Síntesis y caracterización de la doble perovskita BaSrCoFe$_{1 - x}$Ni$_{x}$O$_{5.5}$ como cátodo para celdas SOFC

J. Alvarado-Flores, L. Ávalos-Rodríguez, G. Viramontes-Gamboa, A. Re, es-Rojas.

Abstract


Have been synthesized via sol-gel method and characterized by X-ray diffraction (XRD), electrical conductivity and thermal expansion coefficient (TEC), new material composites BaSrCoFe$_{1 - x}$Ni$_{x}$O$_{5.5}$ (double perovskite type) with the addition of Ni in solid solution Ni$_{x}$ (x = 0.025, 0.05, 0.075, 0.1 and 0.2), as alternative cathodes for solid oxide fuel cells of intermediate temperature (SOFC-IT). XRD confirmed the formation of the tetragonal structure perovskite phase BaSrCoFe$_{1 - x}$Ni$_{x}$O$_{5.5}$, with the presence of small peaks identified in 2$\theta $ values below 30$^{\circ}$ as BaCO$_{3}$ and CoFe$_{2}$O$_{4}$. The electrical conductivity increases with temperature between 350-470$^{\circ}$C and then decreases due to the loss of oxygen in the net, which causes differences in conductivity. Semiconductor behavior was obtained in all compositions. TEC determination, showed a linear dependence inversely proportional to the concentration of Ni. Our results of electrical conductivity and TEC, lead us to the conclusion that the cathodes between 0.1 and 0.2 Ni, have the greatest possibility for application in IT-SOFC.

Keywords


Composite material; sol-gel; electrical conductivity; solid oxide fuel cells (SOFC)

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REVISTA MEXICANA DE FÍSICA, year 67, issue 1, January-February 2021. Bimonthly Journal published by Sociedad Mexicana de Física, A. C. Departamento de Física, 2º Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Apartado Postal 70-348. Tel. (+52)55-5622-4946, https://rmf.smf.mx/ojs/rmf, e-mail: rmf@ciencias.unam.mx. Chief Editor: José Alejandro Ayala Mercado. INDAUTOR Certificate of Reserve: 04-2019-080216404400-203, ISSN: 2683-2224 (on line), 0035-001X (print), both granted by Instituto Nacional del Derecho de Autor. Responsible for the last update of this issue, Technical Staff of Sociedad Mexicana de Física, A. C., Fís. Efraín Garrido Román, 2º. Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Date of last modification, January 4, 2021.

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