Home > Publications database > Self-healing atmospheric plasma sprayed Mn 1.0 Co 1.9 Fe 0.1 O 4 protective interconnector coatings for solid oxide fuel cells > print

001     837607
005     20240711085705.0
024 7 _ |a 10.1016/j.jpowsour.2017.07.072
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024 7 _ |a 0378-7753
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024 7 _ |a 1873-2755
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024 7 _ |a 2128/15285
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037 _ _ |a FZJ-2017-06486
082 _ _ |a 620
100 1 _ |a Grünwald, Nikolas
|0 P:(DE-Juel1)165868
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|e Corresponding author
245 _ _ |a Self-healing atmospheric plasma sprayed Mn 1.0 Co 1.9 Fe 0.1 O 4 protective interconnector coatings for solid oxide fuel cells
260 _ _ |a New York, NY [u.a.]
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520 _ _ |a Dense coatings on metallic interconnectors are necessary to suppress chromium poisoning of SOFC cathodes. Atmospherically plasma sprayed (APS) Mn1.0Co1.9Fe0.1O4 (MCF) protective layers demonstrated reduced chromium related degradation in laboratory and stack tests. Previous analyses revealed strong microstructural changes comparing the coating's as-sprayed and operated condition. This work concentrates on the layer-densification and crack-healing observed by annealing APS-MCF in air, which simulates the cathode operation conditions. The effect is described by a volume expansion induced by a phase transformation. Reducing conditions during the spray process lead to a deposition of the MCF in a metastable rock salt configuration. Annealing in air activates diffusion processes for a phase transformation to the low temperature stable spinel phase (T < 1050 °C). This transformation is connected to an oxygen incorporation which occurs at regions facing high oxygen partial pressures, as there are the sample surface, cracks and pore surfaces. Calculations reveal a volume expansion induced by the oxygen uptake which seals the cracks and densifies the coating. The process decelerates when the cracks are closed, as the gas route is blocked and further oxidation continues over solid state diffusion. The self-healing abilities of metastable APS coatings could be interesting for other applications.
536 _ _ |a 135 - Fuel Cells (POF3-135)
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536 _ _ |a SOFC - Solid Oxide Fuel Cell (SOFC-20140602)
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|c SOFC-20140602
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536 _ _ |0 G:(DE-Juel1)HITEC-20170406
|x 2
|c HITEC-20170406
|a HITEC - Helmholtz Interdisciplinary Doctoral Training in Energy and Climate Research (HITEC) (HITEC-20170406)
588 _ _ |a Dataset connected to CrossRef
700 1 _ |a Sebold, Doris
|0 P:(DE-Juel1)129662
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700 1 _ |a Sohn, Yoo Jung
|0 P:(DE-Juel1)159368
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700 1 _ |a Menzler, Norbert H.
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700 1 _ |a Vaßen, Robert
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773 _ _ |a 10.1016/j.jpowsour.2017.07.072
|g Vol. 363, p. 185 - 192
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|t Journal of power sources
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