fig2

Figure 2. (A) X-ray diffraction patterns of untreated CeO2 and CeO2@void@C. (B) Raman spectra of CeO2 and CeO2@void@C.
Figure 2. (A) X-ray diffraction patterns of untreated CeO2 and CeO2@void@C. (B) Raman spectra of CeO2 and CeO2@void@C.
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