Revealing the degradation mechanism of calcium-based air electrodes in reversible solid oxide cells under chromium contaminants

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-11-06 DOI:10.1016/j.jeurceramsoc.2024.117058

Panpan Zhang , Yi Tang , Junmeng Jing , Ziwei Zheng , Jieshan Chang , Haoran Wang , Qi Wang , Zheng Yang , Zhibin Yang

{"title":"Revealing the degradation mechanism of calcium-based air electrodes in reversible solid oxide cells under chromium contaminants","authors":"Panpan Zhang , Yi Tang , Junmeng Jing , Ziwei Zheng , Jieshan Chang , Haoran Wang , Qi Wang , Zheng Yang , Zhibin Yang","doi":"10.1016/j.jeurceramsoc.2024.117058","DOIUrl":null,"url":null,"abstract":"<div><div>Calcium-based perovskite La<sub>0.6</sub>Ca<sub>0.4</sub>Fe<sub>0.8</sub>Co<sub>0.2</sub>O<sub>3-δ</sub> (LCFC) with stable structure is the promising air electrode used in reversible solid oxide cells, and its application in cell stack must consider its Cr poisoning resistance ability. Herein, the Cr poisoning effect of it is studied in this work. The results indicate the strong reaction between LCFC and the Cr contaminations, forming undesirable CaCrO<sub>4</sub> impurities, which significantly reduce the activity of ORR/OER. Both the decayed performance and reversible stability are also observed in SOFC and SOEC modes under the Cr contaminations, and the main reason comes from the reduced activity of the oxygen surface exchange processes and the blocked gas diffusion process by the impurities. A worse degenerated performance in SOFC mode than that in SOEC mode is also found in this work. Beyond that, the mechanism of the reaction between chromium contaminants and the Ca-segregation of the electrodes is discussed by the nucleation theory.</div></div>","PeriodicalId":17408,"journal":{"name":"Journal of The European Ceramic Society","volume":"45 4","pages":"Article 117058"},"PeriodicalIF":5.8000,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of The European Ceramic Society","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0955221924009312","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}

引用次数: 0

Abstract

Calcium-based perovskite La_0.6Ca_0.4Fe_0.8Co_0.2O_3-δ (LCFC) with stable structure is the promising air electrode used in reversible solid oxide cells, and its application in cell stack must consider its Cr poisoning resistance ability. Herein, the Cr poisoning effect of it is studied in this work. The results indicate the strong reaction between LCFC and the Cr contaminations, forming undesirable CaCrO₄ impurities, which significantly reduce the activity of ORR/OER. Both the decayed performance and reversible stability are also observed in SOFC and SOEC modes under the Cr contaminations, and the main reason comes from the reduced activity of the oxygen surface exchange processes and the blocked gas diffusion process by the impurities. A worse degenerated performance in SOFC mode than that in SOEC mode is also found in this work. Beyond that, the mechanism of the reaction between chromium contaminants and the Ca-segregation of the electrodes is discussed by the nucleation theory.

查看原文本刊更多论文

揭示铬污染物条件下可逆式固体氧化物电池中钙基空气电极的降解机制

结构稳定的钙基包晶 La0.6Ca0.4Fe0.8Co0.2O3-δ （LCFC）是可逆固体氧化物电池中很有前途的空气电极，其在电池堆中的应用必须考虑其抗铬中毒能力。本研究对其抗铬中毒效应进行了研究。结果表明，LCFC 与铬污染发生了强烈反应，形成了不良的 CaCrO4 杂质，显著降低了 ORR/OER 的活性。在铬污染下，SOFC 和 SOEC 模式也出现了性能下降和可逆稳定性降低的现象，其主要原因是氧表面交换过程的活性降低以及杂质阻碍了气体扩散过程。在这项研究中还发现，SOFC 模式的退化性能比 SOEC 模式的退化性能更差。除此以外，还通过成核理论讨论了铬污染物与电极的 Ca 沉淀之间的反应机理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.