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ε-MnO2 microspheres have been synthesized using a self-sacrificial template method by annealing MnCO3 microspheres. The transformation process from MnCO3 to MnOx at four different annealing temperatures has been investigated. XRD data show that MnOx samples obtained at 250, 350, 450, and 550 °C are corresponding to MnCO3, the mixture of MnCO3 and ε-MnO2, pure ε-MnO2 and pure Mn3O4, respectively. SEM...
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