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Issue 21, 2014
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Indirect growth of mesoporous Bi@C core–shell nanowires for enhanced lithium-ion storage

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Abstract

In this paper, we propose a facile synthetic strategy for uniform bismuth@carbon (Bi@C) core–shell nanowires, which are prepared via controlled pyrolysis of Bi2S3@glucose-derived carbon-rich polysaccharide (GCP) nanowires under an inert atmosphere. Carbonization of GCP and pyrolysis of Bi2S3 into Bi occur at 500 °C and 600 °C, respectively, which increase the specific surface area and the pore volume of the nanowires, thus allowing accommodation of more lithium ions. Meanwhile, the carbon shell serves as a buffer layer to relieve large volume expansion–contraction during the electrochemical alloy formation, and can also efficiently reduce the aggregation of the nanowires. As a proof-of-concept, the Bi@C core–shell nanowire anodes manifest enhanced cycling stability (408 mA h g−1 after 100 cycles at a current density of 100 mA g−1) and rate capacity (240 mA h g−1 at a current density of 1 A g−1), much higher than pure bismuth microparticles and corresponding Bi2S3@C nanowires.

Graphical abstract: Indirect growth of mesoporous Bi@C core–shell nanowires for enhanced lithium-ion storage

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Publication details

The article was received on 31 Jul 2014, accepted on 09 Sep 2014 and first published on 11 Sep 2014


Article type: Paper
DOI: 10.1039/C4NR04378B
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Citation: Nanoscale, 2014,6, 13236-13241
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    Indirect growth of mesoporous Bi@C core–shell nanowires for enhanced lithium-ion storage

    R. Dai, Y. Wang, P. Da, H. Wu, M. Xu and G. Zheng, Nanoscale, 2014, 6, 13236
    DOI: 10.1039/C4NR04378B

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