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Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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Core-Shell C@Sb Nanoparticles as a Nucleation Layer for High-Performance Sodium Metal Anodes.

Guanyao Wang, Ying Zhang, Bingkun Guo

  • 1Institute for Superconducting & Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, NSW 2522, Australia.

Nano Letters
|May 7, 2020
PubMed
Summary

A novel core-shell nanoparticle buffer layer stabilizes sodium metal anodes (SMAs) by promoting uniform sodium deposition. This breakthrough enables long-term, high-efficiency cycling for next-generation batteries.

Keywords:
core−shell structuredendrite-freenucleation layerplating/strippingsodium metal anodes

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Sodium metal anodes (SMAs) are promising for next-generation batteries due to low cost and abundance.
  • Dendrite growth and unstable solid electrolyte interphase limit SMA practical application and reversibility.

Purpose of the Study:

  • To develop a nucleation buffer layer for homogeneous sodium metal deposition.
  • To enhance the long-term cycling stability and Coulombic efficiency of sodium metal anodes.

Main Methods:

  • Fabrication of core-shell C@Sb nanoparticles (NPs) as a nucleation buffer layer.
  • Electrochemical testing of sodium metal cells with the C@Sb NP layer.
  • Analysis of sodium plating/stripping behavior and Coulombic efficiency.

Main Results:

  • The C@Sb NPs facilitate uniform sodium nucleation and deposition via Sb-Na alloy cores protected by carbon shells.
  • Sodium metal cells achieved nearly 6000 hours of stable cycling at 4 mA h cm-2.
  • An average Coulombic efficiency of 99.7% was maintained, demonstrating excellent reversibility.

Conclusions:

  • The core-shell C@Sb NP structure effectively stabilizes sodium metal anodes.
  • This alloy-based nucleation strategy offers a promising pathway for developing high-performance, long-lasting sodium metal batteries.