Abstract
We report in-situ synthesis and direct deposition of Fe2O3 nanoparticles (NPs) on the ionic liquid (IL)-functionalized carbon nanotubes (fCNT). As shown in transmission electron microscope (TEM) and scanning TEM (STEM) images, Fe2O3 NPs with the diameter of 3–5 nm are randomly distributed on the sidewall of fCNT, revealing the nanocrystalline structure. The chemical identity and interaction of the fCNT/Fe2O3 composite are investigated by FT-IR, Raman and XPS analyses. In particular, the fCNT/Fe2O3 composite is solution-processable in a form of binder free and self-standing film. Such a free-standing electrode film based on the fCNT/Fe2O3 composite achieve the discharge capacity of 413 mAh g−1 which is much greater than 34 mAh g−1 of the CNT and 191 mAh g−1 of the fCNT due to the redox reaction of Fe2O3 NPs. Moreover, the fCNT/Fe2O3 composite show the coulombic efficiency of 98% and the capacity fading from 272 mAh g−1 to 182 mAh g−1 after 50 cycles of charge/discharge.
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