Abstract
The compilation of measured effective rate constants for oxygen surface exchange on mixed conducting perovskites, which covers a great variety of compositions ranging from (La,Sr)MnO 3-δ to (La,Sr)(Co,Fe)O 3-δ and (Ba,Sr)(Co,Fe)O 3-δ, demonstrates the importance of ionic conductivity-i.e., high oxygen vacancy concentration as well as vacancy mobility-as a key factor for the surface oxygen exchange rate. This interpretation is corroborated by ab initio calculations, which indicate that the approach of an oxygen vacancy to oxygen intermediates adsorbed on the surface is the rate determining step for a number of perovskites.
| Original language | English |
|---|---|
| Pages (from-to) | 2000-2008 |
| Number of pages | 9 |
| Journal | Journal of Materials Research |
| Volume | 27 |
| Issue number | 15 |
| DOIs | |
| Publication status | Published - 14 Aug 2012 |
UN SDGs
This output contributes to the following UN Sustainable Development Goals (SDGs)
-
SDG 7 Affordable and Clean Energy
OECD Field of Science
- 1.3 Physical Sciences
Keywords
- ABO perovskites
- mechanism
- point defects
- SOFC
- surface reaction
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