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The characterization of CeO2 nanozyme. (a) TEM images of CeO2; (b) the dynamic light scattering (DLS) analysis of CeO2; (c) the XPS spectra of the CeO2 nanozyme; the inset shows the high-resolution XPS spectra of Ce3d; (d) the XRD pattern of CeO2 (black curve).
