Abstract
A core-shell and spherical structured Fe3O4@MnO2 nanostructure is designed and developed via a facile and low-cost two-step method. Core-shell structured Fe3O4@MnO2 with uniform morphology can be obtained after layered structured δ-MnO2 is grown on the surface of Fe3O4 nanospheres. The crystal structures and morphology of as-prepared Fe3O4@MnO2 are characterized by scanning electron microscopy, X-ray diffraction, nitrogen isotherm analysis, and transmission electron microscopy. At the current density of 0.1 A g−1, the specific capacitance of Fe3O4@MnO2 is 243.7 F g−1, and its capacitance retention is almost 100% after 3000 continuous charge/discharge cycles at current density of 1 A g−1. The excellent cycling stability and low cost make this core-shell structured Fe3O4@MnO2 a promising electrode material for practical applications in pseudocapacitors.
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