Influence of the synthesis conditions on the crystal structure and properties of GdBaCo2−xFexO5+δ oxides as air-electrodes for intermediate temperature solid oxide fuel cells. Issue 24 (5th June 2017)

• Record Type: Journal Article
• Authors: Muñoz-Gil, Daniel; Pérez-Coll, Domingo; Urones-Garrote, Esteban; Amador, Ulises; García-Martín, Susana
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 24(2017)
• Page Start: 12550
• Page End: 12556
• Publication Date: 2017-06-05
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7ta02671d
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : GdBaCo2− x Fe x O5+ δ oxides show crystal structures and ASR values dependent on the composition and synthesis atmosphere. A new modulation of the structure is found for the material with x = 0.6. Abstract : The influence of the synthesis conditions on the crystal structure and properties of the oxides of the system GdBaCo2− x Fe x O5+ δ is reported in this article. The materials are prepared by a ceramic method either in air or in an argon atmosphere. Crystal structure characterization is carried out by a combination of powder X-ray diffraction (PXRD) with advanced methods of high resolution transmission electron microscopy (HRTEM), scanning-transmission electron microscopy (STEM) and electron energy-loss spectroscopy (EELS). Thermal expansion coefficients of the oxides decrease with increasing substitution of Co by Fe. Impedance spectroscopy analysis of symmetrical cells using these materials as electrodes reveals area-specific polarization resistance (ASR) values low enough for the use of the oxides as air electrodes in intermediate temperature solid oxide fuel cells (IT-SOFCs).