Abstract
Carbon coating is one of the most effective strategies to improve the electrochemical performance of nanostructured transition metal oxides (TMOs). Herein, we report a facile and scalable method to prepare hierarchical Fe3O4@C nanospheres. The fabrication includes one-step solvothermal synthesis of Fe2O3/MIL-100(Fe) precursor and subsequent annealing treatment in Ar. The Fe3O4@C nanospheres with an average size of about 200 nm are composed of many interconnected small nanoparticles, with an amorphous carbon layer on the surface of Fe3O4, exhibiting a unique hierarchical nanostructure with a larger specific surface area of 176.5 m2 g−1. The hierarchical Fe3O4@C nanosphere electrode delivers a high capacity of 757.9 mAh g−1 after 500 cycles at a current density of 500 mA g−1, demonstrating superior high-rate lithium storage performance. This may be ascribed to the unique hierarchical nanoarchitecture, higher specific surface area and the uniform carbon layer in-situ generated from MIL-100(Fe).
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