Perkins, James M., Fearn, Sarah, Cook, Stuart N., Srinivasan, Rajagopalan, Rouleau, Chris M., Christen, Hans M., West, Geoff D., Morris, R. J. H. (Richard J. H.), Fraser, Hamish L., Skinner, Stephen J., Kilner, John A. and McComb, David W.. (2010) Anomalous oxidation states in multilayers for fuel cell applications. Advanced Functional Materials, Vol.20 (No.16). pp. 2664-2674. ISSN 1616-301X

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Abstract

Significant recent interest has been directed towards the relationship between interfaces and reports of enhanced ionic conductivity. To gain a greater understanding of the effects of hetero-interfaces on ionic conductivity, advanced analytical techniques including electron microscopy (TEM/STEM), electron energy loss spectroscopy (EELS), and secondary ion mass spectrometry (SIMS) are used to characterize CeO2/Ce0.85Sm0.15O2 multilayer thin films grown by pulsed laser deposition. High quality growth is observed, but ionic conductivity measured by impedance spectroscopy and O-18 tracer experiments is consistent with bulk materials. EELS analysis reveals the unusual situation of layers containing only Ce(IV) adjacent to layers containing both Ce(III) and Ce(IV). Post oxygen annealing induced oxygen diffusion and mixed oxidation states in both layers, but only in the vicinity of low angle grain boundaries perpendicular to the layers. The implications of the anomalous behavior of the Ce oxidation states on the design of novel electrolytes for solid oxide fuel cells is discussed.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry T Technology T Technology > TA Engineering (General). Civil engineering (General) Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Advanced Functional Materials
Publisher:	Wiley - V C H Verlag GmbH & Co. KGaA
ISSN:	1616-301X
Date:	23 August 2010
Volume:	Vol.20
Number:	No.16
Number of Pages:	11
Page Range:	pp. 2664-2674
Identification Number:	10.1002/adfm.201000279
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Royal Society (Great Britain), DOE, Engineering and Physical Sciences Research Council (EPSRC), DTA, Royal Academy of Engineering, AtlantICC alliance partnership, Division of Scientific User Facilities, U.S. Department of Energy
Grant number:	2009-022, EP/C51596X/1 (EPSRC), EP/D068924/1 (EPSRC)
URI:	http://wrap.warwick.ac.uk/id/eprint/5218

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