Journal article
A depth-resolved in-situ study of the reduction and oxidation of Ni-based anodes in solid oxide fuel cells
The stability of Ni-YSZ anodes as part of solid oxide fuel cells (SOFCs) towards redox cycling is an important issue for successfully introducing the technology. Detailed knowledge of the NiO-Ni transitions and their impact on the mechanical integrity of the whole system is necessary to improve the overall stability.
In the present paper, a unique in-situ X-ray diffraction setup is presented which allows monitoring of the local structural changes during processing of SOFCs. With this setup technological SOFCs – a half cell and a full cell – were studied with respect to NiO-Ni transitions in repeated reduction-oxidation cycles, under conditions relevant for SOFC application.
It was found that the redox kinetics is a function of the sample depth. Ni particles further away from the surface were reduced/oxidized at a slower rate than particles close to the surface.
Language: | English |
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Publisher: | WILEY-VCH Verlag |
Year: | 2006 |
Pages: | 361-366 |
ISSN: | 16156854 and 16156846 |
Types: | Journal article |
DOI: | 10.1002/fuce.200600004 |
ORCIDs: | Hagen, A. , Poulsen, H.F. and 0000-0002-7963-3649 |