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Article Abstract
The dynamic behavior of oxide-supported metal catalyst interfaces under thermal and gaseous activation critically determines their catalytic performance. Using in situ TEM, we reveal the atomic-scale evolution of Au nanoparticles on CeO supports during thermal treatment. The Au/CeO interface structure depends on three key factors: epitaxial matching, nanoparticle morphology, and metal-support interactions, all governed by the balance between Au surface energy, cohesive energy, and interfacial energy with CeO. Thermal activation induces significant structural reorganization in Au nanoparticles, exhibiting size- and support-dependent facet reorientation that follows temperature-driven wetting and sintering trends. These transformations are facilitated by crystalline defects (e.g., twin boundaries and dislocations) that reduce the energy barrier for atomic rearrangement.
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| http://dx.doi.org/10.1016/j.jcis.2025.138229 | DOI Listing |
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