Facet-Controlled Cu2O Support Enhances Catalytic Activity of Pt Nanoparticles for CO Oxidation

Seunghwa Hong; Daeho Kim; Ki-Jeong Kim; Jeong Young Park

doi:10.1021/acs.jpclett.3c00937

Facet-Controlled Cu₂O Support Enhances Catalytic Activity of Pt Nanoparticles for CO Oxidation

J Phys Chem Lett. 2023 Jun 15;14(23):5241-5248. doi: 10.1021/acs.jpclett.3c00937. Epub 2023 Jun 1.

Authors

Seunghwa Hong¹, Daeho Kim¹, Ki-Jeong Kim², Jeong Young Park¹

Affiliations

¹ Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.
² Beamline Research Division, Pohang Accelerator Laboratory (PAL), POSTECH, Pohang 37673, Republic of Korea.

PMID: 37263187
DOI: 10.1021/acs.jpclett.3c00937

Abstract

The metal-support interaction plays a crucial role in determining the catalytic activity of supported metal catalysts. Changing the facet of the support is a promising strategy for catalytic control via constructing a well-defined metal-support nanostructure. Herein, we developed cubic and octahedral Cu₂O supports with (100) and (111) facets terminated, respectively, and Pt nanoparticles (NPs) were introduced. The in situ characterizations revealed the facet-dependent encapsulation of the Pt NPs by a CuO layer due to the oxidation of the Cu₂O support during the CO oxidation reaction. The CuO layer on Pt at cubic Cu₂O (Pt/c-Cu₂O) significantly enhanced catalytic performance, while the thicker CuO layer on Pt at octahedral Cu₂O suppressed CO conversion. The formation of a thin CuO layer is attributed to the dominant Pt-O-Cu bond at the Pt/c-Cu₂O interface, which suppresses the adsorption of oxygen molecules. This investigation provides insight into designing high-performance catalysts via engineering the interface interaction.