Physical and sealing properties of BaO-Al_2O_3-SiO_2-CaO-V_2O_5 glasses for solid oxide fuel cell applications

摘要

In this study, the properties of BaO-Al2O3-SiO2 (SAB) glasses incorporated with CaO and V2O5 as the network modifier and additive, respectively, are evaluated. The electrical resistivities of the glasses decrease upon the addition of CaO but increase upon increasing their V2O5 content because the V5+ species lower the ionic mobility of the glasses. The addition of V2O5 improves the wettability of the glasses on the Crofer 22 APU substrate, and thus, increases the fracture strength at the glass-Crofer 22 APU couple. Among the glasses evaluated, the SAB glass with a CaO content of 20 wt and V2O5 content of 2 wt (SABCa20V2) present excellent sealing properties because it adheres well to both the Zr-0.92-Y0.08O2-delta (YSZ) and Crofer 22 APU substrates; no pores, cracks, or interfacial phases are present at the interfaces, confirming the good chemical and thermal compatibility of the glass-substrate pairs at high temperatures. After SAB-Ca20V2 is sealed on the Crofer 22 APU substrate at 850 degrees C, the leakage rate of the glass is low (0.015 sccm,cm1 at 800 degrees C for 200 h), indicating negligible deterioration of its sealing efficiency and revealing its remarkable potential for use in solid oxide fuel cell applications. (C) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.