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A MnS/FeS2 heterostructure with a high degree of lattice matching anchored into carbon skeleton for ultra-stable sodium-ion storage

Combining two different compounds into a heterostructure recently emerged as an auspicious strategy to mitigate the issues associated with the sluggish sodium diffusion kinetics of anode materials. Nevertheless, studies relating to as-designed heterostructures, so far, have not considered the matchi...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-11, Vol.9 (42), p.24024-24035
Main Authors: Luchao Yue, Wu, Donghai, Wu, Zhenguo, Zhao, Wenxi, Wang, Dong, Zhong, Benhe, Liu, Qian, Liu, Yang, Gao, Shuyan, Asiri, Abdullah M, Guo, Xiaodong, Ma, Dongwei, Sun, Xuping
Format: Article
Language:English
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Summary:Combining two different compounds into a heterostructure recently emerged as an auspicious strategy to mitigate the issues associated with the sluggish sodium diffusion kinetics of anode materials. Nevertheless, studies relating to as-designed heterostructures, so far, have not considered the matching of crystal structures between different compounds. In this work, a heterostructure between MnS and FeS2, featuring identical cubic systems and close lattice parameters, confined in one-dimensional carbon nanofibers was synthesized through electrospinning technology (denoted as MnS/FeS2@CNFs). An internal built-in electric field is generated at the interface of the heterostructure owing to differences in the bandgaps of the two compounds, and this is conducive to accelerating the Na+ diffusion kinetics and enhancing charge transport. Meanwhile, the one-dimensional carbon skeleton can effectively alleviate volume variations and prevent the aggregation of active material during the sodium storage process. As expected, the MnS/FeS2@CNFs composite delivered good rate performance (322.3 mA h g−1 at 10.0 A g−1) and excellent cycling durability (194.0 mA h g−1 at 10.0 A g−1 over 3600 cycles). In line with DFT calculations, the constructed heterojunction with a small mismatch of ∼3.9% can effectively enhance the electronic conductivity of the composite, thereby accelerating charge transfer. This work can help the development of rational design strategies for heterostructures and provide an in-depth understanding of the functions of heterostructures in the energy-storage field.
ISSN:2050-7488
2050-7496
DOI:10.1039/d1ta06760e