2.2 Characterization
The crystalline structure of as-prepared samples was characterized by
XRD. And their morphologies were observed by SEM and TEM. Texture
properties were obtained by N2-adsorption isotherms. And
their redox capacities were tested by H2-TPR and
O2/O3-TPD. To further validate the
oxygen mobility on the samples, XPS, FT-IR and Raman spectroscopies were
also measured. The details of characterization are shown in Supporting
information (SI).