Operando observations of active three phase boundary of patterned nickel - Yttria stabilized zirconia electrode in solid oxide cell
Operando observations of active three phase boundary of patterned nickel - Yttria stabilized zirconia electrode in solid oxide cell
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DOI：
10.1016/j.jpowsour.2022.231228
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发表时间：
2022-03
影响因子：
9.2
通讯作者：
Zhufeng Ouyang;Y. Komatsu;A. Sciazko;J. Onishi;K. Nishimura;N. Shikazono
中科院分区：
文献类型：
--
作者：
Zhufeng Ouyang;Y. Komatsu;A. Sciazko;J. Onishi;K. Nishimura;N. Shikazono
在固体氧化物燃料电池（SOFC）和固体氧化物电解电池（SOECs）中，镍（Ni）-氧化钇稳定的氧化锆（YSZ）燃料电极的显著性能退化已经成为商业化的日益增长的挑战。Ni-YSZ电极在长期使用过程中，由于Ni相的重新分布，电极的微观结构不稳定。在本研究中，图案化镍膜电极在SOFC，SOEC和可逆固体氧化物电池（RSOC）的操作模式下进行了操作观察。采用共聚焦激光扫描显微镜对YSZ表面的三相界面进行了实时显微成像，研究了三种工作模式下Ni在YSZ表面的迁移率。实验观察表明，Ni相仅在SOFC模式下动态扩散和分裂，而在SOEC模式下没有观察到这种现象。无论操作模式如何，都会发生Ni粗化。活性TPB的动态运动定性地与操作期间电流密度的变化相关。运行后，Ni在YSZ平坦表面上的接触角最小的是SOFC，其次是RSOC，最大的是SOEC。润湿性的改变与镍的团聚之间的竞争最终决定了镍的复杂形态变化。
In solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs), the substantial performance degradation of nickel (Ni) - yttria-stabilized zirconia (YSZ) fuel electrode has been a growing challenge for commercialization. The microstructure of Ni-YSZ electrode is not stable during long-term operation due to Ni phase redistribution. In the present study,operandoobservations of patterned Ni film electrodes under SOFC, SOEC and reversible solid oxide cell (RSOC) operation modes are conducted. Confocal laser scanning microscopy is applied to acquire real-time microscopy images of the three phase boundary (TPB) under three operation modes to study the Ni mobility on the YSZ surface. Theoperandoobservation showed that the Ni phase dynamically spreads and splits up only under the SOFC mode, while this phenomenon is not observed under the SOEC mode. Ni coarsening occurs regardless of the operation mode. The dynamic motion of active TPB qualitatively correlates with the variation in the current density during the operation. The contact angles of Ni on flat YSZ surface after operation are the smallest for SOFC, followed by RSOC and the largest for SOEC. Competition between the altered Ni wettability and the Ni agglomeration finally determines the complicated Ni morphological changes.