Electrochemical impedance study of the poisoning behaviour of Ni-based anodes at low concentrations of H2S in an MCFC
| Autor: | Viviana Cigolotti, Anna Moreno, Igor Luisetto, F. Zaza, A. La Barbera, Hary Devianto, C. Paoletti, Elena Simonetti, Stephen J. McPhail |
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| Přispěvatelé: | Devianto, H., Simonetti, Elena, Mcphail, S. J., Zaza, Fabio, Cigolotti, V., Paoletti, C., Moreno, Anna, La Barbera, A., Luisetto, Igor |
| Rok vydání: | 2012 |
| Předmět: |
Cerium oxide
EIS Materials science Renewable Energy Sustainability and the Environment Inorganic chemistry Metallurgy Oxide Energy Engineering and Power Technology MCFC Condensed Matter Physic engineering.material Condensed Matter Physics Electrochemistry Dip-coating Dielectric spectroscopy Anode chemistry.chemical_compound Ceria Fuel Technology chemistry Coating Molten carbonate fuel cell H2S poisoning engineering |
| Zdroj: | International Journal of Hydrogen Energy. 37:19312-19318 |
| ISSN: | 0360-3199 |
| Popis: | The effect was investigated of low H2S concentrations, simulating biogas impurity, on the poisoning behaviour of a Ni-based, molten carbonate fuel cell anode. A conventional Ni-Cr anode was coated with ceria using dip coating to form a rare earth metal oxide thin layer on the surface of the anode. Electrochemical studies of the Ni-based samples were performed in symmetric cells under anode atmosphere (H2, CO2, H 2O and N2 as balance) with 2, 6, 12, and 24 ppm of H 2S by means of electrochemical impedance spectroscopy. The recorded data showed that the poisoning resistance was enhanced at low coating percentages of ceria; effects depend on H2S concentration and the applied load. These results were confirmed by electrochemical impedance tests where the cerium oxide addition appears through stable polarization behaviour up to 6 ppm of H2S, particularly in the mass transfer region. The protection is explained by the depression of poisoned Ni active sites and formation of a protective layer to the metal surface. The ceria coating layer is a potential solution to reduce H2S poisoning of MCFCs fuelled with biogas. Copyright © 2012, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. |
| Databáze: | OpenAIRE |
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