Abstract
Interconnects employed in solid oxide fuel cells require
electrically conductive protective coatings such as those
based on manganese cobalt oxide spinels in order to
prevent evaporation of volatile Cr(VI)-compounds and to
minimize high temperature corrosion. MnCo2-xFexO4 based
(where x = 0.1 and 0.3) oxide spinel protective coatings
were manufactured by the atmospheric plasma spraying
process on Crofer 22 APU substrates. The coated
substrates were oxidized at 700 °C in air for 1000 h and
post-mortem analyses were conducted to study the
performance of the thermal sprayed coatings. During the
high temperature oxidation, a four-point on-line
measurement technique was used for area specific
resistance studies. The MnCo1.7Fe0.3O4 coating was tested
together with the La0.85Sr0.15Mn1.1O3-spacer. The
atmospheric plasma sprayed MnCo2-xFexO4 showed excellent
Cr-barrier properties and decreased oxidation of the
substrate. In addition, resistance as low as 9.20
m{\Omega} cm2 values was obtained after the 1000 h
oxidation cycle. The MnCo1.9Fe0.1O4 coating manufactured
by the atmospheric plasma spraying process is a promising
candidate for SOFC interconnect applications.
Original language | English |
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Pages (from-to) | 17284-17294 |
Journal | International Journal of Hydrogen Energy |
Volume | 39 |
Issue number | 30 |
DOIs | |
Publication status | Published - 2014 |
MoE publication type | A1 Journal article-refereed |
Keywords
- solid oxide fuel cells
- SOFC interconnect
- atmospheric plasma spraying
- spinel coatings
- protective coatings
- area specific resistance
- ProperPart