Highly conductive barium zirconate-based carbonate composite electrolytes for intermediate temperature-protonic ceramic fuel cells
Highly conductive barium zirconate-based carbonate composite electrolytes for intermediate temperature-protonic ceramic fuel cells
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DOI：
10.1016/j.jallcom.2013.09.130
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发表时间：
2014-02
影响因子：
6.2
通讯作者：
Ka-Young Park;T. Lee;Ji-tae Kim;N. Lee;Y. Seo;Sun-Ju Song;Jun-Y. Park
中科院分区：
文献类型：
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作者：
Ka-Young Park;T. Lee;Ji-tae Kim;N. Lee;Y. Seo;Sun-Ju Song;Jun-Y. Park
Two-phase composite materials consisting of a BZY matrix phase and a binary eutectic carbonate (Li–0.5Na)2CO3phase are designed in order to promote the densification and ionic conductivity of BaZr0.85Y0.15O3−δ(BZY) proton conductors at intermediate temperature. In the presence of carbonate phase, a considerable change in microstructure for the densification of BZY electrolytes sintered at 670 °C for 4 h is clearly visible in SEM analysis. This sintering effect is due to the formation of molten phase associated with carbonates at low temperature (495 °C) by TG–DTA analysis. The conductivity of composite electrolytes is significantly higher than that of BZY over the entire temperature and atmosphere range studied by AC impedance and DC four-probe methods. In addition, the change of the carbonate content in the composite electrolyte presents a great influence on the conductivity. The composite containing 25 wt.% (Li–0.5Na)2CO3shows the highest ionic conductivity of 0.176 S cm−1at 550 °C and lowest activation energy of 0.127 eV in the temperature range of 500–650 °C.
