Validation of a physically-based solid oxide fuel cell anode model combining 3D tomography and impedance spectroscopy
Validation of a physically-based solid oxide fuel cell anode model combining 3D tomography and impedance spectroscopy
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DOI：
10.1016/j.ijhydene.2016.09.100
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发表时间：
2016-12
影响因子：
7.2
通讯作者：
A. Bertei;E. Ruiz-Trejo;Farid Tariq;V. Yufit;A. Atkinson;N. Brandon
中科院分区：
文献类型：
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作者：
A. Bertei;E. Ruiz-Trejo;Farid Tariq;V. Yufit;A. Atkinson;N. Brandon
提出了一种基于物理的固体氧化物燃料电池（SOFC）复合阳极阻抗谱模拟模型。该模型考虑了沿阳极厚度沿着分布的三相界面上的电荷输运和电荷转移反应，以及电极/电解质界面上的现象和试验台中的多组分气体扩散。该模型与金属陶瓷阳极的镍和氧化钪稳定的氧化锆制成的实验阻抗谱进行校准，并在具有不同的微观结构特性的电极中令人满意地验证，通过聚焦离子束SEM断层扫描量化。除了提供电化学氢氧化的材料特定的动力学参数，这项研究表明，电极的微观结构和电化学性能之间的相关性可以成功地解决结合基于物理的建模，阻抗谱和三维断层扫描。这种方法克服了唯象等效电路的局限性，适用于实验数据的解释和电极微观结构的优化。
This study presents a physically-based model for the simulation of impedance spectra in solid oxide fuel cell (SOFC) composite anodes. The model takes into account the charge transport and the charge-transfer reaction at the three-phase boundary distributed along the anode thickness, as well as the phenomena at the electrode/electrolyte interface and the multicomponent gas diffusion in the test rig. The model is calibrated with experimental impedance spectra of cermet anodes made of nickel and scandia-stabilized zirconia and satisfactorily validated in electrodes with different microstructural properties, quantified through focused ion beam SEM tomography. Besides providing the material-specific kinetic parameters of the electrochemical hydrogen oxidation, this study shows that the correlation between electrode microstructure and electrochemical performance can be successfully addressed by combining physically-based modelling, impedance spectroscopy and 3D tomography. This approach overcomes the limits of phenomenological equivalent circuits and is suitable for the interpretation of experimental data and for the optimisation of the electrode microstructure.