Enhanced Chemical Reactivity of Pristine Graphene Interacting Strongly with a Substrate: Chemisorbed Carbon Monoxide on Graphene/Nickel(1 1 1)

Graphene is usually considered a chemically inert material. Theoretical studies of CO adsorption on free‐standing graphene predict quite low adsorption energies (<0.1 eV). However, we show here by vibrational spectroscopy and scanning tunneling microscopy that the nondissociative chemisorption of...

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Bibliographic Details
Published in:	ChemCatChem Vol. 7; no. 15; pp. 2328 - 2331
Main Authors:	Smerieri, Marco, Celasco, Edvige, Carraro, Giovanni, Lusuan, Angelique, Pal, Jagriti, Bracco, Gianangelo, Rocca, Mario, Savio, Letizia, Vattuone, Luca
Format:	Journal Article
Language:	English
Published:	Weinheim WILEY-VCH Verlag 03-08-2015 WILEY‐VCH Verlag Wiley Subscription Services, Inc
Subjects:	Adsorption chemisorption graphene nickel surface chemistry vibrational spectroscopy
Online Access:	Get full text
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Summary:	Graphene is usually considered a chemically inert material. Theoretical studies of CO adsorption on free‐standing graphene predict quite low adsorption energies (<0.1 eV). However, we show here by vibrational spectroscopy and scanning tunneling microscopy that the nondissociative chemisorption of CO occurs at cold, pristine graphene grown on Ni(1 1 1). The CO adlayer remains stable up to 125 K, although some coverage survives flashes to 225 K. This unexpected result is explained qualitatively by the modification of the density of states close to the Fermi energy induced by the relatively strong graphene–substrate interaction. The value of the adsorption energy allows us to estimate an equilibrium coverage of the order of 0.1 monolayers at 10 mbar pressure, which thus paves the way for the use of graphene as a catalytically active support under realistic conditions. Graphene grabs gas: Graphene is considered to be chemically inert. However, we find experimentally that CO chemisorption occurs at a single layer of graphene grown on Ni(1 1 1).
Bibliography:	ArticleID:CCTC201500279 MIUR - No. 20105ZZTSE_003; No. RBFR128BEC_004 ark:/67375/WNG-HS9NMDQ6-C Università di Genova - No. PRA 2013 istex:7F9E45F838CC19A79E29D0838AE665137BBD2C1E
ISSN:	1867-3880 1867-3899
DOI:	10.1002/cctc.201500279