A novel alkaline-earth silicate (Sr-Ca-Y-B-Si-Zn) sealing glass was developed for solid oxide fuel cell (SOFC) applications. The glass was sandwiched between two metallic interconnect plates and tested for electrical stability in dual environmnet at elevated temperatures of 800-850 degrees C. A ferritic stainless steel (Crofer22APU) was used as the metallic interconnect material in the as-received state and coated with (Mn,Co)3O4 spinel. The isothermal aging results showed stable electrical resistivity at 800-850 degrees C for ~500-1000 hr. The electrical resistivities at 800 or 850 degrees C of the spinel-coated samples were lower than the as-received ones; however, they were still several orders of magnitude higher than typical SOFC functional parts. Interfacial microstructure was characterized and possible reactions are discussed.
Revised: June 30, 2010 |
Published: September 1, 2010
Citation
Chou Y.S., J.W. Stevenson, G. Xia, and Z. Yang. 2010.Electrical stability of a novel sealing glass with (Mn,Co)-spinel coated Crofer22APU in a simulated SOFC dual environment.Journal of Power Sources 195, no. 17 SP ISS:5666-5673.PNNL-SA-71996.