期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 37, 期 13, 页码 3981-3993出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.05.018
关键词
Co-sintering; YSZ/GDC bilayer; Interface; Interdiffusion; Solid oxide electrolysis cell
资金
- Engineering and Physical Sciences Research Council (EPSRC) [EP/K001329/1]
- EPSRC [EP/K001329/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/K001329/1] Funding Source: researchfish
Bilayer electrolytes have potential in solid oxide cells to improve ionic conduction whilst blocking electronic conduction. GDC/YSZ bilayer electrolyte processing has proven problematic due to thermochemical instability at high sintering temperatures. We first match the shrinkage profile of the two bulk materials using a Fe2O3 sintering additive. Additions of 5 mol% of Fe2O3 in the GDC layer and 2 mol% of Fe2O3 in the YSZ layer prevents delamination during co-sintering. The addition of Fe2O3 promotes densification, enabling achievement of a dense bilayer at a reduced sintering temperature of 1300 degrees C; 150 degrees C below conventional sintering temperatures. Elemental analysis showed the compositional distribution curves across the bilayer interface to be asymmetric when Fe2O3 is employed. The Fe2O3 increases the total conductivity of the bilayer electrolyte by an order of magnitude; this is explained by the effect of Fe2O3 on reducing the resistive solid solution interlayer at YSZ/GDC interface from similar to 15 to similar to 5 mu m. (C) 2017 The Authors. Published by Elsevier Ltd.
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