Electrical stability of a novel sealing glass with (Mn,Co)-spinel coated Crofer22APU in a simulated SOFC dual environment

• Published in: Journal of power sources 2010-09, Vol.195 (17), p.5666-5673
• Main Authors: Chou, Y.-S., Stevenson, J.W., Xia, G.-G., Yang, Z.-G.
• Format: Article
• Language: English
• Subjects: Applied sciences; Crofer22APU; Direct energy conversion and energy accumulation; Electrical engineering. Electrical power engineering; Electrical power engineering; Electrical resistivity; Electrical stability; Electrochemical conversion: primary and secondary batteries, fuel cells; Energy; Energy. Thermal use of fuels; Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc; Exact sciences and technology; Fuel cells; Glass; Interface; Sealing; Sealing glass; Silicates; Simulation; SOFC; Solid oxide fuel cells; Spinel; Stability
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2010.03.052

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 a dual environment at elevated temperatures of 800–850 °C. A ferritic stainless steel (Crofer22APU) was used as the metallic interconnect material in the as-received state and coated with (Mn,Co) 3O 4 spinel. The isothermal aging results showed stable electrical resistivity at 800–850 °C for ∼500–1000 h. The electrical resistivities at 800 or 850 °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.