Abstract
Seal glass plays a crucial role in solid oxide fuel cell performance and durability. In this review paper, overall composition–structure–property relations of seal glasses are discussed from bulk glass behavior, interfacial interaction, and sealing ability point of view. A seal glass should have a combination of desired thermal, chemical, mechanical, and electrical properties in order to seal cell components and stacks and prevent gas leakage. It must be stable for ∼40,000 h at 500–1000 °C in oxidizing and reducing atmospheres and withstand ∼10,000 thermal cycles between room temperature and cell operating temperature. A SrO–La 2O 3–Al 2O 3–SiO 2 based seal glass shows the promise to meet all the desired thermophysical properties, long-term stability, and thermal cycling resistance. In this paper, the most recent advances in the field are discussed along with this glass. Future seal glass research directions for solid oxide fuel cells are also analyzed.
Highlights
Solid oxide fuel cells (SOFCs) are a type of power source conversion device which can transform hydrogen or hydrocarbon gas in fuel into electricity at an intermediate temperature of 600–800C
The Barium calcium aluminum boro-silicate glass (BCABS) sealing glass is mixed with the cathode side of Solid Oxide Fuel Cells (SOFCs) at high temperatures
The cathode is conducted by BCABS sealing glass that can clearly reduce the power density in SOFCs
Summary
Solid oxide fuel cells (SOFCs) are a type of power source conversion device which can transform hydrogen or hydrocarbon gas in fuel into electricity at an intermediate temperature of 600–800C. The development of glass ceramic sealants containing the addition of 0.4 mol%ZrO2 in the BCABS glass composition can be shown to use low cost advanced materials for SOFC technology. This sealing glass can prevent the spread of barium aluminosilicate on the surface of the barium composition on the cathode side of the SOFC system. The microstructure between cathode and glass is free of cracks and shows good adherence to both surfaces These properties of BCABS-0.4 ZrO2 composition can be promoted as a sealant for SOFC low cost technology which has barium oxide content.
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