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<div class="csl-entry">Riedl, C., Siebenhofer, M., Ražnjević, S., Bumberger, A. E., Zhang, Z., Limbeck, A., Opitz, A. K., Kubicek, M., & Fleig, J. (2023). In situ electrochemical observation of anisotropic lattice contraction of La₀.₆Sr₀.₄FeO₃-δ electrodes during pulsed laser deposition. <i>Physical Chemistry Chemical Physics</i>, <i>25</i>(1), 142–153. https://doi.org/10.1039/d2cp04977e</div>
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dc.identifier.issn
1463-9076
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/189254
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dc.description.abstract
La0.6Sr0.4FeO3-δ (LSF) electrodes were grown on different electrolyte substrates by pulsed laser deposition (PLD) and their oxygen exchange reaction (OER) resistance was tracked in real-time by in situ PLD impedance spectroscopy (i-PLD) inside the PLD chamber. This enables measurements on pristine surfaces free from any contaminations and the direct observation of thickness dependent properties. As substrates, yttria-stabilized zirconia single crystals (YSZ) were used for polycrystalline LSF growth and La0.95Sr0.05Ga0.95Mg0.05O3-δ (LSGM) single crystals or YSZ single crystals with a 5 nm buffer-layer of Gd0.2Ce0.8O2-δ for epitaxial LSF film growth. While polycrystalline LSF electrodes show a constant OER resistance in a broad thickness range, epitaxially grown LSF electrodes exhibit a continuous and strong increase of the OER resistance with film thickness until ≈60 nm. In addition, the activation energy of the OER resistance increases by 0.23 eV compared to polycrystalline LSF. High resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) measurements reveal an increasing contraction of the out-of-plane lattice parameter in the epitaxial LSF electrodes over electrode thickness. Defect thermodynamic simulations suggest that the decrease of the LSF unit cell volume is accompanied by a lowering of the oxygen vacancy concentration, explaining both the resistive increase and the increased activation energy.
en
dc.language.iso
en
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dc.publisher
ROYAL SOC CHEMISTRY
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dc.relation.ispartof
Physical Chemistry Chemical Physics
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dc.subject
electrochmeical observation
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dc.subject
Pulsed Laser Deposition
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dc.subject
anisotropic lattice contraction
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dc.title
In situ electrochemical observation of anisotropic lattice contraction of La₀.₆Sr₀.₄FeO₃-δ electrodes during pulsed laser deposition