fig4

Figure 4. Ex-situ XPS spectra of pristine (OCV), lithiated (0.8 V), and delithiated (3.0 V) Nb4W7O31 samples: (A) Nb-3d and (B) W-4f.
Figure 4. Ex-situ XPS spectra of pristine (OCV), lithiated (0.8 V), and delithiated (3.0 V) Nb4W7O31 samples: (A) Nb-3d and (B) W-4f.
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