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Adsorbate induced surface alloy formation investigated by near ambient pressure X-ray photoelectron spectroscopy

Nierhoff, Anders; Conradsen, Christian; McCarthy, David; Johansson, Tobias Peter; Knudsen, Jan LU and Chorkendorff, Ib (2015) In Catalysis Today 244. p.130-135
Abstract
Formation of meta-stable surface-alloys can be used as a way to tune the binding strength of reaction intermediates and could therefore be used as improved catalyst materials for heterogeneous catalysis. Understanding the role of adsorbates on such alloy surfaces can provide new insights for engineering of more active or selective catalyst materials. Dynamical surface changes on alloy surfaces due to the adsorption of reactants in high gas pressures are challenging to investigate using standard characterization tools. Here we apply synchrotron illuminated near ambient pressure X-ray photoelectron spectroscopy to probe the surface structure of a CuPt model system. We report an investigation of the formation of a CuPt surface alloy induced... (More)
Formation of meta-stable surface-alloys can be used as a way to tune the binding strength of reaction intermediates and could therefore be used as improved catalyst materials for heterogeneous catalysis. Understanding the role of adsorbates on such alloy surfaces can provide new insights for engineering of more active or selective catalyst materials. Dynamical surface changes on alloy surfaces due to the adsorption of reactants in high gas pressures are challenging to investigate using standard characterization tools. Here we apply synchrotron illuminated near ambient pressure X-ray photoelectron spectroscopy to probe the surface structure of a CuPt model system. We report an investigation of the formation of a CuPt surface alloy induced and stabilized by exposure to mbar pressures of CO. The location of Pt within the alloy is assessed by deconvolution of the Pt 4f core level spectra into surface Pt and bulk Pt contributions. The study provides direct evidence on how it is possible to monitor the surface structure under near operation conditions. (C) 2014 Elsevier B.V. All rights reserved. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Surface alloy, Near ambient pressure XPS, CuPt, Bimetallic
in
Catalysis Today
volume
244
pages
130 - 135
publisher
Elsevier
external identifiers
  • wos:000349088000015
  • scopus:84922897800
ISSN
0920-5861
DOI
10.1016/j.cattod.2014.06.024
language
English
LU publication?
yes
id
56c9e7c5-8c63-4da6-96ee-f00f6e9d182b (old id 5185982)
date added to LUP
2015-03-30 15:51:58
date last changed
2017-07-23 04:12:43
@article{56c9e7c5-8c63-4da6-96ee-f00f6e9d182b,
  abstract     = {Formation of meta-stable surface-alloys can be used as a way to tune the binding strength of reaction intermediates and could therefore be used as improved catalyst materials for heterogeneous catalysis. Understanding the role of adsorbates on such alloy surfaces can provide new insights for engineering of more active or selective catalyst materials. Dynamical surface changes on alloy surfaces due to the adsorption of reactants in high gas pressures are challenging to investigate using standard characterization tools. Here we apply synchrotron illuminated near ambient pressure X-ray photoelectron spectroscopy to probe the surface structure of a CuPt model system. We report an investigation of the formation of a CuPt surface alloy induced and stabilized by exposure to mbar pressures of CO. The location of Pt within the alloy is assessed by deconvolution of the Pt 4f core level spectra into surface Pt and bulk Pt contributions. The study provides direct evidence on how it is possible to monitor the surface structure under near operation conditions. (C) 2014 Elsevier B.V. All rights reserved.},
  author       = {Nierhoff, Anders and Conradsen, Christian and McCarthy, David and Johansson, Tobias Peter and Knudsen, Jan and Chorkendorff, Ib},
  issn         = {0920-5861},
  keyword      = {Surface alloy,Near ambient pressure XPS,CuPt,Bimetallic},
  language     = {eng},
  pages        = {130--135},
  publisher    = {Elsevier},
  series       = {Catalysis Today},
  title        = {Adsorbate induced surface alloy formation investigated by near ambient pressure X-ray photoelectron spectroscopy},
  url          = {http://dx.doi.org/10.1016/j.cattod.2014.06.024},
  volume       = {244},
  year         = {2015},
}