Oxygen Reduction Mechanisms in Nanostructured La0.8Sr0.2MnO3 Cathodes for Solid Oxide Fuel Cells
Sacanell, Joaquín (Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina))
Hernández Sánchez, Joaquín (Comisión Nacional de Energía Atómica)
Rubio López, Adrián Ezequiel (Comisión Nacional de Energía Atómica)
Martinelli, Hernán (Comisión Nacional de Energía Atómica)
Siepe, Jimena (Comisión Nacional de Energía Atómica)
Leyva, Ana Gabriela (Universidad Nacional de General San Martín)
Ferrari, Valeria Paola (Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina))
Juan, Dilson (Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina))
Pruneda, Miguel (Institut Català de Nanociència i Nanotecnologia)
Mejía Gómez, Augusto (Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina))
Lamas, Diego Germán (Universidad Nacional de General San Martín)

Date:	2017
Abstract:	In this work we outline the mechanisms contributing to the oxygen reduction reaction in nanostructured cathodes of LaSrMnO (LSM) for Solid Oxide Fuel Cells (SOFC). These cathodes, developed from LSM nanostructured tubes, can be used at lower temperatures compared to microstructured ones, and this is a crucial fact to avoid the degradation of the fuel cell components. This reduction of the operating temperatures stems mainly from two factors: (i) the appearance of significant oxide ion diffusion through the cathode material in which the nanostructure plays a key role and (ii) an optimized gas phase diffusion of oxygen through the porous structure of the cathode, which becomes negligible. A detailed analysis of our Electrochemical Impedance Spectroscopy supported by first-principles calculations point toward an improved overall cathodic performance driven by a fast transport of oxide ions through the cathode surface.
Grants:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-301 Ministerio de Economía y Competitividad FIS2015-64886-C5-3-P Ministerio de Economía y Competitividad SEV-2013-0295
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Subject:	Cath-ode materials ; First-principles calculation ; Fuel cell components ; Gas phase diffusion ; Lower temperatures ; Operating temperature ; Oxide-ion diffusion ; Oxygen reduction reaction
Published in:	Journal of physical chemistry. C, Vol. 121, Issue 12 (March 2017) , p. 6533-6539, ISSN 1932-7455

DOI: 10.1021/acs.jpcc.7b00627

Preprint 21 p, 583.2 KB

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