Ohmic resistance of nickel infiltrated chromium oxide scales in solid oxide fuel cell metallic interconnects

Linder, Markus; Hocker, Thomas; Holzer, Lorenz; Pecho, Omar; Friedrich, Andreas; Morawietz, Thomas; Hiesgen, Renate; Kontic, Roman; Iwanschitz, Boris; Mai, Andreas; Schuler, Andreas

doi:10.1016/j.ssi.2015.11.003

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Ohmic resistance of nickel infiltrated chromium oxide scales in solid oxide fuel cell metallic interconnects
Authors:	Linder, Markus Hocker, Thomas Holzer, Lorenz Pecho, Omar Friedrich, Andreas Morawietz, Thomas Hiesgen, Renate Kontic, Roman Iwanschitz, Boris Mai, Andreas Schuler, Andreas
DOI:	10.1016/j.ssi.2015.11.003
Published in:	Solid State Ionics
Volume(Issue):	283
Page(s):	38
Pages to:	51
Issue Date:	2015
Publisher / Ed. Institution:	Elsevier
ISSN:	0167-2738 1872-7689
Language:	English
Subjects:	Interconnect; Oxidation; Map; SOFC
Subject (DDC):	621.3: Electrical, communications, control engineering
Abstract:	Oxide scale formation on metallic interconnects contributes to the overall degradation of solid oxide fuel cell (SOFC) stacks. On the anode side, thermally grown oxide scale might contain additional nickel, nickel oxide, or nickel chromium spinel phases – depending on the applied operation conditions. Ni originates from Ni-meshes, often applied as current collector, from Ni-containing anodes or from Ni-containing coatings. Ni particles released during thermo redox cycles from adjacent Ni-containing components might be interspersed into the oxide scale. This study aims at investigating the influence of Ni on the electrical conductivity of oxide scales. For this purpose pellets of Cr2O3 were mixed with different amounts of Ni and then investigated in-situ under both reducing and oxidizing gas atmospheres at 850°C. The formed crystals were analyzed using X-ray diffraction, whereas the resulting microstructures were quantified using scanning electron microscopy. During oxidation Ni is converted into NiO, and the latter interacts with Cr2O3 to form a NiCr2O4 spinel phase. Subsequent exposure to reducing conditions leads to an almost instantaneous decomposition of NiCr2O4 spinel, resulting in finely dispersed elementary Ni. This rearrangement of Ni by spinel decomposition leads to a significant improvement of the electrical conductivity of the Cr2O3 pellets compared to their initial state.
URI:	https://digitalcollection.zhaw.ch/handle/11475/1622
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP) Institute of Materials and Process Engineering (IMPE)
Appears in collections:	Publikationen School of Engineering

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Linder, M., Hocker, T., Holzer, L., Pecho, O., Friedrich, A., Morawietz, T., Hiesgen, R., Kontic, R., Iwanschitz, B., Mai, A., & Schuler, A. (2015). Ohmic resistance of nickel infiltrated chromium oxide scales in solid oxide fuel cell metallic interconnects. Solid State Ionics, 283, 38–51. https://doi.org/10.1016/j.ssi.2015.11.003

Linder, M. et al. (2015) ‘Ohmic resistance of nickel infiltrated chromium oxide scales in solid oxide fuel cell metallic interconnects’, Solid State Ionics, 283, pp. 38–51. Available at: https://doi.org/10.1016/j.ssi.2015.11.003.

M. Linder et al., “Ohmic resistance of nickel infiltrated chromium oxide scales in solid oxide fuel cell metallic interconnects,” Solid State Ionics, vol. 283, pp. 38–51, 2015, doi: 10.1016/j.ssi.2015.11.003.

LINDER, Markus, Thomas HOCKER, Lorenz HOLZER, Omar PECHO, Andreas FRIEDRICH, Thomas MORAWIETZ, Renate HIESGEN, Roman KONTIC, Boris IWANSCHITZ, Andreas MAI und Andreas SCHULER, 2015. Ohmic resistance of nickel infiltrated chromium oxide scales in solid oxide fuel cell metallic interconnects. Solid State Ionics. 2015. Bd. 283, S. 38–51. DOI 10.1016/j.ssi.2015.11.003

Linder, Markus, Thomas Hocker, Lorenz Holzer, Omar Pecho, Andreas Friedrich, Thomas Morawietz, Renate Hiesgen, et al. 2015. “Ohmic Resistance of Nickel Infiltrated Chromium Oxide Scales in Solid Oxide Fuel Cell Metallic Interconnects.” Solid State Ionics 283: 38–51. https://doi.org/10.1016/j.ssi.2015.11.003.

Linder, Markus, et al. “Ohmic Resistance of Nickel Infiltrated Chromium Oxide Scales in Solid Oxide Fuel Cell Metallic Interconnects.” Solid State Ionics, vol. 283, 2015, pp. 38–51, https://doi.org/10.1016/j.ssi.2015.11.003.