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Fe/Fe3C@graphitic carbon shell embedded in carbon nanotubes derived from Prussian blue as cathodes for Li–O2 batteries

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Abstract

The effective design and facile preparation of noble metal-free catalysts is crucial for enhancing the performance of rechargeable Li–O2 batteries. Herein, we report a one-step controlled pyrolysis method to synthesize a Fe/Fe3C@graphitic carbon shell embedded in carbon nanotubes composite (F@NG-NCNTs) with Prussian blue as the single precursor. In these nanostructures, the Fe/Fe3C centres induce the formation of self-assembled N-doped carbon frameworks, which in turn offer superior connectivity as well as a protective coating. This novel architecture not only promotes the transfer of electrons but also uniformly encapsulates the catalytically active Fe/Fe3C nanoparticles, leading to a remarkably enhanced performance in Li–O2 batteries. As a result, cells catalyzed by the F@NG-NCNTs deliver a higher initial discharge capacity (6966 mA h g−1 at a current density of 0.1 mA cm−2) and demonstrate outstanding rate capability and cycle stability. This study verifies that F@NG-NCNTs can be a promising cathode material and provides a new avenue for the effective nanostructural design of electrocatalysts.

Graphical abstract: Fe/Fe3C@graphitic carbon shell embedded in carbon nanotubes derived from Prussian blue as cathodes for Li–O2 batteries

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Publication details

The article was received on 31 Oct 2017, accepted on 10 Dec 2017 and first published on 11 Dec 2017


Article type: Research Article
DOI: 10.1039/C7QM00503B
Citation: Mater. Chem. Front., 2018, Advance Article
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    Fe/Fe3C@graphitic carbon shell embedded in carbon nanotubes derived from Prussian blue as cathodes for Li–O2 batteries

    Y. Lai, Y. Jiao, J. Song, K. Zhang, J. Li and Z. Zhang, Mater. Chem. Front., 2018, Advance Article , DOI: 10.1039/C7QM00503B

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