A Novel SOFC/SOEC Sealing Glass with a Low SiO2 Content and a High Thermal Expansion Coefficient. (30th May 2017)

• Record Type: Journal Article
• Authors: Kiebach, Ragnar; Agersted, Karsten; Zielke, Philipp; Ritucci, Ilaria; Brock, Mette Bybjerg; Hendriksen, Peter Vang
• Is Part Of: ECS transactions. Volume 78:Number 1(2017)
• Page Start: 1739
• Page End: 1747
• Publication Date: 2017-05-30
• Subjects: Electrochemistry -- Periodicals; Electrochemistry; Periodicals; Electronic journals; Electronic journal; 541.37
• DOI: 10.1149/07801.1739ecst
• Languages: English
• ISSNs: 1938-5862

Abstract

Abstract : Solid oxide cells require seals that can function in harsh, elevated temperature environments. In addition, a low Si content can be advantageous, since Si impurities from the glass sealant can be transported to the active fuel electrode and poison the Ni-YSZ triple phase boundaries. To reduce the amount of Si emission, a low Si containing sealing glass (chemical composition: 50 mol% CaO, 20 mol% ZnO, 20 mol% B2 O3 and 10 mol% SiO2 ) was developed at DTU. In this work, the results from thermal characterization, the crystallization behavior of the glass and the long-term stability and adhesion behavior of the glass were studied under SOFC and SOEC relevant conditions. The glass-ceramic sealant performed well over 400 h, and no cell degradation or leakage related to the seal was found, indicating that the developed glass system is applicable for the use in SOFC/SOEC stacks.