The Effect of the Method of Formation of Pr2CuO4-Based Cathodes on the Electrochemical Characteristics of Planar Electrolyte-Supported SOFCs

IF 1.1 4区工程技术 Q4 ELECTROCHEMISTRY Russian Journal of Electrochemistry Pub Date : 2024-01-16 DOI:10.1134/s1023193523120042

Yu. O. Dobrovol’skii, N. V. Lyskov, G. N. Mazo

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Abstract

The studies of how the method of organization of the microstructure of Pr₂CuO₄-based (РСО) cathodes affects the electrochemical characteristics of model electrolyte-supported solid oxide fuel cells (SOFCs) are carried out. It is shown that the higher thickness of the PCO cathode layer and the introduction of a pore-forming agent increase the power density of tested SOFCs as compared with the cathodes of the unmodified structure with the power density of 34 mW/cm² at 850°С. The optimal thickness of the cathode layer corresponding to the maximum electrochemical performance is found to lie in the interval of 40–50 µm, which allows the power density of 116 mW/cm² at 850°С to be reached. At the same time, with the transition from single-phase PCO cathodes to the composite PCO–Ce_0.9Gd_0.1O_1.95 (60/40 wt %) cathodes the power density increases to 130 mW/cm² at 850°С and the dynamics of its decrease with the decrease in temperature slows down. The analysis of impedance spectroscopy data on the total polarization resistance of model SOFCs with cathodes prepared by different methods shows that the transition from unmodified cells to cells with the thicker cathodic layer and also with composite cathodes decreases the level of polarization losses two-fold (in the former case) and three-fold (in the latter case). This is accompanied by the increase in the power density. The proposed methods of modifying the microstructure of the PCO-based cathode demonstrate the positive dynamics of growth of both the electrochemical performance of the cathode/electrolyte interface and the power density characteristics of the fuel cell as a whole.

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基于 Pr2CuO4 的阴极的形成方法对平面电解质支撑型 SOFC 的电化学特性的影响

摘要研究了基于 Pr2CuO4（РСО）阴极的微结构组织方法如何影响模型电解质支持的固体氧化物燃料电池（SOFC）的电化学特性。结果表明，与未修改结构的阴极相比，较厚的 PCO 阴极层和孔隙形成剂的引入提高了测试 SOFC 的功率密度，850°С 时的功率密度为 34 mW/cm2。与最大电化学性能相对应的阴极层最佳厚度在 40-50 微米之间，这使得 850°С 时的功率密度达到 116 mW/cm2。同时，随着单相 PCO 阴极向复合 PCO-Ce0.9Gd0.1O1.95 （60/40 wt %）阴极的过渡，850°С 时的功率密度增加到 130 mW/cm2，并且随着温度的降低，功率密度下降的动态也放缓了。对采用不同方法制备阴极的 SOFC 模型总极化电阻的阻抗光谱数据进行分析后发现，从未修改电池到采用较厚阴极层以及复合阴极的电池，极化损耗水平分别降低了两倍（前者）和三倍（后者）。同时，功率密度也有所提高。所提出的改变基于 PCO 阴极微观结构的方法表明，阴极/电解质界面的电化学性能和燃料电池整体的功率密度特性都有积极的动态增长。

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来源期刊

Russian Journal of Electrochemistry 工程技术-电化学

CiteScore

1.90

自引率

8.30%

发文量

102

审稿时长

6 months

期刊介绍： Russian Journal of Electrochemistry is a journal that covers all aspects of research in modern electrochemistry. The journal welcomes submissions in English or Russian regardless of country and nationality of authors.