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Electrochemical Investigation of Nickel Pattern Electrodes in H-2/H2O and CO/CO2 Atmospheres

Ehn, Andreas LU ; Hogh, J.; Graczyk, Mariusz LU ; Norrman, K.; Montelius, Lars LU ; Linne, M. and Mogensen, M. (2010) In Journal of the Electrochemical Society 157(11). p.1588-1596
Abstract
In this study, nickel pattern electrodes were electrochemically investigated in a three-electrode setup, operating both with H-2/H2O and CO/CO2 atmospheres. Heating introduced structural differences in the nickel layer among the pattern electrodes, which appear to affect the electrode performance. Both dense and porous nickel pattern electrodes were formed by heating. Holes appeared in the nickel layer of the porous pattern electrodes, where the open cavity triple phase boundaries exhibited different limiting processes than open triple phase boundary electrodes of the dense electrode. As the temperature was raised in the experiment, the electrodes stabilized, with a degraded behavior that seemed to be strongly coupled to the structural... (More)
In this study, nickel pattern electrodes were electrochemically investigated in a three-electrode setup, operating both with H-2/H2O and CO/CO2 atmospheres. Heating introduced structural differences in the nickel layer among the pattern electrodes, which appear to affect the electrode performance. Both dense and porous nickel pattern electrodes were formed by heating. Holes appeared in the nickel layer of the porous pattern electrodes, where the open cavity triple phase boundaries exhibited different limiting processes than open triple phase boundary electrodes of the dense electrode. As the temperature was raised in the experiment, the electrodes stabilized, with a degraded behavior that seemed to be strongly coupled to the structural changes in the electrode. It was possible to compare literature results with high temperature impedance measurements in H-2/H2O presented here, while new results at lower temperatures in H-2/H2O are also presented. Impedance spectroscopy measurements were performed, and the gas dependence of the polarization resistance was observed as the mixture ratios and temperatures were varied in both atmospheres. A positive relation between the polarization resistance and the partial pressure of CO was determined for the dense nickel pattern electrode, which agrees with previous results using nickel point electrodes. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3484091] All rights reserved. (Less)
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author
organization
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type
Contribution to journal
publication status
published
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in
Journal of the Electrochemical Society
volume
157
issue
11
pages
1588 - 1596
publisher
The Electrochemical Society
external identifiers
  • wos:000283857900037
  • scopus:77957721702
ISSN
0013-4651
DOI
10.1149/1.3484091
language
English
LU publication?
yes
id
3c75aef3-7b1e-4c5d-9da9-6cfe9e7b58cc (old id 1752133)
date added to LUP
2010-12-29 17:58:25
date last changed
2018-06-24 03:06:41
@article{3c75aef3-7b1e-4c5d-9da9-6cfe9e7b58cc,
  abstract     = {In this study, nickel pattern electrodes were electrochemically investigated in a three-electrode setup, operating both with H-2/H2O and CO/CO2 atmospheres. Heating introduced structural differences in the nickel layer among the pattern electrodes, which appear to affect the electrode performance. Both dense and porous nickel pattern electrodes were formed by heating. Holes appeared in the nickel layer of the porous pattern electrodes, where the open cavity triple phase boundaries exhibited different limiting processes than open triple phase boundary electrodes of the dense electrode. As the temperature was raised in the experiment, the electrodes stabilized, with a degraded behavior that seemed to be strongly coupled to the structural changes in the electrode. It was possible to compare literature results with high temperature impedance measurements in H-2/H2O presented here, while new results at lower temperatures in H-2/H2O are also presented. Impedance spectroscopy measurements were performed, and the gas dependence of the polarization resistance was observed as the mixture ratios and temperatures were varied in both atmospheres. A positive relation between the polarization resistance and the partial pressure of CO was determined for the dense nickel pattern electrode, which agrees with previous results using nickel point electrodes. (C) 2010 The Electrochemical Society. [DOI: 10.1149/1.3484091] All rights reserved.},
  author       = {Ehn, Andreas and Hogh, J. and Graczyk, Mariusz and Norrman, K. and Montelius, Lars and Linne, M. and Mogensen, M.},
  issn         = {0013-4651},
  language     = {eng},
  number       = {11},
  pages        = {1588--1596},
  publisher    = {The Electrochemical Society},
  series       = {Journal of the Electrochemical Society},
  title        = {Electrochemical Investigation of Nickel Pattern Electrodes in H-2/H2O and CO/CO2 Atmospheres},
  url          = {http://dx.doi.org/10.1149/1.3484091},
  volume       = {157},
  year         = {2010},
}