Stephanie E. Wolf, Vaibhav Vibhu, Carla L. Coll, Niklas Eyckeler, Izaak C. Vinke, Rudiger-A Eichel, L.G.J. (Bert) de Haart
{"title":"Long-Term Stability of Perovskite-Based Fuel Electrode Material Sr<sub>2</sub>Fe<sub>2-X</sub>Mo<sub>x</sub>O<sub>6-δ</sub> – GDC for Enhanced High-Temperature Steam and CO<sub>2</sub> Electrolysis","authors":"Stephanie E. Wolf, Vaibhav Vibhu, Carla L. Coll, Niklas Eyckeler, Izaak C. Vinke, Rudiger-A Eichel, L.G.J. (Bert) de Haart","doi":"10.1149/ma2023-0154329mtgabs","DOIUrl":null,"url":null,"abstract":"Solid oxide electrolysis cells (SOECs) have proven to be a highly efficient key technology to produce valuable gases (H 2 , CO). SOECs utilize renewably generated electricity at temperatures between 600 - 900 °C, thereby providing a carbon-neutral method for energy storage. However, the successful industrial implementation of this technology requires long-term stability of all system components and is mainly delayed by the degradation of the electrodes over time. The state-of-the-art Ni-YSZ fuel electrode has been extensively studied and exhibits severe performance loss due to Ni particle agglomeration and Ni migration away from the active sites at the electrolyte/electrode interface under real operating conditions [1]. To mitigate this issue, we have investigated the Ni-free perovskite Sr 2 Fe 2-x Mo x O 6-δ + 30% GDC as fuel electrode material. As mixed ionic and electronic (MIEC) perovskite structured oxides, these materials have shown excellent short-term redox stability in oxidizing and reducing atmospheres in addition to high conductivity and outstanding coking resistance [2]. These characteristics meet exactly the targeted requirements for new solid oxide electrolyzer materials. We have compared the long-term degradation of an SFM fuel electrode to an electrode made of SFM-GDC (Figure 1). The degradation was less severe for the mixed electrode of SFM-GDC. Impedance and post-test SEM-EDX analysis clarified the main degradation mechanisms of SFM as well as SFM-GDC in steam and CO 2 electrolysis. The tested button cells showed demixing of the SFM phase and particle aggomeration in the fuel electrode. [1] S. E. Wolf, V. Vibhu, E. Tröster, I. C. Vinke, R.-A. Eichel and L. G. J. de Haart, Energies , 15 (15), 5449 (2022). [2] L. Bernadet, C. Moncasi, M. Torrell and A. Tarancón, Int. J. Hydrog. Energy , 45 (28), 14208–14217 (2020). Figure 1","PeriodicalId":11461,"journal":{"name":"ECS Meeting Abstracts","volume":"13 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2023-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"ECS Meeting Abstracts","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1149/ma2023-0154329mtgabs","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Solid oxide electrolysis cells (SOECs) have proven to be a highly efficient key technology to produce valuable gases (H 2 , CO). SOECs utilize renewably generated electricity at temperatures between 600 - 900 °C, thereby providing a carbon-neutral method for energy storage. However, the successful industrial implementation of this technology requires long-term stability of all system components and is mainly delayed by the degradation of the electrodes over time. The state-of-the-art Ni-YSZ fuel electrode has been extensively studied and exhibits severe performance loss due to Ni particle agglomeration and Ni migration away from the active sites at the electrolyte/electrode interface under real operating conditions [1]. To mitigate this issue, we have investigated the Ni-free perovskite Sr 2 Fe 2-x Mo x O 6-δ + 30% GDC as fuel electrode material. As mixed ionic and electronic (MIEC) perovskite structured oxides, these materials have shown excellent short-term redox stability in oxidizing and reducing atmospheres in addition to high conductivity and outstanding coking resistance [2]. These characteristics meet exactly the targeted requirements for new solid oxide electrolyzer materials. We have compared the long-term degradation of an SFM fuel electrode to an electrode made of SFM-GDC (Figure 1). The degradation was less severe for the mixed electrode of SFM-GDC. Impedance and post-test SEM-EDX analysis clarified the main degradation mechanisms of SFM as well as SFM-GDC in steam and CO 2 electrolysis. The tested button cells showed demixing of the SFM phase and particle aggomeration in the fuel electrode. [1] S. E. Wolf, V. Vibhu, E. Tröster, I. C. Vinke, R.-A. Eichel and L. G. J. de Haart, Energies , 15 (15), 5449 (2022). [2] L. Bernadet, C. Moncasi, M. Torrell and A. Tarancón, Int. J. Hydrog. Energy , 45 (28), 14208–14217 (2020). Figure 1
固体氧化物电解电池(SOECs)已被证明是生产有价值气体(h2, CO)的高效关键技术。soec在600 - 900°C的温度下利用可再生能源发电,从而提供了一种碳中和的储能方法。然而,该技术的成功工业实施需要所有系统组件的长期稳定性,并且主要是由于电极随时间的退化而延迟。最先进的Ni- ysz燃料电极已经得到了广泛的研究,在实际操作条件下,由于Ni颗粒聚集和Ni从电解质/电极界面的活性位点迁移而导致严重的性能损失[1]。为了解决这个问题,我们研究了无ni钙钛矿Sr 2 Fe 2-x Mo x o6 -δ + 30% GDC作为燃料电极材料。作为混合离子和电子(MIEC)钙钛矿结构氧化物,这些材料除了具有高导电性和优异的抗焦化性能外,还在氧化和还原气氛中表现出优异的短期氧化还原稳定性。这些特性完全符合新型固体氧化物电解槽材料的目标要求。我们比较了SFM燃料电极和SFM- gdc制成的电极的长期降解情况(图1)。SFM- gdc混合电极的降解程度较轻。阻抗和测试后SEM-EDX分析明确了SFM以及SFM- gdc在蒸汽和CO 2电解中的主要降解机制。测试的纽扣电池显示燃料电极中SFM相的脱混和颗粒聚集。[1] S. E. Wolf, V. Vibhu, E. Tröster, I. C. Vinke, r . a。Eichel和L. G. J. de Haart,能源,15(15),5449(2022)。b[2] L. Bernadet, C. Moncasi, M. Torrell和A. Tarancón, Int。j . Hydrog。能源学报,45(28),14208-14217(2020)。图1