An in operando study of chemical expansion and oxygen surface exchange rates in epitaxial GdBaCo2O5.5 electrodes in a solid-state electrochemical cell by time-resolved X-ray diffraction
Chatterjee, Arindom (Institut Català de Nanociència i Nanotecnologia)
Caicedo Roque, Jose Manuel (Institut Català de Nanociència i Nanotecnologia)
Ballesteros, Belén (Institut Català de Nanociència i Nanotecnologia)
Santiso, José (Institut Català de Nanociència i Nanotecnologia)

Date:	2018
Abstract:	This report explores the fundamental characteristics of epitaxial thin films of a mixed ionic electronic conducting GdBaCoO (GBCO) material with a layered perovskite structure, relevant for use as an active electrode for the oxygen reduction and evolution reactions in electrochemical devices. Time-resolved X-ray diffraction in combination with voltage step chrono-amperometric measurements in a solid state electrochemical cell provides a deeper insight into the chemical expansion mechanism in the GBCO electrode. The chemical expansion coefficient along the c-axis, α, shows a negative value upon the compound oxidation contrary to standard perovskite materials with disordered oxygen vacancies. Chemical expansion also shows a remarkable asymmetry from α = -0. 037 to -0. 014 at δ < 0 and δ.
Grants:	Ministerio de Economía y Competitividad MAT2016-77100-C2-1-P European Commission 645658 Ministerio de Economía y Competitividad SEV-2013-0295
Rights:	Aquest material està protegit per drets d'autor i/o drets afins. Podeu utilitzar aquest material en funció del que permet la legislació de drets d'autor i drets afins d'aplicació al vostre cas. Per a d'altres usos heu d'obtenir permís del(s) titular(s) de drets.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Amperometric measurements ; Electrochemical devices ; Fundamental characteristics ; Layered perovskite structure ; Oxygen non-stoichiometries ; Oxygen reduction and evolution reactions ; Solid-state electrochemical cells ; Time resolved x-ray diffractions
Published in:	Journal of materials chemistry. A, Vol. 6, Issue 26 (July 2018) , p. 12430-12439, ISSN 2050-7496

DOI: 10.1039/c8ta02790k

Postprint 30 p, 1.4 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles