Advanced

H-2 reduction of surface oxides on Pd-based membrane model systems - The case of Pd(100) and Pd75Ag25(100)

Fernandes, V. R.; Gustafson, Johan LU ; Farstad, M. H.; Walle, L. E.; Blomberg, Sara LU ; Lundgren, Edvin LU ; Venvik, H. J. and Borg, A. (2014) In Applied Surface Science 313. p.794-803
Abstract
Reduction of the (root 5 x root 5)R27 degrees surface oxide on Pd(1 0 0) and Pd75Ag25(1 0 0) surfaces by H-2 has been studied using high-resolution photoelectron spectroscopy in situ at H-2 pressures 5 x 10(-9) mbar and 5 x 10(-8) mbar and selected temperatures in the range 30 degrees C to 170 degrees C. The reduction is slower on Pd75Ag25(1 0 0) compared to Pd(1 0 0) for all temperatures and pressures investigated. For Pd(1 0 0), the surface oxide reduction rate is rather independent of temperature, while for Pd75Ag25(1 0 0) a nonmonotonic variation is observed. As indicated by kinetic analysis, the complex reduction behavior is not well described by Avrami kinetics. Oxygen spillover effects contribute to this picture for Pd(1 0 0), while... (More)
Reduction of the (root 5 x root 5)R27 degrees surface oxide on Pd(1 0 0) and Pd75Ag25(1 0 0) surfaces by H-2 has been studied using high-resolution photoelectron spectroscopy in situ at H-2 pressures 5 x 10(-9) mbar and 5 x 10(-8) mbar and selected temperatures in the range 30 degrees C to 170 degrees C. The reduction is slower on Pd75Ag25(1 0 0) compared to Pd(1 0 0) for all temperatures and pressures investigated. For Pd(1 0 0), the surface oxide reduction rate is rather independent of temperature, while for Pd75Ag25(1 0 0) a nonmonotonic variation is observed. As indicated by kinetic analysis, the complex reduction behavior is not well described by Avrami kinetics. Oxygen spillover effects contribute to this picture for Pd(1 0 0), while surface compositional effects appear to dominate the performance for Pd75Ag25(1 0 0). These findings may have implications for understanding the oxidation, reduction and hydrogen transport properties of Pd-Ag membranes. (C) 2014 Elsevier B.V. All rights reserved. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
H-2 reduction, PdAg alloy, Surface oxide, Pd75Ag25(100), Photoelectron, spectroscopy
in
Applied Surface Science
volume
313
pages
794 - 803
publisher
Elsevier
external identifiers
  • wos:000340689000106
  • scopus:84904788297
ISSN
1873-5584
DOI
10.1016/j.apsusc.2014.06.077
language
English
LU publication?
yes
id
c37a8e02-4656-417b-ab81-a819d935bcbc (old id 4648850)
date added to LUP
2014-09-24 08:25:20
date last changed
2017-01-01 03:21:59
@article{c37a8e02-4656-417b-ab81-a819d935bcbc,
  abstract     = {Reduction of the (root 5 x root 5)R27 degrees surface oxide on Pd(1 0 0) and Pd75Ag25(1 0 0) surfaces by H-2 has been studied using high-resolution photoelectron spectroscopy in situ at H-2 pressures 5 x 10(-9) mbar and 5 x 10(-8) mbar and selected temperatures in the range 30 degrees C to 170 degrees C. The reduction is slower on Pd75Ag25(1 0 0) compared to Pd(1 0 0) for all temperatures and pressures investigated. For Pd(1 0 0), the surface oxide reduction rate is rather independent of temperature, while for Pd75Ag25(1 0 0) a nonmonotonic variation is observed. As indicated by kinetic analysis, the complex reduction behavior is not well described by Avrami kinetics. Oxygen spillover effects contribute to this picture for Pd(1 0 0), while surface compositional effects appear to dominate the performance for Pd75Ag25(1 0 0). These findings may have implications for understanding the oxidation, reduction and hydrogen transport properties of Pd-Ag membranes. (C) 2014 Elsevier B.V. All rights reserved.},
  author       = {Fernandes, V. R. and Gustafson, Johan and Farstad, M. H. and Walle, L. E. and Blomberg, Sara and Lundgren, Edvin and Venvik, H. J. and Borg, A.},
  issn         = {1873-5584},
  keyword      = {H-2 reduction,PdAg alloy,Surface oxide,Pd75Ag25(100),Photoelectron,spectroscopy},
  language     = {eng},
  pages        = {794--803},
  publisher    = {Elsevier},
  series       = {Applied Surface Science},
  title        = {H-2 reduction of surface oxides on Pd-based membrane model systems - The case of Pd(100) and Pd75Ag25(100)},
  url          = {http://dx.doi.org/10.1016/j.apsusc.2014.06.077},
  volume       = {313},
  year         = {2014},
}