Abstract
A carbon-encapsulated Fe3O4 nanocomposite was prepared by a simple one-step pyrolysis of iron pentacarbonyl without using any templates, solvents or surfactants. The structure and morphology of the nanocomposite was investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Brunauer–Emmett–Teller analysis and Raman spectroscopy. Fe3O4 nanoparticles are dispersed intimately in a carbon framework. The nanocomposite exhibits well constructed core–shell and nanotube structures, with Fe3O4 cores and graphitic shells/tubes. The as-synthesized material could be used directly as anode in a lithium-ion cell and demonstrated a stable capacity, and good cyclic and rate performances.
Highlights
Because of agglomerations and the significant volume change of active materials during the redox reaction, Fe3O4 anodes have suffered greatly from poor cyclic performances
Much improved electrochemical performances have been achieved with the modified materials [13]
The SEM image of [Fe3O4–C] (Figure 2) shows that the material consists of interlinked nanotubes and nanogranular structures
Summary
Because of agglomerations and the significant volume change of active materials during the redox reaction, Fe3O4 anodes have suffered greatly from poor cyclic performances. We report a simple method that directly affords a carbon encapsulated Fe3O4 nanocomposite [Fe3O4–C] by employing Fe(CO)5 precursor without any templates, solvents, or surfactants. The Fe3O4 produced from the Fe nanoparticles is encapsulated within the nanotubes or carbon shells.
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