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Title: Synthesis and characterization of Gd3+ and Sm3+ ion doped ceria electrolytes through an in-situ sulphated combustion technique
Authors: Mangalaraja, R V
Ananthakumar, S
Uma, K
Jiménez, R M
Uthayakumar, S
Lopez, M
Camurri, C P
Keywords: Combustion
Sulphate ion
Nano ceria
Fuel cell
Issue Date: 2012
Publisher: Hanyang University Press
Citation: Journal of Ceramic Processing Research 13(1):15-22;2012
Abstract: An in-situ sulphated-combustion synthesis is reported to obtain gadolinium [Ce0.9Gd0.1O1.95] and samarium [Ce0.9Sm0.1O1.95] doped ceria electrolytes for solid oxide fuel cells (SOFCs). Nitrate precursors of cerium, gadolinium and samarium reactants were mixed homogenously with a citric acid fuel with an in-situ addition of 10 and 20 mol% ammonium sulphate [(NH4)(2)SO4]. The mixture was combusted at 500 degrees C and subsequently calcined at 700 degrees C. The influence of the sulphate addition on the morphology of ceria particles has been analyzed. It is seen that the in-situ SO42- ions highly favors the nucleation and growth of doped ceria electrolytes on a nanometer scale with an added advantage of improved crystallinity. TEM analysis indicates loosely agglomerated and nearly spherically shaped ceria nano particles with a maximum particle size of 20 nm
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