Precise solid-phase synthesis of CoFe@FeOx nanoparticles for efficient polysulfide regulation in lithium/sodium-sulfur batteries

Yanping Chen, Yu Yao, Wantong Zhao, Lifeng Wang, Haitao Li, Jiangwei Zhang, Baojun Wang, Yi Jia, Riguang Zhang (), Yan Yu () and Jian Liu ()
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Yanping Chen: Chinese Academy of Sciences
Yu Yao: University of Science and Technology of China
Wantong Zhao: Taiyuan University of Technology
Lifeng Wang: University of Science and Technology of China
Haitao Li: Chinese Academy of Sciences
Jiangwei Zhang: Inner Mongolia University
Baojun Wang: Taiyuan University of Technology
Yi Jia: Zhejiang University of Technology
Riguang Zhang: Taiyuan University of Technology
Yan Yu: University of Science and Technology of China
Jian Liu: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Complex metal nanoparticles distributed uniformly on supports demonstrate distinctive physicochemical properties and thus attract a wide attention for applications. The commonly used wet chemistry methods display limitations to achieve the nanoparticle structure design and uniform dispersion simultaneously. Solid-phase synthesis serves as an interesting strategy which can achieve the fabrication of complex metal nanoparticles on supports. Herein, the solid-phase synthesis strategy is developed to precisely synthesize uniformly distributed CoFe@FeOx core@shell nanoparticles. Fe atoms are preferentially exsolved from CoFe alloy bulk to the surface and then be carburized into a FexC shell under thermal syngas atmosphere, subsequently the formed FexC shell is passivated by air, obtaining CoFe@FeOx with a CoFe alloy core and a FeOx shell. This strategy is universal for the synthesis of MFe@FeOx (M = Co, Ni, Mn). The CoFe@FeOx exhibits bifunctional effect on regulating polysulfides as the separator coating layer for Li-S and Na-S batteries. This method could be developed into solid-phase synthetic systems to construct well distributed complex metal nanoparticles.

Date: 2023
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DOI: 10.1038/s41467-023-42941-9

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