Efficient protection of metal interconnect in fuel electrode atmosphere for direct methanol solid oxide fuel cells via La0.2Sr0.8TiO3-δ coating

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-09-27 DOI:10.1016/j.jeurceramsoc.2025.117853

Xiangchen Wu , Jun Yang , Wu Liu , Liangzhu Zhu , Yang Zhang , Beibei Han , Maorong Chai , Wanbing Guan , Junkang Sang

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Abstract

Metallic interconnects in direct methanol solid oxide fuel cells (SOFCs) are prone to being oxidized during operation, leading to electrical degradation and compromising the overall performance of the stack. The oxidation behavior of SUS441 stainless steel and the protective effect of a La_0.2Sr_0.8TiO_3-δ (LST) coating were investigated under a methanol-steam atmosphere at 750°C, relevant to anode atmosphere. LST coatings, synthesized via solid-state reaction and was applied by screen printing. After 1000 h oxidation, coated SUS441 formed only a ≈ 4.8 μm thick oxide scale, compared to ≈ 11.6 μm on uncoated steel. The area-specific resistance increased moderately (9.67–16.36 mΩ·cm²), significantly lower than uncoated samples (216.46 mΩ·cm²). The oxidation rate constant decreased by an order of magnitude. These results highlight the efficiency of LST coating in enhancing oxidation resistance and electrical stability. Furthermore, the details about protective mechanisms of LST coating are illustrated.

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La0.2Sr0.8TiO3-δ涂层对直接甲醇固体氧化物燃料电池燃料电极气氛中金属互连的有效保护

直接甲醇固体氧化物燃料电池（sofc）中的金属互连在运行过程中容易被氧化，导致电气性能下降并影响电池组的整体性能。在与阳极气氛相关的750℃甲醇-蒸汽气氛下，研究了SUS441不锈钢的氧化行为和La0.2Sr0.8TiO3-δ (LST)涂层的保护作用。采用固相反应合成LST涂层，并通过丝网印刷进行应用。经过1000 h氧化后，涂层的SUS441仅形成≈ 4.8 μm厚的氧化皮，而未涂层的SUS441形成≈ 11.6 μm厚的氧化皮。面积比电阻略有增加（9.67 ~ 16.36 mΩ·cm²），显著低于未涂覆样品（216.46 mΩ·cm²）。氧化速率常数下降了一个数量级。这些结果突出了LST涂层在提高抗氧化性和电稳定性方面的效率。此外，还详细阐述了LST涂层的保护机理。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.