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    Catalytic Synergy on PtNi Bimetal Catalysts Driven by Interfacial Intermediate Structures

    Year: 2020

    Journal: ACS Catal., Volume 10, SEP 18, page 10459–10467

    Authors: Kim, TS; Kim, J; Song, HC; Kim, D; Jeong, B; Lee, J; Shin, JW; Ryoo, R; Park, JY

    Organizations: Institute for Basic Science (IBS) [IBS-R004]; KBSI [C030140, C030110, C030440]

    Keywords: PtNi nanocrystal; CO conversion; bimetallic synergy; surface restructuring; operando micro/spectroscopy

    Platinum-based bimetallic catalysts exhibit surface atomic rearrangement in various adsorbate environments, which significantly impacts catalysis. A molecular-level understanding of intermediate structures created during catalysis is essential for developing high-performance bimetal catalysts. We show that intermediate Pt-NiO1-x interfacial structures drive the catalytic synergistic effect observed on Pt3Ni nanocrystals. Real-time microscopic observations at ambient pressure show the formation of oxygen-driven Ni oxide clusters on the surface and provide direct evidence of Pt-NiO1-x interfacial structure formation. Spectroscopic analysis, including ambient-pressure X-ray photoelectron spectroscopy and diffuse reflectance infrared Fourier-transform spectroscopy, and catalytic measurements elucidate the role of Pt-NiO1-x interfacial structures and the catalytic reaction mechanism in CO oxidation. Our results indicate that metal-oxide interfacial intermediate structures in bimetal catalysts relate to the catalytic enhancement of the strong metal-support interaction (SMSI) effect.
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