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Effect of stress on NiO reduction in solid oxide fuel cells: a new application of energy-resolved neutron imaging

Makowska, Malgorzata G.; Strobl, Markus LU ; Lauridsen, Erik M.; Frandsen, Henrik L.; Tremsin, Anton S.; Kardjilov, Nikolay; Manke, Ingo; Kelleher, Joe F. and Kuhn, Luise Theil (2015) In Journal of Applied Crystallography 48. p.401-408
Abstract
Recently, two new phenomena linking stress field and reduction rates in anode-supported solid oxide fuel cells (SOFCs) have been demonstrated, so-called accelerated creep during reduction and reduction rate enhancement and nucleation due to stress (Frandsen et al., 2014). These complex phenomena are difficult to study and it is demonstrated here that energy-resolved neutron imaging is a feasible technique for combined mechanics-chemical composition studies of SOFC components, including commercially produced ones. Cermet anode supports, which prior to the measurements were reduced under varying conditions such as different temperatures, various times and different values of applied stress, have been measured. Thus, samples with different... (More)
Recently, two new phenomena linking stress field and reduction rates in anode-supported solid oxide fuel cells (SOFCs) have been demonstrated, so-called accelerated creep during reduction and reduction rate enhancement and nucleation due to stress (Frandsen et al., 2014). These complex phenomena are difficult to study and it is demonstrated here that energy-resolved neutron imaging is a feasible technique for combined mechanics-chemical composition studies of SOFC components, including commercially produced ones. Cermet anode supports, which prior to the measurements were reduced under varying conditions such as different temperatures, various times and different values of applied stress, have been measured. Thus, samples with different contents (and gradients) of Ni and NiO phases were investigated. The first Bragg edge transmission neutron measurements applied for the studies of the reduction progress in these samples were performed at two neutron beamline facilities (ISIS in the UK, Helmholtz Zentrum Berlin in Germany). The obtained results demonstrate the possibility to image and distinguish NiO and Ni phases within SOFC anode supports by energy-resolved neutron imaging and the potential of the neutron imaging method for in situ studies of reduction processes. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
solid oxide fuel cells, reduction processes, stress, energy-resolved, neutron imaging
in
Journal of Applied Crystallography
volume
48
pages
401 - 408
publisher
Wiley-Blackwell
external identifiers
  • wos:000352229100011
  • scopus:84926382408
ISSN
1600-5767
DOI
10.1107/S1600576715002794
language
English
LU publication?
yes
id
a4b25c0a-9923-40f3-9c34-cc26928ee9d6 (old id 5402921)
date added to LUP
2015-05-19 14:26:24
date last changed
2017-01-08 03:02:26
@article{a4b25c0a-9923-40f3-9c34-cc26928ee9d6,
  abstract     = {Recently, two new phenomena linking stress field and reduction rates in anode-supported solid oxide fuel cells (SOFCs) have been demonstrated, so-called accelerated creep during reduction and reduction rate enhancement and nucleation due to stress (Frandsen et al., 2014). These complex phenomena are difficult to study and it is demonstrated here that energy-resolved neutron imaging is a feasible technique for combined mechanics-chemical composition studies of SOFC components, including commercially produced ones. Cermet anode supports, which prior to the measurements were reduced under varying conditions such as different temperatures, various times and different values of applied stress, have been measured. Thus, samples with different contents (and gradients) of Ni and NiO phases were investigated. The first Bragg edge transmission neutron measurements applied for the studies of the reduction progress in these samples were performed at two neutron beamline facilities (ISIS in the UK, Helmholtz Zentrum Berlin in Germany). The obtained results demonstrate the possibility to image and distinguish NiO and Ni phases within SOFC anode supports by energy-resolved neutron imaging and the potential of the neutron imaging method for in situ studies of reduction processes.},
  author       = {Makowska, Malgorzata G. and Strobl, Markus and Lauridsen, Erik M. and Frandsen, Henrik L. and Tremsin, Anton S. and Kardjilov, Nikolay and Manke, Ingo and Kelleher, Joe F. and Kuhn, Luise Theil},
  issn         = {1600-5767},
  keyword      = {solid oxide fuel cells,reduction processes,stress,energy-resolved,neutron imaging},
  language     = {eng},
  pages        = {401--408},
  publisher    = {Wiley-Blackwell},
  series       = {Journal of Applied Crystallography},
  title        = {Effect of stress on NiO reduction in solid oxide fuel cells: a new application of energy-resolved neutron imaging},
  url          = {http://dx.doi.org/10.1107/S1600576715002794},
  volume       = {48},
  year         = {2015},
}