Long-Term Oxygen Exchange Kinetics of Nd[sub 2]NiO[sub 4+δ] in H[sub 2]O- and CO[sub 2]-Containing Atmospheres
| Autor: | A. Egger, Werner Sitte, E. Bertel, F. Klauser |
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| Rok vydání: | 2010 |
| Předmět: |
Renewable Energy
Sustainability and the Environment Chemistry Inorganic chemistry Non-blocking I/O Analytical chemistry chemistry.chemical_element Condensed Matter Physics Oxygen Surfaces Coatings and Films Electronic Optical and Magnetic Materials Atmosphere X-ray photoelectron spectroscopy Materials Chemistry Electrochemistry Degradation (geology) Solid oxide fuel cell Relative humidity Order of magnitude |
| Zdroj: | Journal of The Electrochemical Society. 157:B1537 |
| ISSN: | 0013-4651 |
| DOI: | 10.1149/1.3481420 |
| Popis: | The degradation of the solid oxide fuel cell cathode material Nd 2 NiO 4+δ with respect to the oxygen exchange kinetics in H 2 O- and CO 2 -containing atmospheres has been investigated at 700°C. The material exhibits excellent stability in dry Ar + 1% O 2 atmosphere over 1000 h. No appreciable degradation has been observed after exposure to a CO 2 -rich atmosphere, but a decrease in the chemical surface exchange coefficient of oxygen by 1 order of magnitude has been found after 1000 h under moist conditions (30% relative humidity). Post-test X-ray photoelectron spectroscopy depth analysis showed significant changes in the Nd:Ni cation ratio within the topmost 100 nm of the H 2 O-degraded sample. It is concluded that the degradation mechanism involves hydroxides as intermediate species even if the predominant species in the degraded surface is NdNiO 3 . |
| Databáze: | OpenAIRE |
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