Alternating-Current Electrophoretic Deposition of Spinel Coatings on Porous Metallic Substrates for Solid Oxide Fuel Cell Applications

The performance of solid oxide fuel cells (SOFCs) can be degraded by “chromium poisoning” where thermally grown Cr 2 O 3 on metallic surfaces forms volatile Cr-containing species that are redeposited on active regions of the cathode. This phenomenon is further exacerbated for porous metallic interco...

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Bibliographic Details
Published in:JOM (1989) 2021-09, Vol.73 (9), p.2764-2770
Main Authors: Zhu, Zhikuan, Pal, Uday, Gopalan, Srikanth, Hussain, A. Mohammed, Dong, Song, Dale, Nilesh, Fukuyama, Yosuke, Basu, Soumendra
Format: Article
Language:English
Subjects:
Alloys
Alternating current
Chemistry/Food Science
Chromium
Densification
Earth Sciences
Electrodes
Electrophoretic coating
Electrophoretic deposition
Engineering
Environment
Ethanol
Heat treatment
Nanomaterials and Composites for Energy Conversion and Storage
Oxidation
Oxidation resistance
Oxidation tests
Performance evaluation
Physics
Poisoning
Power supply
Protective coatings
Scanning electron microscopy
Solid oxide fuel cells
Spinel
Stainless steel
Substrates
Temperature
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Summary:The performance of solid oxide fuel cells (SOFCs) can be degraded by “chromium poisoning” where thermally grown Cr 2 O 3 on metallic surfaces forms volatile Cr-containing species that are redeposited on active regions of the cathode. This phenomenon is further exacerbated for porous metallic interconnects and metal-supported electrodes due to their large surface-to-volume ratios. In this study, electrophoretic deposition (EPD) of CuNi 0.2 Mn 1.8 O 4 spinel powders on porous SUS430 metallic substrates using alternating current (AC) was explored. Two-step densification heat treatment was used to form a thin, uniform, protective spinel coating. The area-specific resistance (ASR) and weight gain were tracked during 100-h oxidation tests at 700°C in air. The results showed that, despite the considerable complexity of the sample shape, AC EPD was able to form a protective coating layer that significantly limited the growth rate of the thermally grown oxide (TGO) by reducing the k g value by a factor of 25.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-021-04763-2