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Study of Electrochemical and Crystallographic Changes During Initial Stabilization of La0.75Sr0.25Cr0.5Mn0.3Ni0.2O3−δ Reversible Solid Oxide Cell Electrode
Fuel Cells ( IF 2.8 ) Pub Date : 2020-12-14 , DOI: 10.1002/fuce.202000104
O. Korjus 1 , J. Aruväli 2 , P. Paiste 2 , K. Kooser 3, 4 , S. Granroth 3 , H. Mändar 4 , M. Kodu 4 , R. Härmas 1 , M. Maide 1 , M. Ainsar 1 , E. Lust 1 , G. Nurk 1
Affiliation  

The electrochemical and crystalline structure of mixed ionic‐electronic conductive La0.75Sr0.25Cr0.5Mn0.3Ni0.2O3–δ (LSCMN) electrode in porous scandia ceria stabilized zirconia (ScCeSZ) electrolyte matrix during the first 140 h has been studied in an operando XRD experiment. Intense degradation of electrochemical performance in a fuel cell as well as in electrolysis modes has been observed. However, the mechanism of the degradation was seen to be different for the two operation modes. The formation of the new ceramic phase was observed on the surface of the electrode using the Grazing incidence X‐ray diffraction at the pulsed laser deposited LSCMN model electrode. Instability of the LSCMN phase in the ScCeSZ matrix at SOFC working conditions has been demonstrated using the novel operando XRD technique. The decrease in wt.% of the LSCMN during degradation was approximately 27 ± 4.5%. A slow increase of the ScCeSZ lattice parameter was observed and attributed to the doping of electrolytes with some LSCMN components.

中文翻译:

La0.75Sr0.25Cr0.5Mn0.3Ni0.2O3-δ可逆固体氧化物电池电极初始稳定过程中的电化学和晶体学变化研究

研究了混合离子电导La 0.75 Sr 0.25 Cr 0.5 Mn 0.3 Ni 0.2 O 3–δ(LSCMN)电极在前140 h多孔氧化rc稳定氧化锆(ScCeSZ)电解质基质中的电化学和晶体结构。操作XRD实验。已经观察到燃料电池以及电解模式中电化学性能的严重降低。然而,对于两种操作模式,降解机理被认为是不同的。在脉冲激光沉积的LSCMN模型电极上使用Grazing入射X射线衍射在电极表面观察到了新的陶瓷相的形成。使用新型操作XRD技术已证明在SOFC工作条件下ScCeSZ矩阵中LSCMN相的不稳定性。降解过程中LSMCN的wt。%降低约为27±4.5%。观察到ScCeSZ晶格参数的缓慢增加,这归因于电解质中掺杂了一些LSCMN组分。
更新日期:2020-12-18
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