Phase Separation of CuPd Alloy Nanocatalysts in CO Oxidation.
basic_science · Level V
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- Record sourced from PubMed, PMID 39718904.
- Also identified by DOI 10.1021/acsnano.4c13102.
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Abstract
Alloy nanocatalysts exhibit enhanced activity, selectivity, and stability mainly due to their versatile phases and atomic structures. However, nanocatalysts' "real" functional structures may vary from their as-synthesized status due to the structural and chemical changes during the activation and reaction conditions. Herein, we studied the activated CuPd/CeO<sub>2</sub> nanocatalysts under the CO oxidation reaction featuring an atomic-scale phase separation process, resulting in a notable "hysteresis" in catalyst performance. Through the "identical-location" transmission electron microscopy (TEM) characterization, we found that the CuPd nanoparticles (NPs) evolve to a Cu<sub>2</sub>O/CuPd or CuPdO<sub><i>x</i></sub> phase depending on different surface planes of CeO<sub>2</sub> supports under the reaction condition. The detailed dynamic information is obtained by <i>in situ</i> environmental TEM-<i>in situ</i> DRIFTS characterizations to further decouple the effect of pure CO and O<sub>2</sub> gas. The interfacial binding energies between alloy nanoparticles and CeO<sub>2</sub> supports are found to play a critical role in determining the phase separation behaviors. These atomic insights highlight the importance of both the phase separation of alloy nanocatalysts and <i>in situ</i> characterizations of "live" catalysts.