Development of Al2O3/glass-based multi-layer composite seals for planar intermediate-temperature solid oxide fuel cells

In this paper, the novel multi-layer composite seals for planar solid oxide fuel cells are studied. The composite seals with sandwiched structure include Al2O3-based tape as support and glass-ceramic slurry as binder connecting the interface of the neighboring components. The result finds out that g...

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Bibliographic Details
Published in:	International journal of hydrogen energy 2013-11, Vol.38 (35), p.15371-15378
Main Authors:	Zhang, Weihao, Yan, Dong, Duan, Jianbin, Pu, Jian, Chi, Bo, Li, Jian
Format:	Article
Language:	eng
Subjects:	Alternative fuels. Production and utilization Aluminum oxide Applied sciences Compatibility Current density Energy Exact sciences and technology Fuels Glass ceramics Hydrogen Leakage Leakage rates Multi-layer composite seals Multilayers Seals Slurries Solid oxide fuel cell Solid oxide fuel cells Thermal cycle stability
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Summary:	In this paper, the novel multi-layer composite seals for planar solid oxide fuel cells are studied. The composite seals with sandwiched structure include Al2O3-based tape as support and glass-ceramic slurry as binder connecting the interface of the neighboring components. The result finds out that glass-ceramic slurry with 20 wt% Al2O3 has the suitable strength and deformability. The thermal cycle characteristics are greatly improved by using the multi-layer composite seals, and the corresponding leakage rates are lower than 0.025 sccm cm−1 for 20 thermal cycles at the inlet pressure ranging from 0.5 psi to 2 psi. SEM investigations show a very compact and good adhesion between the neighboring components, which can minimize the leakage paths. Single cell testing is used to examine the performance of the seals. The value of open circuit voltage is 1.17 V. At the constant discharge current density of 0.37 A cm−2, the voltage is stabilized at about 0.85 V for 50 h. The results demonstrate that the novel multi-layer composite seals are good candidate for SOFC application. •A novel Al2O3/glass-based multi-layer composite seals was studied.•Leakage rates of the seals are lower than 0.025 sccm cm−1 within 20 thermal cycles.•Glass-based seals with 20 wt% Al2O3 show optimized strength and deformability.•The cell with composite seals show undetectable performance degradation for 50 h.
ISSN:	0360-3199 1879-3487