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LSM Protective Coatings on Stainless Steel as Interconnects for Solid Oxide Fuel Cells

Published online by Cambridge University Press:  18 March 2014

Ryan Eriksen
Affiliation:
Material Science Division, Boston University, Brookline, MA 02445, U.S.A.
Srikanth Gopalan
Affiliation:
Material Science Division, Boston University, Brookline, MA 02445, U.S.A.
Sanjay Sampath
Affiliation:
Material Science and Engineering, Stony Brook University, Stony Brook, NY, U.S.A.
Yikai Chen
Affiliation:
Material Science and Engineering, Stony Brook University, Stony Brook, NY, U.S.A.
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Abstract

One of the major barriers to the adoption of solid oxide fuel cells (SOFCs) is the short lifetime of the fuel cell stacks. A stack consists of a number of cells in series separated by an interconnect. Due to the high temperatures necessary for SOFCs, typical commercial interconnects are ceramic. Great attention has been paid to decreasing the operating temperature of SOFCs in order to extend the life and decrease the cost of the stack. As operating temperatures decrease below 1000°C, alternative interconnect materials become viable. Stainless steel interconnects are more cost effective than ceramic interconnects but the high temperatures and the oxidizing environment of the cathode leads to the formation of a chromium oxide scale that increases the stack resistance. Chromium from the stainless steel can also enter the vapor phase and redeposit on the cathode thereby blocking the electrochemically active sites. One method to neutralize these effects is to coat the metallic interconnect in a ceramic such as La.8Sr.2MnO3 (LSM). The coating acts as a diffusion barrier both against chromium diffusing into the cathode and oxygen diffusing into the interconnect. In this study LSM has been deposited using plasma spray and tested in a dual atmosphere setup using impedance spectroscopy to analyze the performance of the coatings at various temperatures. The area specific resistance and chemical composition of the scale was examined in order to determine the affect of the LSM coating.

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Articles
Copyright
Copyright © Materials Research Society 2014 

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References

REFERENCES

Huang, W., Gopalan, S., Pal, U. B., and Basu, S. N., “Evaluation of Electrophoretically Deposited CuMn[sub 1.8]O[sub 4] Spinel Coatings on Crofer 22 APU for Solid Oxide Fuel Cell Interconnects,” J. Electrochem. Soc., vol. 155, no. 11, p. B1161, 2008.CrossRefGoogle Scholar
Vinod, M. J., “Efficiency analysis of planar solid oxide fuel cell,” ECS Trans., vol. 7, no. 1, pp. 19391943, 2007.Google Scholar
Park, S., Vohs, J., and Gorte, R., “Direct oxidation of hydrocarbons in a solid-oxide fuel cell,” Nature, vol. 404, no. 6775, pp. 265–7, Mar. 2000.CrossRefGoogle Scholar
Singhal, S. and Kendall, K., High-temperature Solid Oxide Fuel Cells: Fundamentals, Design and Applications: Fundamentals, Design and Applications, 1st ed. Oxford: Elsevier, 2003.Google Scholar
Steele, B. C. and Heinzel, a, “Materials for fuel-cell technologies.,” Nature, vol. 414, no. 6861, pp. 345–52, Nov. 2001.CrossRefGoogle ScholarPubMed
Williams, M., Strakey, J., Surdoval, W., and Wilson, L., “Solid oxide fuel cell technology development in the U.S.,” Solid State Ionics, vol. 177, no. 19–25, pp. 20392044, Oct. 2006.CrossRefGoogle Scholar
Yang, Z., “Recent advances in metallic interconnects for solid oxide fuel cells,” Int. Mater. Rev., vol. 53, no. 1, pp. 3954, Jan. 2008.CrossRefGoogle Scholar
Tu, H. and Stimming, U., “Advances, aging mechanisms and lifetime in solid-oxide fuel cells,” J. Power Sources, vol. 127, no. 1–2, pp. 284293, Mar. 2004.CrossRefGoogle Scholar
Peck, D., Miller, M., and Hilpert, K., “Vaporization and thermodynamics of La(1-x)Sr(x)CrO(3y-∂) investigated by Knudsen effusion mass spectrometry,” Solid State Ionics, pp. 401412, 2001.CrossRefGoogle Scholar
Hilpert, K. and Dos, D., “Chromium Vapor Species over Solid Oxide Fuel Cell Interconnect Materials and Their Potential for Degradation Processes,” J. Electrochem. Soc., vol. 143, no. 11, pp. 36423647, 1996.CrossRefGoogle Scholar
Peck, D., Miller, M., and Hilpert, K., “Vaporization and thermodynamics of La(1-x)Ca(x)CrO(3y-∂) investigated by Knudsen effusion mass spectrometry,” Solid State Ionics, vol. 143, pp. 391400, 2001.CrossRefGoogle Scholar
Yang, Z., Xia, G., Li, X., and Stevenson, J., “(Mn,Co)3O4 spinel coatings on ferritic stainless steels for SOFC interconnect applications,” Int. J. Hydrogen Energy, vol. 32, no. 16, pp. 36483654, Nov. 2007.CrossRefGoogle Scholar
Larring, Y. and Norby, T., “Spinel and Perovskite Functional Layers Between Plansee Metallic Interconnect ( Cr-5 wt % Fe-1 wt % Y 2 O 3 ) and Ceramic,” J. Electrochem. Soc., vol. 147, no. 9, pp. 32513256, 2000.CrossRefGoogle Scholar
Yang, Z., Xia, G., Simner, S. P., and Stevenson, J. W., “Thermal Growth and Performance of Manganese Cobaltite Spinel Protection Layers on Ferritic Stainless Steel SOFC Interconnects,” J. Electrochem. Soc., vol. 152, no. 9, p. A1896, 2005.CrossRefGoogle Scholar
Qu, W., Jian, L., Hill, J. M., and Ivey, D. G., “Electrical and microstructural characterization of spinel phases as potential coatings for SOFC metallic interconnects,” J. Power Sources, vol. 153, no. 1, pp. 114124, Jan. 2006.CrossRefGoogle Scholar
Mikkelsen, L. and Linderoth, S., “High temperature oxidation of Fe – Cr alloy in O2 – H2 – H2O atmospheres⌨ microstructure and kinetics,” vol. 361, pp. 198212, 2003.CrossRefGoogle Scholar