Journal
NANO LETTERS
Volume 15, Issue 5, Pages 3616-3623Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b01205
Keywords
hexagonal boron nitride (h-BN); intercalation; Pt(111); CO oxidation; confinement effect
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Funding
- National Natural Science Foundation of China [21222305, 21373208, 21321001]
- Ministry of Science and Technology of China [2011CB932704, 2013CB933100, 2013CB834603]
- Chinese Academy of Science [KGZD-EW-T05]
- Office of Energy Research, Office of Basic Energy Sciences, and Chemical Sciences Division of the U.S. Department of Energy [DE-AC02-05CH11231]
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In heterogeneous catalysis molecule-metal interaction is often modulated through structural modifications at the surface or under the surface of the metal catalyst. Here, we suggest an alternative way toward this modulation by placing a two-dimensional (2D) cover on the metal surface. As an illustration, CO adsorption on Pt(111) surface has been studied under 2D hexagonal boron nitride (h-BN) overlayer. Dynamic imaging data from surface electron microscopy and in situ surface spectroscopic results under near ambient pressure conditions confirm that CO molecules readily intercalate monolayer h-BN sheets on Pt(111) in CO atmosphere but desorb from the h-BN/Pt(111) interface even around room temperature in ultrahigh vacuum. The interaction of CO with Pt has been strongly weakened due to the confinement effect of the h-BN cover, and consequently, CO oxidation at the h-BN/Pt(111) interface was enhanced thanks to the alleviated CO poisoning effect.
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