Adsorbate-driven reactive interfacial Pt-NiO1-x nanostructure formation on the Pt3 Ni(111) alloy surface

Science Advances
Jeongjin KimJeong Young Park

Abstract

The origin of the synergistic catalytic effect between metal catalysts and reducible oxides has been debated for decades. Clarification of this effect, namely, the strong metal-support interaction (SMSI), requires an understanding of the geometric and electronic structures of metal-metal oxide interfaces under operando conditions. We show that the inherent lattice mismatch of bimetallic materials selectively creates surface segregation of subsurface metal atoms. Interfacial metal-metal oxide nanostructures are then formed under chemical reaction environments at ambient pressure, which thus increases the catalytic activity for the CO oxidation reaction. Our in situ surface characterizations using ambient-pressure scanning tunneling microscopy and ambient-pressure x-ray photoelectron spectroscopy exhibit (i) a Pt-skin layer on the Pt-Ni alloyed surface under ultrahigh vacuum, (ii) selective Ni segregation followed by the formation of NiO1-x clusters under oxygen gas, and (iii) the coexistence of NiO1-x clusters on the Pt-skin during the CO oxidation reaction. The formation of interfacial Pt-NiO1-x nanostructures is responsible for a highly efficient step in the CO oxidation reaction. Density functional theory calculations of the ...Continue Reading

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Citations

Jul 23, 2019·Chemical Communications : Chem Comm·Hee Chan SongJeong Young Park
Jan 25, 2020·Physical Chemistry Chemical Physics : PCCP·Chaoran LiGuangwen Zhou
May 22, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Joachim SchnadtNiclas Johansson
Mar 11, 2020·Journal of Synchrotron Radiation·Geonhwa KimKi Jeong Kim
Jan 18, 2020·Nature Communications·Xianhu SunGuangwen Zhou
Nov 8, 2020·Nature Communications·Jeongjin KimJeong Young Park
Jan 6, 2021·Nature Communications·Si Woo LeeJeong Young Park
Dec 9, 2020·Chemical Reviews·Miquel Salmeron, Baran Eren
Jul 11, 2021·The Review of Scientific Instruments·Heath KersellSlavomír Nemšák
Mar 24, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Yongman KimJeong Young Park
Oct 20, 2020·The Journal of Physical Chemistry Letters·Ryo ToyoshimaHiroshi Kondoh

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Methods Mentioned

BETA
scanning tunneling microscopy

Software Mentioned

Vienna ab initio simulation package

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