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On the Redox Cycling of Anode-Supported SOFCs: Mechanical Properties and Damage Mechanisms
Investigations on SOFCs using Ni-based anode supports are presented aiming at the understanding of how much oxidation such a cell can tolerate before incurring irreversible mechanical damage. The dimensional strains, elastic modulus and porosity of typical anode supports were measured as a function...
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Main Authors: | , , |
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Format: | Conference Proceeding |
Language: | English |
Citations: | Items that cite this one |
Online Access: | Get full text |
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Summary: | Investigations on SOFCs using Ni-based anode supports are presented aiming at the understanding of how much oxidation such a cell can tolerate before incurring irreversible mechanical damage. The dimensional strains, elastic modulus and porosity of typical anode supports were measured as a function of the degree of oxidation. The mechanical stability of cells incorporating such substrates was studied as a result of oxidation by air and by electrochemical oxidation. The different oxidation procedures performed showed different damage modes. In free-standing cells the main damage mode was electrolyte cracking, but in cell test configurations the cells failed by substrate cracking. This was mainly due to the non-uniform nature of anode oxidation in the cell test configurations which can lead to cell failure when the degree of oxidation is only 5 %. The observations are interpreted using models of the stress generation and fracture processes. |
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ISSN: | 1938-5862 1938-6737 |
DOI: | 10.1149/1.2729254 |