Reactions at the interface La0.5Ca0.5MnO3-YSZ/Al2O3 under anodic current
| العنوان: | Reactions at the interface La0.5Ca0.5MnO3-YSZ/Al2O3 under anodic current |
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| المؤلفون: | E. Monreal, Detlef Stolten, Andreas Kaiser, A. Koch |
| المصدر: | Ionics. 2:184-189 |
| بيانات النشر: | Springer Science and Business Media LLC, 1996. |
| سنة النشر: | 1996 |
| مصطلحات موضوعية: | Electrolysis, Chemistry, General Chemical Engineering, General Engineering, Analytical chemistry, General Physics and Astronomy, Electrolyte, Electrochemistry, Half-cell, law.invention, Standard electrode potential, law, Electrode, General Materials Science, Polarization (electrochemistry), Polymer electrolyte membrane electrolysis |
| الوصف: | The reaction at the interface of a solid electrolyte cell between air electrode (La0.5Ca0.5MnO3) and YSZ-electrolyte with different Al2O3-contents was investigated by electron microscopy (SEM) and x-ray diffraction (XRD). Formation of MnAl2O4 was detected in a 5 µm diffusion zone within the electrolyte. MnAl2O4 formation can be explained by diffusion of Mn-ions into the electrolyte and subsequent reaction with the α-Al2O3 grains during sintering. Cell performance and long-term stability in SOFC operation are not negatively affected by MnAl2O4 formation. However a rise in electrode resistance and slow delamination of perovskite oxide electrode were observed after some hours of electrolysis. This reaction is the consequence of oxygen gas pressure at the electrolyte in the MnAl2O4 diffusion zone. It is caused by local increase of electronic conductivity by MnAl2O4 formation. Long-term stability also for electrolysis conditions has been achieved by an additional intermediate YSZ-layer between air electrode and electrolyte. |
| تدمد: | 1862-0760 0947-7047 |
| DOI: | 10.1007/bf02376019 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::7bc343689ccadf88c767e62e6fecc5bb https://doi.org/10.1007/bf02376019 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........7bc343689ccadf88c767e62e6fecc5bb |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 18620760 09477047 |
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| DOI: | 10.1007/bf02376019 |