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A simple and template‐free method for preparing three‐dimensional (3D) porous γ ‐Fe 2 O 3 @C nanocomposite is reported using an aerosol spray pyrolysis technology. The nanocomposite contains inner‐connected nanochannels and γ ‐Fe 2 O 3 nanoparticles (5 nm) uniformly embedded in a porous carbon matrix. The size of γ ‐Fe 2 O 3 nanograins and carbon content can be controlled by the concentration of the precursor solution. The unique structure of the 3D porous γ ‐Fe 2 O 3 @C nanocomposite offers a synergistic effect to alleviate stress, accommodate large volume change, prevent nanoparticles aggregation, and facilitate the transfer of electrons and electrolyte during prolonged cycling. Consequently, the nanocomposite shows high‐rate capability and long‐term cyclability when applied as an anode material for Na‐ion batteries (SIBs). Due to the simple one‐pot synthesis technique and high electrochemical performance, 3D porous γ ‐Fe 2 O 3 @C nanocomposites have a great potential as anode materials for rechargeable SIBs.
Zhang et al. (2014) studied this question.