Transformation of proton-conducting Perovskite-type into fluorite-type fast oxide ion electrolytes using a CO2 capture technique and their electrical properties

Inorganic Chemistry
Francesca Trobec, Venkataraman Thangadurai

Abstract

Fast oxide ion conducting Ce 1- x M x O 2-delta (M = In, Sm; x = 0.1, 0.2) and Ce 0.8Sm 0.05Ca 0.15O 1.825 were prepared from the corresponding perovskite-like structured materials with nominal chemical composition of BaCe 1- x M x O 3-delta and BaCe 0.8Sm 0.05Ca 0.15O 2.825, respectively, by reacting with CO 2 at 800 degrees C for 12 h. Powder X-ray diffraction (PXRD) analysis showed the formation of fluorite-type CeO 2 and BaCO 3 just after reaction with CO 2. The amount of CO 2 gained per ceramic gram was found to be consistent with the Ba content. The CO 2 reacted samples were washed with dilute HCl and water, and the resultant solid product was characterized structurally and electrically employing various solid-state characterization methods, including PXRD, and alternating current (ac) impedance spectroscopy. The lattice constant of presently prepared Ce 1- x M x O 2-delta and Ce 0.8Sm 0.05Ca 0. 15O 1.825 by a CO 2 capture technique follows the expected ionic radii trend. For example, In-doped Ce 0.9In 0.1O 1.95 (In (3+) (VIII) = 0.92 A) sample showed a fluorite-type cell constant of 5.398(1) A, which is lower than the parent CeO 2 (5.411 A, Ce (4+) (VIII) = 0.97 A). Our attempt to prepare single-phase In-doped CeO 2 samp...Continue Reading

References

Nov 20, 2001·Nature·B C Steele, A Heinzel
Feb 25, 2003·Chemical Society Reviews·R Mark Ormerod
Jan 27, 2005·Chemical Reviews·Stuart B Adler
Apr 2, 2005·Science·Zhongliang Zhan, Scott A Barnett

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Citations

Jun 23, 2011·Inorganic Chemistry·Surinderjit Singh BhellaVenkataraman Thangadurai
Oct 28, 2009·Dalton Transactions : an International Journal of Inorganic Chemistry·Surinderjit Singh BhellaVenkataraman Thangadurai
May 15, 2009·Inorganic Chemistry·Lisa M KutiVenkataraman Thangadurai

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