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Na‐Ion Intercalation and Charge Storage Mechanism in 2D Vanadium Carbide
Journal article   Open access   Peer reviewed

Na‐Ion Intercalation and Charge Storage Mechanism in 2D Vanadium Carbide

Seong‐Min Bak, Ruimin Qiao, Wanli Yang, Sungsik Lee, Xiqian Yu, Babak Anasori, Hungsui Lee, Yury Gogotsi and Xiao‐Qing Yang
Advanced energy materials, v 7(20), 1700959
25 Oct 2017
DOI: https://doi.org/10.1002/aenm.201700959
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https://doi.org/10.1002/aenm.201700959View
Published, Version of Record (VoR)Open Access (License Unspecified),  Open

Abstract

charge storage MXene sodium‐ion batteries vanadium carbide X‐ray absorption spectroscopy
2D vanadium carbide MXene containing surface functional groups (denoted as V2CTx, where Tx are surface functional groups) is synthesized and studied as anode material for Na‐ion batteries. V2CTx anode exhibits reversible charge storage with good cycling stability and high rate capability through electrochemical test. The charge storage mechanism of V2CTx material during Na+ intercalation/deintercalation and the redox reaction of vanadium are studied using a combination of synchrotron based X‐ray diffraction, hard X‐ray absorption near edge spectroscopy (XANES), and soft X‐ray absorption spectroscopy (sXAS). Experimental evidence of a major contribution of redox reaction of vanadium to the charge storage and the reversible capacity of V2CTx during sodiation/desodiation process are provided through V K‐edge XANES and V L2,3‐edge sXAS results. A correlation between the CO32− content and the Na+ intercalation/deintercalation states in the V2CTx electrode observed from C and O K‐edge in sXAS results implies that some additional charge storage reactions may take place between the Na+‐intercalated V2CTx and the carbonate‐based nonaqueous electrolyte. The results of this study provide valuable information for the further studies on V2CTx as anode material for Na‐ion batteries and capacitors. Na‐ion intercalation and charge storage mechanism of 2D vanadium carbide MXene are investigated by using a combination of synchrotron‐based X‐ray techniques. It is demonstrated, for the first time, that the redox reaction at the transition metal site in MXene is responsible for the reversible charge storage. The reversible formation/decomposition of carbonate species at the surface upon sodiation/desodiation is also discussed in detail.

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Collaboration types
Domestic collaboration
International collaboration
Web of Science research areas
Chemistry, Physical
Energy & Fuels
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
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