Infiltration of ionic-, electronic- and mixed-conducting nano particles into La0.75Sr0.25MnO3–Y0.16Zr0.84O2 cathodes – A comparative study of performance enhancement and stability at different temperatures
Infiltration of ionic-, electronic- and mixed-conducting nano particles into La0.75Sr0.25MnO3–Y0.16Zr0.84O2 cathodes – A comparative study of performance enhancement and stability at different temperatures
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DOI：
10.1016/j.jpowsour.2012.11.070
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发表时间：
2013-04
影响因子：
9.2
通讯作者：
R. Kiebach;C. Knöfel;F. Bozza;T. Klemensø;C. Chatzichristodoulou
中科院分区：
文献类型：
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作者：
R. Kiebach;C. Knöfel;F. Bozza;T. Klemensø;C. Chatzichristodoulou
以La0.8Sr0.2MnO3−δ(LSM)为电子导体，LaCo0.6Ni0.4O3−δ(LCN)为混合导体，Ce0.8Gd0.2O2−δ(CGO)为离子导体，在550 ~ 800℃范围内对LSM - ysz复合电极的微观结构和电化学性能进行了比较。这三种渗透都改善了电化学性能。阻抗分析表明，在所有情况下，解离吸附和物种向三相边界转移是性能增强的主要机制，这是由于入渗后表面积和三相边界的增加。在550°C时，LCN的性能得到了最显著的改善，但随着温度的升高，其性能急剧下降。LSM和CGO渗透电极在加热到800°C时降解较少。浸渍CGO电极在750°C的长期测试中显示出最小的降解率。
The microstructure and electrochemical performance of LSM–YSZ composite electrodes infiltrated with La0.8Sr0.2MnO3−δ(LSM) as an electronic conductor, LaCo0.6Ni0.4O3−δ(LCN) as a mixed conductor and Ce0.8Gd0.2O2−δ(CGO) as an ionic conductor, were compared in the temperature range 550–800 °C. All three infiltrates resulted in improved electrochemical performance. Impedance analysis suggested dissociative adsorption and transfer of species to the triple phase boundary as the main mechanism responsible for the performance enhancement in all cases, attributed to the increase in surface area and triple phase boundary upon infiltration. LCN showed the most pronounced improvement at 550 °C, but its performance degraded drastically with increasing temperature. LSM and CGO infiltrated electrodes degraded less upon heating up to 800 °C. Infiltrated CGO electrodes showed the smallest degradation rate upon long term testing at 750 °C.