Seal Glass for Solid Oxide Fuel Cells

M. Suklueng
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Abstract

Barium calcium aluminum boro-silicate glass (BCABS) is used as a sealant for Solid Oxide Fuel Cells (SOFCs) to protect against air and hydrogen gas leaking at 800 (cid:1) C. One major problem is the chemical reaction of this glass with barium oxide and other materials in the composition such as Ba-Y-Co-Fe (BYCF) and Ba-Sr-Co-Fe (cathode) used in the fuel cell components, leading to the formation and spreading of barium aluminosilicate glass on the cathode surface in the fuel cell. This investigation indicated that adding 0.4 mol% ZrO 2 to BCABS prevents the formation of barium aluminosilicate glass. Generally, the sealing glass of fuel cells must show high resistivity for no disturbance to electricity from the fuel cell system when generating the electron. The 0.4 mol% ZrO 2 to BCABS is generated with resistivity of 4 M Ω that is useful for SOFCs technology. The thermal expansion coefficient (TEC) in SOFCs is the major condition for producing the cell layers. The thermal expan- sion coefficient of SOFCs based on each layer (cathode, electrolyte, anode, interconnect and sealant) should be closed to prevent broken cells. The thermal expansion coefficient is 12.40 (cid:3) 10 (cid:4) 6 / o C matched with the TEC of the GDC 10 electrolyte. Therefore, BCABS glass with 0.4 mol%ZrO 2 generated a novel composite for SOFCs.
固体氧化物燃料电池密封玻璃
钡钙铝boro-silicate玻璃(bcab)被用作密封剂固体氧化物燃料电池(sofc)来防止空气和氢气泄漏800 (cid): 1) c的一个主要问题是玻璃的化学反应与氧化钡和其他材料的成分如Ba-Y-Co-Fe (BYCF)和Ba-Sr-Co-Fe(阴极)用于燃料电池组件,导致钡铝硅酸盐玻璃的形成和传播在燃料电池阴极表面。研究表明,在BCABS中加入0.4 mol%的zro2可以防止钡铝硅酸盐玻璃的形成。一般来说,燃料电池的密封玻璃必须具有高电阻率,以便在产生电子时不会对燃料电池系统的电产生干扰。生成的0.4 mol% zro2到BCABS的电阻率为4 M Ω,这对SOFCs技术很有用。sofc的热膨胀系数(TEC)是形成电池层的主要条件。sofc的每一层(阴极、电解液、阳极、互连和密封剂)的热膨胀系数都应该是封闭的,以防止电池破裂。热膨胀系数为12.40 (cid:3) 10 (cid:4) 6 / o C,与gdc10电解质的TEC相匹配。因此,含有0.4 mol% zro2的BCABS玻璃产生了一种新型的sofc复合材料。
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