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Operando oxidation and reduction neutron scattering studies on pristine and Pt-coated ceria nanorods

Ceria is widely used as a three-way catalyst support (TWC) for the conversion of automotive emissions due to its excellent redox properties and high oxygen storage capacity (OSC). It has been broadly reported that OSC can be drastically improved by increasing the concentration of oxygen defects and that the redox properties of ceria are controlled by the type, size, distribution, and location (surface or bulk) of the oxygen vacancies. Recently, a partially reduced Ce3O5+x defect phase was discovered on the surface of ceria nanorods, which is distinct from the bulk Frenkel-type defect structure. The higher OSC performance of ceria nanorods relative to other morphologies (such as nanocubes) was attributed to the presence of a higher concentration of these surface defects.