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In situ electrochemical observation of anisotropic lattice contraction of La(0.6)Sr(0.4)FeO(3−δ) electrodes during pulsed laser deposition
La(0.6)Sr(0.4)FeO(3−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 pris...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9768847/ https://www.ncbi.nlm.nih.gov/pubmed/36476841 http://dx.doi.org/10.1039/d2cp04977e |
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author | Riedl, Christoph Siebenhofer, Matthäus Ražnjević, Sergej Bumberger, Andreas Ewald Zhang, Zaoli Limbeck, Andreas Opitz, Alexander Karl Kubicek, Markus Fleig, Jürgen |
author_facet | Riedl, Christoph Siebenhofer, Matthäus Ražnjević, Sergej Bumberger, Andreas Ewald Zhang, Zaoli Limbeck, Andreas Opitz, Alexander Karl Kubicek, Markus Fleig, Jürgen |
author_sort | Riedl, Christoph |
collection | PubMed |
description | La(0.6)Sr(0.4)FeO(3−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 La(0.95)Sr(0.05)Ga(0.95)Mg(0.05)O(3−δ) (LSGM) single crystals or YSZ single crystals with a 5 nm buffer-layer of Gd(0.2)Ce(0.8)O(2−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. |
format | Online Article Text |
id | pubmed-9768847 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-97688472023-01-04 In situ electrochemical observation of anisotropic lattice contraction of La(0.6)Sr(0.4)FeO(3−δ) electrodes during pulsed laser deposition Riedl, Christoph Siebenhofer, Matthäus Ražnjević, Sergej Bumberger, Andreas Ewald Zhang, Zaoli Limbeck, Andreas Opitz, Alexander Karl Kubicek, Markus Fleig, Jürgen Phys Chem Chem Phys Chemistry La(0.6)Sr(0.4)FeO(3−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 La(0.95)Sr(0.05)Ga(0.95)Mg(0.05)O(3−δ) (LSGM) single crystals or YSZ single crystals with a 5 nm buffer-layer of Gd(0.2)Ce(0.8)O(2−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. The Royal Society of Chemistry 2022-12-01 /pmc/articles/PMC9768847/ /pubmed/36476841 http://dx.doi.org/10.1039/d2cp04977e Text en This journal is © the Owner Societies https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Riedl, Christoph Siebenhofer, Matthäus Ražnjević, Sergej Bumberger, Andreas Ewald Zhang, Zaoli Limbeck, Andreas Opitz, Alexander Karl Kubicek, Markus Fleig, Jürgen In situ electrochemical observation of anisotropic lattice contraction of La(0.6)Sr(0.4)FeO(3−δ) electrodes during pulsed laser deposition |
title |
In situ electrochemical observation of anisotropic lattice contraction of La(0.6)Sr(0.4)FeO(3−δ) electrodes during pulsed laser deposition |
title_full |
In situ electrochemical observation of anisotropic lattice contraction of La(0.6)Sr(0.4)FeO(3−δ) electrodes during pulsed laser deposition |
title_fullStr |
In situ electrochemical observation of anisotropic lattice contraction of La(0.6)Sr(0.4)FeO(3−δ) electrodes during pulsed laser deposition |
title_full_unstemmed |
In situ electrochemical observation of anisotropic lattice contraction of La(0.6)Sr(0.4)FeO(3−δ) electrodes during pulsed laser deposition |
title_short |
In situ electrochemical observation of anisotropic lattice contraction of La(0.6)Sr(0.4)FeO(3−δ) electrodes during pulsed laser deposition |
title_sort | in situ electrochemical observation of anisotropic lattice contraction of la(0.6)sr(0.4)feo(3−δ) electrodes during pulsed laser deposition |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9768847/ https://www.ncbi.nlm.nih.gov/pubmed/36476841 http://dx.doi.org/10.1039/d2cp04977e |
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