Journal
JOURNAL OF POWER SOURCES
Volume 185, Issue 2, Pages 1030-1039Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2008.08.056
Keywords
SOFC; Interconnect; Nickel; Silver; Cavitation; Water vapor
Funding
- Departments of Energy
- DOE [DEFC26 02NT41578]
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Nickel. silver. and a nickel-silver composite have been tested in a simulated solid oxide fuel cell interconnect environment. The susceptibility of the interconnect to mechanical degradation as a result of environmental attack has been analyzed. The experimental results of this study demonstrate that silver is unstable in the interconnect environment, while nickel remains stable. A finite difference model has been developed to analyze how the simultaneous diffusion of hydrogen and oxygen into the interconnect can result in the nucleation of water vapor bubbles. In addition, a model developed by Raj and Ashby to describe the growth of cavities under creep conditions has been employed to predict the rate at which cavity growth will occur. Finally, a Ni-Ag composite was fabricated and studied as an interconnect in an attempt to avoid the mechanical degradation that Occurs in silver, while maintaining a path for electrical conduction that is not degraded by oxidation. (c) 2008 Elsevier B.V. All rights reserved.
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