] Unlike noble metals such as Au and Pd that form discrete supported domains, transition metals tend to encompass more dynamic structural transformations. ] For example, recent advances in single‐atom catalysts have brought unprecedented opportunities to unveil the bonding, coordination, and charge transfer at the atomic level that influence catalytic performances. Ranging from single atoms to subnanomeric clusters and nanocrystals, the geometric and electronic properties of supported metal catalysts can be exquisitely tailored through modulating the interactions between the supported metals and the underlying substrate. Supported metal nanostructures are an important class of materials for catalysis. The dynamic behavior of the supported metal species can be further exploited to realize exquisite control and rational design of multicomponent nanocatalysts. Combining soft and solid‐state chemistry of colloidal nanocrystals provide a well‐defined platform to understand, elucidate, and harness metal–support interactions. This interfacial restructuring behavior facilitates tuning of the copper dispersion and the associated creation of surface oxygen defects on CeO 2, which gives rise to enhanced activities and stabilities catalyzing water–gas shift reaction. Driven by the interfacial interactions between the presynthesized Cu and CeO 2 nanocrystals, Cu atoms migrate and redisperse onto the CeO 2 surface via a solid–solid route. Here, a nanocrystal‐based atom‐trapping strategy to access atomically precise Cu‐CeO 2 nanostructures for enhanced catalysis is reported.
However, accurately identifying and rationally tuning the local structures in Cu‐CeO 2 have remained challenging, especially for nanomaterials with inherent structural complexities involving surfaces, interfaces, and defects. Due to tunable redox properties and cost‐effectiveness, copper‐ceria (Cu‐CeO 2) materials have been investigated for a wide scope of catalytic reactions.
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