Tracking the Effect of Sodium Insertion/Extraction in Amorphous and Anatase TiO2 Nanotubes

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Department of Chemistry and Soochow University-Western University Centre for Synchrotron Radiation Research, University of Western Ontario, 1151 Richmond Street, London, Ontario N6A 5B7, Canada
§ Department of Mechanical and Material Engineering, University of Western Ontario, London, Ontario N6A 5B9, Canada
*X. Sun: e-mail, [email protected]
*T.-K. Sham: e-mail, [email protected]
Cite this: J. Phys. Chem. C 2017, 121, 21, 11773–11782
Publication Date (Web):April 25, 2017
Copyright © 2017 American Chemical Society
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We report a mechanistic investigation of the electrochemical behavior of TiO2 nanotubes (NTs) in amorphous and anatase phases during sodiation/desodiation. The local structure variations of these two host structures upon Na+ uptake/release are comparatively examined by X-ray absorption near edge structure (XANES) at the Ti K and L, O K, and Na K edges. Upon Na+ insertion/extraction, the surface/near surface XANES analysis at the Ti K edge suggests that the surface/near surface of TiO2 NTs in both phases is partially reduced to metallic Ti from the unstable sodium titanate formed at the electrolyte/electrode interface, and the sodiation of amorphous NTs is more effective than anatase ones. More importantly, it further reveals that irreversible phase transformations from pure amorphous and anatase TiO2 to amorphous sodium titanate take place on the NT surface/near surface after the first cycle of discharge/charge. The bulk XANES analysis at the Ti L edge demonstrates that irreversible phase transformation also proceeds in the bulk of these two phase structures, where, however, the formation stable amorphous sodium titanate is observed. All the findings are corroborated by energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), and XANES analysis at the O K and Na K edges.

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpcc.7b01106.

  • Crystal structure projections, electrochemical cycling data, SEM, EDX, and XRD results, calculated X-ray attenuation length, and the Ti L3,2-edge TEY XANES (PDF)

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