This title appears in the Scientific Report :
2022
Please use the identifier:
http://hdl.handle.net/2128/31417 in citations.
Please use the identifier: http://dx.doi.org/10.1016/j.ssi.2022.115959 in citations.
Characterization of Y and Mn co-substituted BaZrO3 ceramics: Material properties as a function of the substituent concentration
Characterization of Y and Mn co-substituted BaZrO3 ceramics: Material properties as a function of the substituent concentration
Innovations in materials science are the key element for solving technological challenges. Various energy and environmental applications require designing materials with tailored compositions, microstructures and specific target-oriented performance. Y and Mn co-substituted BaZrO3, e.g. BaZr0.85Y0.1...
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Personal Name(s): | Balaguer, Maria (Corresponding author) |
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Sohn, Yoo Jung / Kobertz, Dietmar / Kasatikov, Sergey / Fantin, Andrea / Müller, Michael / Menzler, Norbert H. / Guillon, Olivier / Ivanova, Mariya (Corresponding author) | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | Solid state ionics, 382 (2022) S. 115959 - |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2022
|
DOI: |
10.1016/j.ssi.2022.115959 |
Document Type: |
Journal Article |
Research Program: |
Solid Oxide Fuel Cell Electrochemistry for Hydrogen |
Link: |
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Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1016/j.ssi.2022.115959 in citations.
Innovations in materials science are the key element for solving technological challenges. Various energy and environmental applications require designing materials with tailored compositions, microstructures and specific target-oriented performance. Y and Mn co-substituted BaZrO3, e.g. BaZr0.85Y0.15Mn0.05O3-δ, has previously attracted attention as a membrane material for H2 separation from gas mixtures due to its mixed proton-electron conductivity leading to appreciable levels of H2-flux at elevated temperatures and its good thermo-chemical stability under reducing environments. In the present work, we developed ceramic materials within the BaZr0.8Y0.2-xMnxO3-δ series, where x = 0.02–0.15. The study of their functional properties in dependence of the Y-to-Mn ratio disclosed that thermal expansion and hydration decrease by increasing the Mn content as well as the total electrical conductivity. In addition to that, XPS analysis and near edge X-ray absorption fine structure spectra (NEXAFS) in the vicinity of O K-edge and Mn L2,3-edges indicated that the Mn atoms oxidation state in the surface and in the bulk range from Mn2+ to Mn4+ depending on the ambient conditions that can be encountered in MPEC electrodes, which it is suggested to be related with a hydration mechanism mediated by Mn oxidation and subsequent proton attachment to oxygen neighbors, similar to LSM. |