Abstracts Book - IMRC 2018

• SC1-O011 Invited Talk
SYNTHESIS AND ELECTRICAL PROPERTIES OF CO-DOPED ZrO2
SOLID ELECTROLYTES FOR THEIR USE IN SOFC
José Alonso Díaz Guillén 1 , Carlos Andrés Durón Sifuentes 1 , Madelyne Salazar Zertuche 1 ,
Oswaldo Burciaga Díaz 1 , Sagrario Martínez Montemayor 2 , David Rentería 1 , Antonio F. Fuentes 3
1 Instituto Tecnológico de Saltillo, División de Estudios de Posgrado e Investigación, Mexico.
2 Centro de Investigación en Química Aplicada - CIQA , Departamento de Materiales Avanzados,
Mexico. 3 Centro de Investigación y de Estudios Avanzados del IPN - CINVESTAV Unidad Saltillo,
Ingeniería Cerámica, Mexico.
We show an analysis of electrical properties of solid electrolytes based on Er and
Y co-doped ZrO2, on views to their application in Solid Oxide Fuel Cells (SOFC).
These ceramics were obtained by mechanical milling, by using a planetary mill
and ZrO2 containers and balls. Three compositions with general formula
ErxY0.04Zr0.96-xO2-δ (x = 0.02, 0.05 and 0.1) were obtained starting from mixtures
of the corresponding oxides ZrO2, Y2O3 and Er2O3. Evolution of samples with
milling time was followed by X-ray powder diffraction at different time intervals.
Just milled samples were also uniaxially pressed and sintered at 1500°C during
6 hours to obtain dense pellets, whose morphology was analyzed by Scanning
Electronic Microscopy (SEM). Ionic conductivity and activation energies for
oxygen ion diffusion were determined in sintered pellets by impedance
spectroscopy, as a function of temperature (from 280 to 700°C) and frequency
(100 Hz to 1 MHz). Results show that these materials can be successfully
synthesized after 20 hours of milling and their structural arrangement is related
to the degree of doping, since for x = 0.02 and 0.05, tetragonal phase is obtained,
while stabilization of cubic structure is reached for x = 0.1. Results of electrical
properties reveal that these materials show good electrical properties, similar to
those obtained for ionic conductors, making these complex oxides interesting
candidates to be used as solid electrolytes in Solid Oxide Fuel Cell (SOFC).
Acknowledgment:
This work was financially supported by CONACYT (grants CB-2011-01-166 995
and CB2013-221 701).
Keywords: Solid electrolytes, SOFC, YPSZ
Presenting authors email: jadiaz@itsaltillo.edu.mx