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Artículo

Revisiting the Crystal Structure of BaCe0.4Zr0.4Y0.2O3-δ Proton Conducting Perovskite and Its Correlation with Transport Properties

Basbus, Juan FelipeIcon ; Arce, Mauricio DamiánIcon ; Napolitano, Federico RicardoIcon ; Troiani, Horacio EstebanIcon ; Alonso, José Antonio; Saleta, Martin EduardoIcon ; González, Miguel A.; Cuello, Gabriel JulioIcon ; Fernández Díaz, María Teresa; Pardo Sainz, Miguel; Bonanos, Nikolaos; Jimenez, Catalina Elena; Giebeler, Lars; Figueroa, Santiago J. A.; Caneiro, AlbertoIcon ; Serquis, Adriana CristinaIcon ; Mogni, Liliana VerónicaIcon
Fecha de publicación: 02/2020
Editorial: American Chemical Society
Revista: ACS Applied Energy Materials
ISSN: 2574-0962
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Física de los Materiales Condensados

Resumen

Oxides with proton conductivity have a great potential for applications in environmental energy technology. Despite the BaCe0.4Zr0.4Y0.2O3-δ (BCZY) perovskites being well-known proton conductors, it is a challenge to determine the optimal operating temperature range where the energy applications benefit most from this unique property. The protonic transport properties strongly depend on crystal structure and local distortions in the participating cation coordination sphere, according to related temperatures and gas feed. The transport and crystallographic properties of BCZY were simultaneously studied by impedance spectroscopy (IS) and synchrotron X-ray diffraction (S-XRD). A strong correlation between conductivity and the lattice parameter, corresponding in principle to a cubic symmetry, was observed, mainly between 400 and 700 °C. The protonic conductivity range was analyzed by the H/D isotopic effect on the impedance spectra, which helped to identify protonic conduction as the governing transport mechanism below 600 °C, while the transport via oxygen vacancies dominates above this temperature. In order to assess the real crystallographic structure, the simultaneous refinement of laboratory XRD and neutron diffraction (ND) patterns was performed. According to this, BCZY changes from rhombohedral symmetry below 400 °C to cubic at 600 °C in a second-order phase transition. Complementary quasielastic neutron scattering (QENS) enables us to determine a protonic jump length of 3.1 Å, which matches the O-O distances in the octahedral oxygen coordination sphere around the cations. These results support the protonic self-diffusion through proton hopping between intraoctahedral O sites as the main transport mechanism up to 600 °C.
Palabras clave: BACE0.4ZR0.4Y0.2O3-Δ (BCZY) PROTONIC CONDUCTOR , CRYSTALLOGRAPHIC PROPERTIES , ISOTOPIC EFFECT , NEUTRON TECHNIQUES , PROTONIC SELF-DIFFUSION , TRANSPORT NATURE MECHANISM
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/146778
URL: https://pubs.acs.org/doi/10.1021/acsaem.9b02498
DOI: http://dx.doi.org/10.1021/acsaem.9b02498
Colecciones
Articulos (UE-INN - NODO BARILOCHE)
Articulos de UNIDAD EJECUTORA INSTITUTO DE NANOCIENCIA Y NANOTECNOLOGIA - NODO BARILOCHE
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Citación
Basbus, Juan Felipe; Arce, Mauricio Damián; Napolitano, Federico Ricardo; Troiani, Horacio Esteban; Alonso, José Antonio; et al.; Revisiting the Crystal Structure of BaCe0.4Zr0.4Y0.2O3-δ Proton Conducting Perovskite and Its Correlation with Transport Properties; American Chemical Society; ACS Applied Energy Materials; 3; 3; 2-2020; 2881-2892
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