated using polyaniline spheres as reactive templates. The reaction between KMnO4 and polyaniline leads to the reduction of KMnO4 into Mn2+ ions that are further oxidized by excessive KMnO4 into MnO2 layers. Meanwhile, the polyaniline cores are over-oxidized and diffuse into the solution to form the cavity. The ratio of the KMnO4 and polyaniline...
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