| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Harrington, George
RWTH Aachen University
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2023Artificial p–n‐like Junction Based on Pure 2D Organic–Inorganic Halide Perovskite Structure Having Naphthalene Diimide Acceptor Moietiescitations
- 2023Revisiting point defects in ionic solids and semiconductorscitations
- 2023Revisiting point defects in ionic solids and semiconductorscitations
- 2021Heteroepitaxial Hexagonal (00.1) CuFeO2 Thin Film Grown on Cubic (001) SrTiO3 Substrate Through Translational and Rotational Domain Matchingcitations
- 2020Anisotropic Strain in Rare-Earth Substituted Ceria Thin Films Probed by Polarized Raman Spectroscopy and First-Principles Calculationscitations
- 2020Thickness-dependent microstructural properties of heteroepitaxial (00.1) CuFeO2 thin films on (00.1) sapphire by pulsed laser depositioncitations
- 2019Emergence of Rapid Oxygen Surface Exchange Kinetics during in Situ Crystallization of Mixed Conducting Thin Film Oxidescitations
- 2018Durability of template-free Fe-N-C foams for electrochemical oxygen reduction in alkaline solutioncitations
- 2017Relating microstructure to surface exchange kinetics using in situ optical absorption relaxationcitations
- 2017Impact of microstructure and crystallinity on surface exchange kinetics of strontium titanium iron oxide perovskite bycitations
- 2017Design of Sr0.7R0.3CoO3-δ(R = Tb and Er) Perovskites Performing as Cathode Materials in Solid Oxide Fuel Cellscitations
- 2014Chemistry and structure of homoepitaxial SrTiO3 films and their influence on oxide-heterostructure interfacescitations
Places of action
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article
Emergence of Rapid Oxygen Surface Exchange Kinetics during in Situ Crystallization of Mixed Conducting Thin Film Oxides
Abstract
<p>The oxygen surface exchange kinetics of mixed ionic and electronic conducting oxides (MIECs) play a critical role in the efficiency of intermediate-to-high-temperature electrochemical devices. Although there is increasing interest in low-temperature preparation of MIEC thin films, the impact of the resultant varied degrees of crystallinity on the surface exchange kinetics has not been widely investigated. Here, we probe the effect of crystallization on oxygen surface exchange kinetics in situ, by applying an optical transmission relaxation (OTR) approach during annealing of amorphous films. OTR enables contact-free, in situ, and continuous quantification of the oxygen surface exchange coefficient (k<sub>chem</sub>); we previously applied it to Pr<sub>x</sub>Ce<sub>1-x</sub>O<sub>2-δ</sub>and SrTi<sub>1-x</sub>Fe<sub>x</sub>O<sub>3-δ</sub>thin films. In this work, the OTR approach was successfully extended to other mixed conducting thin film compositions for the first time (i.e., perovskite SrTi<sub>0.65</sub>Co<sub>0.35</sub>O<sub>3-δ</sub>and Ruddlesden-Popper Sr<sub>2</sub>Ti<sub>0.65</sub>Fe<sub>0.35</sub>O<sub>4±δ</sub>), as well as to Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2-δ</sub>, enabling quantification of the k<sub>chem</sub>of their native surfaces and comparison of the behavior of films with different final crystal structures. All thin films were prepared by pulsed laser deposition at 25 or 700-800 °C and subject to subsequent thermal treatments with simultaneous OTR monitoring of k<sub>chem</sub>. The surface roughness, grain size, and crystallinity were evaluated by scanning probe microscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. Fluorite Pr<sub>0.1</sub>Ce<sub>0.9</sub>O<sub>2-δ</sub>films grown at 25 °C did not exhibit an increase in k<sub>chem</sub>after annealing, as they were already crystalline as grown at 25 °C. For all other compositions, OTR enabled in situ observation of both the crystallization process and the emergence of rapid surface exchange kinetics immediately upon crystallization. Perovskite SrTi<sub>0.65</sub>Co<sub>0.35</sub>O<sub>3-δ</sub>and Ruddlesden-Popper Sr<sub>2</sub>Ti<sub>0.65</sub>Fe<sub>0.35</sub>O<sub>4±δ</sub>thin films grown at 25 °C exhibited at least 1-2 orders of magnitude enhanced k<sub>chem</sub>after annealing compared with highly crystalline thin films grown at 800 °C, indicating the benefits of in situ crystallization.</p>