H-2 reduction of surface oxides on Pd-based membrane model systems - The case of Pd(100) and Pd75Ag25(100)
(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:
https://lup.lub.lu.se/record/4648850
- author
- Fernandes, V. R. ; Gustafson, Johan LU ; Farstad, M. H. ; Walle, L. E. ; Blomberg, Sara LU ; Lundgren, Edvin LU ; Venvik, H. J. and Borg, A.
- organization
- publishing date
- 2014
- 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
- 2016-04-01 10:11:59
- date last changed
- 2022-04-06 13:23:49
@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}}, keywords = {{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}}, doi = {{10.1016/j.apsusc.2014.06.077}}, volume = {{313}}, year = {{2014}}, }