Strain-regulated Gibbs free energy enables reversible redox chemistry of chalcogenides for sodium ion batteries

Manipulating the reversible redox chemistry of transition metal dichalcogenides for energy storage often faces great challenges as it is difficult to regulate the discharged products directly. Herein we report that tensile-strained MoSe 2 (TS-MoSe 2 ) can act as a host to transfer its strain to corr...

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Published in:Nature communications 2022-09, Vol.13 (1), p.5588-5588, Article 5588
Main Authors: Jiang, Minxia, Hu, Yingjie, Mao, Baoguang, Wang, Yixin, Yang, Zhen, Meng, Tao, Wang, Xin, Cao, Minhua
Format: Article
Language:English
Subjects:
140/133
140/146
147/28
639/301/299/891
639/4077/4079/891
639/638/161/891
Aquatic plants
Batteries
Chalcogenides
Chemistry
Discharge
Electrochemistry
Electrode materials
Energy storage
Free energy
Gibbs free energy
Humanities and Social Sciences
Molybdenum compounds
multidisciplinary
Reaction kinetics
Science
Science (multidisciplinary)
Sodium
Sodium-ion batteries
Transition metal compounds
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Summary:Manipulating the reversible redox chemistry of transition metal dichalcogenides for energy storage often faces great challenges as it is difficult to regulate the discharged products directly. Herein we report that tensile-strained MoSe 2 (TS-MoSe 2 ) can act as a host to transfer its strain to corresponding discharged product Mo, thus contributing to the regulation of Gibbs free energy change (Δ G ) and enabling a reversible sodium storage mechanism. The inherited strain results in lattice distortion of Mo, which adjusts the d-band center upshifted closer to the Fermi level to enhance the adsorbability of Na 2 Se, thereby leading to a decreased Δ G of the redox chemistry between Mo/Na 2 Se and MoSe 2 . Ex situ and in situ experiments revealed that, unlike the unstrained MoSe 2 , TS-MoSe 2 shows a highly reversible sodium storage, along with an evidently improved reaction kinetics. This work sheds light on the study on electrochemical energy storage mechanism of other electrode materials. Manipulating the redox chemistry of transition metal dichalcogenides still faces challenges. Here the authors report that tensile-strained MoSe2 can pass on the strain to its sodiated product Mo, and thus regulate the Gibbs free energy in the charging process to enable the reversible sodium storage.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-022-33329-2