Catalytic Synergy on PtNi Bimetal Catalysts Driven by Interfacial Intermediate Structures,ACS Catalysis

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Catalytic Synergy on PtNi Bimetal Catalysts Driven by Interfacial Intermediate Structures
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-08-19 , DOI: 10.1021/acscatal.0c02467
Taek-Seung Kim _{1,

2} , Jeongjin Kim ₂ , Hee Chan Song _{1,

2} , Daeho Kim _{1,

2} , Beomgyun Jeong ₃ , Jouhahn Lee ₃ , Jae Won Shin ₂ , Ryong Ryoo _{1,

2} , Jeong Young Park _{1,

2}

Affiliation

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–NiO_1–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–NiO_1–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–NiO_1–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.

中文翻译：

界面中间结构驱动的PtNi双金属催化剂的催化协同作用

铂基双金属催化剂在各种被吸附物环境中均表现出表面原子重排，这极大地影响了催化作用。对催化过程中产生的中间结构的分子水平的理解对于开发高性能双金属催化剂至关重要。我们表明，中间的Pt–NiO ₁ – _x界面结构驱动了在Pt ₃ Ni纳米晶体上观察到的催化协同作用。在环境压力下的实时显微镜观察表明，在表面上形成了由氧气驱动的氧化镍簇，并提供了Pt–NiO ₁ – _x的直接证据。界面结构的形成。光谱分析，包括环境压力X射线光电子能谱和漫反射红外傅里叶变换光谱，以及催化测量，阐明了Pt–NiO ₁ – _x界面结构的作用以及在CO氧化中的催化反应机理。我们的结果表明，双金属催化剂中的金属氧化物界面中间结构与强金属-载体相互作用（SMSI）效应的催化增强有关。

更新日期：2020-09-20

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