Electronic and structural properties of La0.4Sr 0.6Ti1-yCoyO3±δ electrode materials for symmetric SOFC studied by hard X-ray absorption spectroscopy
Research output: Contribution to journal › Research article › Contributed › peer-review
Contributors
Abstract
We present combined Synchrotron X-ray Absorption Near Edge Spectroscopy (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) study of La 0.4Sr0.6Ti1-yCoyO 3±δ (0 ≤ y ≤ 0.5), which are promising electrode materials for symmetric solid oxide fuel cells. The measurements were performed at room temperature at the Ti and the Co K-edges in order to determine the local structural and electronic changes around the two transition metals. We find that Ti remains in a higher formal valence (around 4+) independent of the Co concentration. In contrast to this, dramatic and systematic changes are observed for the Co as a function of y. We conclude that the stability of the Ti 4+ triggers the A-site deficiency in our samples and predicts that oxygen vacancies are much more easily formed at large Co content, which in turn will greatly enhance the performance as electrode material.
Details
Original language | English |
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Pages (from-to) | 8965-8973 |
Number of pages | 9 |
Journal | International journal of hydrogen energy |
Volume | 38 |
Issue number | 21 |
Publication status | Published - 17 Jul 2013 |
Peer-reviewed | Yes |
External IDs
ORCID | /0000-0002-2438-0672/work/159172170 |
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Keywords
Sustainable Development Goals
ASJC Scopus subject areas
Keywords
- EXAFS, LSTC, Symmetrical SOFC electrode, XANES