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" Na-Ion Intercalation and Charge Storage Mechanism in 2D Vanadium Carbide "
Bak, SMQiao, RYang, WLee, SYu, XAnasori, BLee, HGogotsi, YYang, XQ
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AL
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| Record Number
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901703
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LA4g78v1cv
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Na-Ion Intercalation and Charge Storage Mechanism in 2D Vanadium Carbide [Article]\ Bak, SMQiao, RYang, WLee, SYu, XAnasori, BLee, HGogotsi, YYang, XQ
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2017
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| Title of Periodical
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Lawrence Berkeley National Laboratory
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| Abstract
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© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim 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.
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