Silver (Ag) as anode and cathode current collectors in high temperature planar solid oxide fuel cells |
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Authors: | K. Channa R. De SilvaBrian J. Kaseman David J. Bayless |
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Affiliation: | Ohio Coal Research Center, Stocker 248, Ohio University, Athens, OH 45701, United States |
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Abstract: | Planar electrolyte supported solid oxide fuel cells were operated at 900 °C with humidified H2 for 200 h using silver mesh and paste for cathode current collection. Continuous potentiostatic tests at 0.7 V appeared to induce migration of Ag towards electrode-electrolyte interphase, while continuous OCV tests caused no mass transport. Similar SOFCs fueled by coal syngas at 850 °C using Ag for both anode and cathode current collection indicated little, if any, Ag migration; providing the possibility of employing Ag for 100 h laboratory scale tests using coal-derived syngas. Use of high temperature steam, carbon dioxide and carbon monoxide did not result in the formation of silver carbonates. |
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Keywords: | Solid oxide fuel cells (SOFCs) Silver (Ag) Current collectors Thermo-electro migration Coal syngas |
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