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Characterization of a Hexagonal Phosphorus Adlayer on Platinum (111)

Lookup NU author(s): Professor Patrick Briddon

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Abstract

Platinum is a well-known catalytic metal whose efficiency can be degraded by the adsorption of impurities. Using different characterization techniques, such as scanning tunnelling microscopy, low-energy electron diffraction, and X-ray photoelectron spectroscopy, we present a study of phosphorus adsorption on a platinum (111) surface. Under saturation and after annealing at 750 degrees C, phosphorus was Observed to form an ordered hexagonal adlayer with a (4 root 3 x 4 root 3)-R30 degrees symmetry. On the basis. of density functional theory calculations, we propose a model for the phosphorus adlayer, consisting of either P-13 or P-14 clusters. In addition, carbon monoxide adsorption as a function of the phosphorus coverage was also investigated. We found that the phosphorus adlayer prevents carbon monoxide adsorption on Pt(111) reducing its catalytic efficiency.

Publication metadata

Author(s): Heikkinen O, Pinto H, Sinha G, Hamalainen SK, Sainio J, Oberg S, Briddon PR, Foster AS, Lahtinent J

Publication type: Article

Publication status: Published

Journal: The Journal of Physical Chemistry Part C

Year: 2015

Volume: 119

Issue: 22

Pages: 12291-12297

Print publication date: 04/06/2015

Online publication date: 21/05/2015

Acceptance date: 08/02/2015

ISSN (print): 1932-7447

ISSN (electronic): 1932-7455

Publisher: American Chemical Society

URL: http://dx.doi.org/10.1021/jp5126816

DOI: 10.1021/jp5126816

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