Synthesis and characterization of B-site doped La0.20Sr0.25Ca0.45TiO3 as SOFC anode materials
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In this paper, B-site doping of an optimized A-site deficient composition, calcium-doped lanthanum strontium titanate, La0.2Sr0.25Ca0.45TiO3 (LSCTA−) with Ni and Fe is presented. The doped compositions were successfully synthesized by the Pechini method and then characterized by XRD, SEM, dilatometry, ac impedance, and dc conductivity. The doped analogues preserved the orthorhombic symmetry of the parent, LSCTA−. The observed dilatometric results were correlated with the particle size. Ac impedance studies revealed their semi-conducting behaviour in air. Furthermore, the doped compositions showed higher conductivity values in reducing atmosphere. Compared to bare pre reduced LSCTA− having conductivity of 38 S cm−1, the pre reduced 5% Ni doped LSCTA− (LSCTN5) and 5% Fe doped LSCTA− (LSCTF5) showed conductivity values of 47 S cm−1 and 66 S cm−1 at 880 °C, respectively. B-site doping could affect the electrical and catalytic properties of LSCTA− materials making them viable alternatives for fuel cell applications.
Yaqub , A , Janjua , N , Savaniu , C D & Irvine , J T S 2015 , ' Synthesis and characterization of B-site doped La 0.20 Sr 0.25 Ca 0.45 TiO 3 as SOFC anode materials ' International Journal of Hydrogen Energy , vol 40 , no. 1 , pp. 760-766 . DOI: 10.1016/j.ijhydene.2014.08.083
International Journal of Hydrogen Energy
Copyright © 2014 Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved. NOTICE: this is the author’s version of a work that was accepted for publication in International Journal of Hydrogen Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Hydrogen Energy, 40(1), 2014, http://dx.doi.org/10.1016/j.ijhydene.2014.08.083
DescriptionResearch made possible by the Engineering and Physical Sciences Research Council Platform Grant (EPSRC Platform Grant number EP/K006800/1).
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