Thermally and electrochemically induced electrode/electrolyte interfaces in solid oxide fuel cells: An AFM and EIS Study
Thermally and electrochemically induced electrode/electrolyte interfaces in solid oxide fuel cells: An AFM and EIS Study
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DOI：
10.1149/2.0111510jes
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发表时间：
2015
影响因子：
3.9
通讯作者：
S. Jiang
中科院分区：
文献类型：
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作者：
S. Jiang
在高温固体氧化物燃料电池（SOFC）中，电极/电解质界面对电池的电催化活性和耐久性起着关键作用。采用原子力显微镜（AFM）和电化学阻抗谱（EIS）研究了预烧结和原位组装的（La0.8Sr0.2）0.90MnO3（LSM）和La0.6Sr0.4Co0.2Fe0.8O3-δ（LSCF）电极在Y2 O3-ZrO 2（YSZ）和Gd0.2Ce0.8O2（GDC）电解质上的热诱导和电化学诱导电极/电解质界面。结果表明，热致界面的特征是深度为100-400 nm的凸接触环，其直径与预烧结LSM和LSCF电极的颗粒尺寸一致;而在阴极极化条件下，原位组装电极上的电致界面的特征是颗粒状的接触痕迹或团簇（直径为50-100 nm）。接触簇的数量和分布取决于阴极电流密度以及电极和电解质材料。在原位组装的LSCF/GDC界面上的接触簇基本上小于在原位组装的LSM/GDC界面上的接触簇，这可能是由于LSCF材料的高混合离子和电子电导率。结果表明，电化学诱导界面最有可能是由于氧物种的掺入和阳离子在阴极极化条件下的相互扩散。然而，电化学诱导的电极/电解质界面的电催化活性与SOFC操作条件下的O2还原反应的热诱导界面相当。作者（S）2015由ECS发布。这是一篇开放获取的文章，根据知识共享署名4.0许可证（CC BY，http：//creativecommons.org/licenses/by/4.0/）的条款分发，该许可证允许在任何情况下无限制地重复使用作品。
In high temperature solid oxide fuel cells (SOFCs), electrode/electrolyte interfaces play a critical role in the electrocatalytic activity and durability of the cells. In this study, thermally and electrochemically induced electrode/electrolyte interfaces were investigated on pre-sintered and in situ assembled (La0.8Sr0.2)0.90MnO3 (LSM) and La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) electrodes on Y2O3-ZrO2 (YSZ) and Gd0.2Ce0.8O2 (GDC) electrolytes, using atomic force microscopy (AFM) and electrochemical impedance spectroscopy (EIS). The results indicate that thermally induced interface is characterized by convex contact rings with depth of 100–400 nm and diameter in agreement with the particle size of pre-sintered LSM and LSCF electrodes, while the electrochemically induced interfaces under cathodic polarization conditions on in situ assembled electrodes are characterized by particle-shaped contact marks or clusters (50–100 nm in diameter). The number and distribution of contact clusters depend on the cathodic current density as well as the electrode and electrolyte materials. The contact clusters on the in situ assembled LSCF/GDC interface are substantially smaller than that on the in situ assembled LSM/GDC interface likely due to the high mixed ionic and electronic conductivities of LSCF materials. The results show that the electrochemically induced interface is most likely resulting from the incorporation of oxygen species and cation interdiffusion under cathodic polarization conditions. However, the electrocatalytic activity of electrochemically induced electrode/electrolyte interfaces is comparable to the thermally induced interfaces for the O2 reduction reaction under SOFC operation conditions. © The Author(s) 2015. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any