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. 2017 Mar 23;7:373. doi: 10.1038/s41598-017-00346-x

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© The Author(s) 2017

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Analysis of the electrochemical desodiation and sodiation of Na₂Ti_0.94Cr_0.06O_2.97. (a) XRD patterns for the Na₂Ti_0.94Cr_0.06O_2.97-carbon composite, pristine electrode, fully charged sample, and discharged to 1.5 V under a current density of 18.9 mA g⁻¹. XPS spectra of the Na₂Ti_0.94Cr_0.06O_2.97 electrodes, the spectra collected for pristine sample, fully charged sample and discharged to 1.5 V as well as by least-squares-fits using a software of XPSPEAK41. (b) Cr 2p spectra. (c) Na 1 s spectra. (d) Ti 2p spectra. (e) O 1 s spectra.