SrZr0.9Y0.1O3−δ thin films by in-situ synthesis of triple alkoxide for protonic ceramic electrolyser membranes
[EN] Synthesis of the proton-conducting electrolyte SrZrYO(SZY) was undertaken by the sol–gel method employing an all-alkoxide route from reaction of strontium alkoxide produced in-situ and commercial zirconium and yttrium alkoxides. The solution was homogenized by a previous ligand exchange in 2-me...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión aceptada para publicación |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/275101 |
| Acceso en línea: | http://hdl.handle.net/10261/275101 |
| Access Level: | acceso abierto |
| Palabra clave: | Triple metal alkoxide Strontium zirconate Proton conductor Protonic ceramic electrolyser Thin-film |
| Sumario: | [EN] Synthesis of the proton-conducting electrolyte SrZrYO(SZY) was undertaken by the sol–gel method employing an all-alkoxide route from reaction of strontium alkoxide produced in-situ and commercial zirconium and yttrium alkoxides. The solution was homogenized by a previous ligand exchange in 2-methoxyethanol to control the polycondensation rate and achieve SZY at the low final firing temperature of 700–800 °C. SZY thin films (~270 nm) were assisted by dip-coating on different substrates and characterized by scanning and transmission electron microscopy, grazing X-ray diffraction and confocal micro-Raman spectroscopy, revealing well-crystallized SZY phase with orthorhombic symmetry (space group, Pnma). Impedance spectroscopy of a thin film deposited on a quartz substrate revealed that protons contribute to transport in wet conditions as confirmed by a lower conductivity in DO-humidified air (1.02 eV) compared to HO-wetted air (0.99 eV), with the difference in activation energy consistent with a conductive isotope effect. [Figure not available: see fulltext.]. |
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