Preparation and characterization of Ca-Sm-Ce mixed oxides via cellulose templating method for solid oxide fuel cell applications

Ozdemir H., Sariboga V., Oksuzomer M. A. F., Gurkaynak M. A.

JOURNAL OF POWER SOURCES, vol.219, pp.155-162, 2012 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 219
  • Publication Date: 2012
  • Doi Number: 10.1016/j.jpowsour.2012.07.033
  • Journal Name: JOURNAL OF POWER SOURCES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.155-162
  • Istanbul University Affiliated: Yes

Abstract

 

SmxCa0.2  xCe0.8Oy materials are synthesized by changing mol ratios of the composition as x ¼ 0, 0.05, 0.1,
0.15 and 0.2, respectively, with a fast and facile cellulose templating method for the ? rst time. Micro-
structures  of  the  calcined  and  sintered  samples  are  characterized  by  XRD  and  SEM-EDX.  Density
measurements are actualized by using Archimedes method. The electrical conductivity of the samples is
obtained from two-probe impedance spectroscopy. Maximum solubility limit of CaO in CeO2 is found to
be 9.4 mol% from the XRD results. Incorporation of CaO slightly increases the sinterability of the samples.
It is observed that Smþ 3  expands the CeO2  lattice more than Caþ 2. 10 mol% CaO incorporated sample
show the highest total conductivity with the value of 0.032 S cm 1 at 800 C. Obtained results show that
Sm0.1Ca0.1Ce0.8Oy  can  be  an  excellent  candidate  for  intermediate  temperature  solid  oxide  fuel  cell
applications due to its lower cost and higher performance compared to Sm0.2Ce0.8Oy at 800 C. Addi-
tionally, cellulose templating method can be used as an effective method in order to prepare mixed oxide
structures since the performances of the samples are higher than the samples which are prepared by
more complex or costly hydrothermal and co-precipitation methods in literature.