Anisotropic oxygen atom diffusion was visualized in ceria under activated conditions; the diffusion was dependent upon crystal orientation, demonstrating a preferential  diffusion pathway.
Significance and Impact
Oxygen reactivity plays a key role in the performance of ceria-based catalysts of interest for photocatalytic water splitting for hydrogen production and solid-oxide fuel cells for energy storage.
- The interplay between Ce and O atoms originates from Coulombic interactions as revealed by the out-of-plane buckling of cerium atoms associated with oxygen transport.
- Center for Nanoscale Materials (CNM) electron microscopy capabilities included the Argonne Chromatic Aberration-corrected TEM (ACAT) and Talos TEM.
Work was performed in part at CNM.
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