Facilitated Polysulfide Redox Conversion by Delocalized Electrons in MBene Heterointerface for Highly Stable Lithium-Sulfur BatteriesOA
The shuttle effect of lithium polysulfides(LiPSs)and sluggish redox kinetics severely restrict the development of high-energy lithium-sulfur(Li-S)batteries.To alleviate this issue,this study adopts an in situ design strategy to construct tungsten carbide(WC)nanocrystals on the surface of two-dimensional(2D)tungsten boride(WB)-based MBene,creatively forming a WB@WC heterostructure to optimize the adsorption-migration-catalysis mechanism of LiPSs.The WB-WC heterointerface reduces the reaction energy barrier of LiPSs due to the electron delocalization effect and promotes the deposition/dissociation of Li2S and the transfer of charge.In situ Raman verified that WB@WC can effectively inhibit LiPSs shuttling.In situ X-ray absorption fine structure spectroscopy(XAFS)characterizations further explored the dynamic change of W valence state during LiPSs redox cycle.Encouragingly,the WB@WC-modified Li-S cell delivers an initial capacity of 1277 mAh g-1 at 0.2 C.It exhibits extremely stable cycling performance at 2 C,with a low-capacity decay rate of only~0.024% per cycle.Even under sulfur loading of 7.92 mg cm^(-2),high capacity of 7.9 mAh cm^(-2)can still be achieved.This work provides an effective method for regulating the activity of MBene-based catalysts.
Guifen Wu;Yunmiao Fan;Jiatong Li;Zhaoxi Shen;Yuxiu Xie;Peixun Yang;Jun Pu
Key Laboratory of Functional Molecular Solids(Ministry of Education),Anhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage Materials,College of Chemistry and Materials Science,Anhui Normal University,Wuhu 241002,People''s Republic of ChinaState Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,People''s Republic of ChinaState Key Laboratory of Multiphase Complex Systems,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,People''s Republic of ChinaCollege of Chemistry and Materials Science,Key Laboratory of Analytical Science and Technology of Hebei Province,Institute of Life Science and Green Development,Hebei University,Baoding 071002,People''s Republic of ChinaKey Laboratory of Functional Molecular Solids(Ministry of Education),Anhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage Materials,College of Chemistry and Materials Science,Anhui Normal University,Wuhu 241002,People''s Republic of ChinaKey Laboratory of Functional Molecular Solids(Ministry of Education),Anhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage Materials,College of Chemistry and Materials Science,Anhui Normal University,Wuhu 241002,People''s Republic of ChinaKey Laboratory of Functional Molecular Solids(Ministry of Education),Anhui Provincial Engineering Laboratory for New-Energy Vehicle Battery Energy-Storage Materials,College of Chemistry and Materials Science,Anhui Normal University,Wuhu 241002,People''s Republic of China
信息技术与安全科学
2D MBene heterointerfaceElectron delocalizationIn situ XAFS and XANESPolysulfide conversionBifunctional catalysts
《Nano-Micro Letters》 2026 (7)
P.794-809,16
supported in part by the National Natural Science Foundation of China(No.52207227)the Doctoral Research Initiation Foundation of Anhui Normal University(No.751973)the Natural Science Foundation of Hebei Province(No.B2025201026)the Higher Education Scientific Research Project of Hebei Province(No.QN2026270).
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