Fig. 6

FESEM images of as-synthesized CeO2 NPs at (a-d) 1 μm and (e-g) 100 nm scale, and (h) histogram showing the particle size distribution of prepared CeO2 NPs.

FESEM images of as-synthesized CeO2 NPs at (a-d) 1 μm and (e-g) 100 nm scale, and (h) histogram showing the particle size distribution of prepared CeO2 NPs.