Enhanced Intermediate-Temperature Electrochemical Performance of Air Electrodes for Solid Oxide Cells with Spray-Pyrolyzed Active Layers
| Autor: | David Marrero-López, Domingo Pérez-Coll, Glenn C. Mather, Víctor Zapata-Ramírez, Lucía dos Santos-Gómez |
|---|---|
| Přispěvatelé: | Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), Mather, Glenn Christopher, Pérez-Coll, Domingo, Marrero-López, David, Mather, Glenn Christopher [0000-0003-0779-4619], Pérez-Coll, Domingo [0000-0001-5331-2516], Marrero-López, David [0000-0003-0632-6442] |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Oxide 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences law.invention Spray pyrolysis chemistry.chemical_compound law Intermediate temperature General Materials Science SOFC Mixed conducting properties Spray pyrolysis: Active interlayers Range (particle radiation) 021001 nanoscience & nanotechnology Cathode 0104 chemical sciences Active interlayers [Spray pyrolysis] chemistry Chemical engineering Surface path Electrode 0210 nano-technology Pyrolysis |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 2018-0950 |
| Popis: | The potential of interactive layers of mixed-conducting oxides for improving the performance of air electrodes of solid oxide cells in the intermediate-temperature range is demonstrated. Active layers of CeGdO (CGO), CePrO (CPO), and SrFeMoO (SFM) with thickness in the range 200-400 nm are deposited on CGO-based electrolyte by spray pyrolysis, followed by deposition of a SFM/CGO composite air electrode by painting. The morphologies and phase composition of the active layers are examined by X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy microanalysis. The electrochemical performance of the electrolyte-electrode assemblies is determined by impedance spectroscopy in the range 600-800 °C. Significant improvements in the performance of the electrode process and the geometrically normalized ohmic conductance are observed for the assembly with a CPO active layer with mixed-oxide-ionic-electronic conductivity, especially in the low-temperature range, attributable to extension of the surface path of the electrochemical reactions. The CGO intermediate layer also improves performance but to a lesser degree, most likely due to better ionic-current collection in comparison to the assemblies with either SFM as the active layer or no active layer. We acknowledge the “Fundacioń Domingo Martínez” (Ayuda a la Investigación 2017. Área de Materiales: celdas decombustible) and “Ministerio de Ciencia, Innovación y Universidades” (RTI2018-095088-B-I00 and RTI2018-093735-B-I00) for financial support. Collaboration between the research groups was facilitated by the “Red de Excelencia”program (MINECO, MAT2017-090695-REDT). |
| Databáze: | OpenAIRE |
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