Silica is a well-known impurity in solid oxide fuel cell raw materials, namely NiO and yttria-stabilized zirconia (YSZ). At elevated temperatures silica will migrate to the grain boundaries, form insulating siliceous phases, and lead to a decrease in the ionic conductivity of the electrolyte. Furthermore, silica impurities have been shown to damage the anode/electrolyte interface, such that an overall decrease in cell performance and long-term stability is observed. Despite the fact that silica is ubiquitous in commercial-grade raw materials and can be incorporated from several extrinsic sources, it has negative effects on the solid oxide fuel cell, such that any further contamination should be avoided to prevent performance degradation and eventual cell failure. This paper reviews and outlines the sources and effects of silica on the solid oxide fuel cell, and attempts to determine a guideline for acceptable levels of silica contamination.
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October 2011
This article was originally published in
Journal of Fuel Cell Science and Technology
Technology Review
A Review of the Implications of Silica in Solid Oxide Fuel Cells
Michael Lankin
,
Michael Lankin
Ceres Power, Viking House, Foundry Lane, Horsham, West Sussex, RH13 5PX,
United Kingdom
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Yanhai Du
,
duya@engr.sc.edu
Yanhai Du
University of South Carolina
, 541 Main Street, Columbia, SC
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Caine Finnerty
Caine Finnerty
WATT Fuel Cell Corp.
caine.finnerty@wattfuelcell.com
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Michael Lankin
Ceres Power, Viking House, Foundry Lane, Horsham, West Sussex, RH13 5PX,
United Kingdom
Yanhai Du
Caine Finnerty
J. Fuel Cell Sci. Technol. Oct 2011, 8(5): 054001 (7 pages)
Published Online: June 17, 2011
Article history
Received:
May 27, 2010
Revised:
November 10, 2010
Online:
June 17, 2011
Published:
June 17, 2011
Citation
Lankin, M., Du, Y., and Finnerty, C. (June 17, 2011). "A Review of the Implications of Silica in Solid Oxide Fuel Cells ." ASME. J. Fuel Cell Sci. Technol. October 2011; 8(5): 054001. https://doi.org/10.1115/1.4003980
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