Issue 34, 2013

Size-dependent oxygen storage ability of nano-sized ceria

Abstract

We thermodynamically studied the size-dependent oxygen storage ability of nano-sized ceria by tracing the surface Ce/O ratio of octahedral particles with different diameters, from the viewpoint of lattice Ce and O in a CeO2 crystallographic structure. The high surface Ce/O ratio with small scale particle size has more excess surface Ce4+ ions, which allows ceria to have an increasing oxygen storage ability in a crystalline lattice. For the perfect octahedron growth shape of ceria, the nonstoichiometric surfaces can produce excess Ce4+ ions, Ce4+ ions can be stabilized by bonding with lattice oxygen, leading to an enhanced oxygen storage ability of ceria. With the increasing particle size, the surface Ce/O ratio approaches to 0.5 owing to the decreased contributions of atoms located at the edges and corners. When the octahedron diameter D = 0.55 nm, the surface Ce/O ratio can reach 0.75. When D = 7.58 nm, the surface Ce/O ratio decreases down to 0.51. If D ≥ 14.61 nm, the surface Ce/O ratios are equal to 0.5. The present study deepens the insight of the size-dependent oxygen storage ability of nano-sized ceria, focusing on the size-dependent excess Ce4+ on nonstoichiometric surfaces of ceria in thermodynamics.

Graphical abstract: Size-dependent oxygen storage ability of nano-sized ceria

Article information

Article type
Paper
Submitted
09 May 2013
Accepted
26 Jun 2013
First published
01 Jul 2013

Phys. Chem. Chem. Phys., 2013,15, 14414-14419

Size-dependent oxygen storage ability of nano-sized ceria

C. Sun and D. Xue, Phys. Chem. Chem. Phys., 2013, 15, 14414 DOI: 10.1039/C3CP51959G

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