CO adsorption and CO and O coadsorption on Rh(111) studied by reflection absorption infrared spectroscopy and density functional theory

The Journal of Chemical Physics
G KrennR Schennach

Abstract

The adsorption of carbon monoxide on Rh(111) and on oxygen modified Rh(111) was investigated using thermal desorption spectroscopy, reflection absorption infrared spectroscopy (RAIRS), and density functional theory. The results show that CO adsorbs on Rh(111) in on top sites at low coverages. With increasing coverage hollow sites and bridge sites get occupied according to the RAIRS results. A new vibrational feature at high wave numbers was found in the on top region of the CO stretching frequency. This feature can be explained by a local high density CO structure where two CO molecules are adsorbed in the ( radical3x radical3)R30 degrees structure. The coadsorption of oxygen and carbon monoxide leads to a shift of the CO stretching frequency to higher wave numbers with increasing O to CO ratio. CO adsorption on a (2x1) oxygen layer is possible and RAIRS shows that the CO adsorbs in on top and most likely in bridge sites in this case.

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Citations

Jun 1, 2007·Physical Chemistry Chemical Physics : PCCP·Silvia GonzálezFrancesc Illas
Jul 21, 2007·The Journal of Chemical Physics·Ming-Mei YangWei-Xue Li
Dec 17, 2008·The Journal of Chemical Physics·Anton TamtöglAdolf Winkler
Apr 11, 2018·Physical Chemistry Chemical Physics : PCCP·Hsuan LeeMeng-Fan Luo
Jul 13, 2018·Physical Chemistry Chemical Physics : PCCP·Andreas SchaeferJohan Gustafson
Nov 12, 2009·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Wei LiuQing Jiang
Sep 3, 2014·Nanotechnology·Anna L PinardiJosé A Martín-Gago
May 26, 2017·Physical Chemistry Chemical Physics : PCCP·Po-Wei HsuMeng-Fan Luo
Oct 27, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Zoltán PásztiLászló Guczi
Jul 25, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Lu TanYingchun Liu
Oct 1, 2021·Journal of the American Chemical Society·Yu TangFranklin Feng Tao
Nov 11, 2021·The Journal of Physical Chemistry Letters·Xueyao ZhouBin Jiang

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