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Publishing Language: Chinese

Preparation and Evaluation of High Performance SOFC Thin Film Oxygen Electrode La0.6Sr0.4Co0.2Fe0.8O3-δ-Gd0.1Ce0.9O1.95

Zhangwei WANG1,3, Linghong LUO1,3(), Liang CHENG2,3, Leying WANG1,3, Xu XU1,3, Jianfeng YU1,3, Shaoshuai LIU1,3, Shuangshuang ZHANG1,3
School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China
National Engineering Research Center for Domestic & Building Ceramics, Jingdezhen Ceramic University, Jingdezhen 333001, Jiangxi, China
Jiangxi Provincial Key Laboratory of Fuel Cell Materials and Devices, Jingdezhen 333001, Jiangxi, China
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Abstract

The relationship between the thickness and electrochemical performance of La0.6Sr0.4Co0.2Fe0.8O3-δ-Gd0.1Ce0.9O1.95 oxygen electrode was studied by using a symmetrical oxygen electrode cell. Electrochemical impedance spectroscopies of the oxygen electrode with thicknesses of 5–22 μm were measured at various open-circuit voltages. The electrochemical impedance spectra and cyclic voltammetry curves of the fuel supported button cells with oxygen electrodes of different thicknesses were also tested. It is found that the total polarization impedance (Rp) changes with thickness change of the oxygen electrode. The total polarization impedance is derived from oxygen ion transfer, oxygen surface exchange and oxygen diffusion. By analyzing the impedances of different processes, it can be found that the high frequency oxygen ion transport process has a weak dependence on the oxygen electrode thickness. The surface exchange and diffusion of oxygen are strongly dependent on thickness of the oxygen electrode. The electrochemical performance of the oxygen electrode can be improved by optimizing the thickness. The lowest value of resistance is reached at 12 μm, which is 0.034 Ω·cm2 at 750 ℃. Accordingly, the maximum power density of the fuel electrode supported button cell (NiO-YSZ||YSZ||20GDC||LSCF-10GDC) is 1098 mW·cm-2, with 3 vol.% H2O + 97 vol.% H2 as fuel and static air as oxidant at 800 ℃. Because the optimal thickness of the oxygen electrode obtained is only about half of the thickness of the currently similar oxygen electrode, the concept of “thin film oxygen electrode” was proposed for possible commercialization.

Keywords

SOFCLa0.6Sr0.4Co0.2Fe0.8O3-δ-Gd0.1Ce0.9O1.95oxygen electrode thicknesselectrochemical properties
CLC number: TQ174.75 Document code: A Article ID: 1000-2278(2023)04-0751-10

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Journal of Ceramics
Volume 44 Issue 4,
August 2023
Pages 751-760
DOI: 10.13957/j.cnki.tcxb.2023.04.016
Cite this article:
WANG Z, LUO L, CHENG L, et al. Preparation and Evaluation of High Performance SOFC Thin Film Oxygen Electrode La0.6Sr0.4Co0.2Fe0.8O3-δ-Gd0.1Ce0.9O1.95. Journal of Ceramics, 2023, 44(4): 751-760. https://doi.org/10.13957/j.cnki.tcxb.2023.04.016
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