fig4
![Porous Nb<sub>4</sub>W<sub>7</sub>O<sub>31</sub> microspheres with a mixed crystal structure for high-performance Li<sup>+</sup> storage](https://image.oaes.cc/b50138e7-b014-4b20-b158-2bd14aee7500/em4068.fig.4.jpg)
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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