Journal article
Determination of redox-active centers in praseodymium doped ceria by in situ-XANES spectroscopy
Department of Energy Conversion and Storage, Technical University of Denmark1
Mixed Conductors, Department of Energy Conversion and Storage, Technical University of Denmark2
Fundamental Electrochemistry, Department of Energy Conversion and Storage, Technical University of Denmark3
Applied Electrochemistry, Department of Energy Conversion and Storage, Technical University of Denmark4
Praseodymium doped ceria, a material of interest for electrochemical flue gas purification, was investigated with in situ X-ray Absorption Near Edge Structure spectroscopy between room temperature and 500°C in air and diluted nitrogen(II) oxide (NO/Ar) (1% NO in Ar). For temperatures above 400°C in NO/Ar a reversible energy shift towards lower energy was observed for the Pr edge, indicating a reduction of Pr4+ to Pr3+, while the edge position of Ce remained unchanged.
The concentration of Pr3+ ions was quantified and obtained results are in good agreement with predictions from defect thermodynamic modeling.
| Language: | English |
|---|---|
| Year: | 2012 |
| Pages: | 80-83 |
| ISSN: | 18734448 and 00092614 |
| Types: | Journal article |
| DOI: | 10.1016/j.cplett.2012.04.009 |
| ORCIDs: | Kiebach, Wolff-Ragnar , Chatzichristodoulou, Christodoulos , Werchmeister, Rebecka Maria Larsen and Hagen, Anke |
