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Hierarchical sea-urchin-shaped manganese oxide microspheres were synthesized via a facile method based on the reaction between KMnO 4 and MnSO 4 in HNO 3 solution at 50°C. The average diameter of the microspheres is ∼850nm. The microspheres consist of a core of diameter of ∼800nm and nanorods of width ∼50nm. The nanorods exist at the edge of the core. The Brunauer–Emmett–Teller...
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