Cobalt-Free High-Entropy Perovskite La0.2Pr0.2Nd0.2Sm0.2Sr0.2FeO3–δ Solid Oxide Cell Air Electrode With Enhanced Performance

IF 2.6 4区 工程技术 Q3 ELECTROCHEMISTRY
Fuel Cells Pub Date : 2024-06-26 DOI:10.1002/fuce.202400068
Patrick Pretschuh, Andreas Egger, Priya Paulachan, Johanna Schöggl, Roland Brunner, Edith Bucher
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Abstract

This study investigates the novel cobalt-free high-entropy perovskite, La0.2Pr0.2Nd0.2Sm0.2Sr0.2FeO3–δ (LPNSSF), as an air electrode material for solid oxide cells (SOCs). When testing a button cell with a single-phase LPNSSF electrode, a current density of 0.55 A cm−2 is obtained at 0.7 V in fuel cell mode at 800°C. In order to mitigate the moderate electronic conductivity of LPNSSF, two approaches are explored. Incorporating a Co-free highly conductive perovskite, LaNi0.6Fe0.4O3–δ (LNF), either as an LPNSSF–LNF composite electrode or as a current collector layer (CCL), enhances the performance to 0.61 and 0.66 A cm−2, respectively, under the same conditions. Microstructural features are studied by electron microscopy and show a rather dense structure of the CCL. Optimization of the current collector increases the current density further to 0.96 A cm−2 at 0.7 V in a 5 × 5 cm2 anode-supported cell at 800°C. This cell exhibits good long-term stability in electrolysis mode in H2-H2O with 80% humidification. Continuous polarization of −0.69 A cm−2 is sustained for 1000 h, with an average degradation rate of 10 mV kh−1 after an initial run-in phase. These findings demonstrate the promising performance and durability of LPNSSF as cobalt-free SOC air electrode.

Abstract Image

性能更强的无钴高熵过氧化物 La0.2Pr0.2Nd0.2Sm0.2Sr0.2FeO3-δ 固体氧化物电池空气电极
本研究探讨了新型无钴高熵包晶 La0.2Pr0.2Nd0.2Sm0.2Sr0.2FeO3-δ (LPNSSF),将其作为固体氧化物电池 (SOC) 的空气电极材料。使用单相 LPNSSF 电极测试纽扣电池时,在 800°C 燃料电池模式下,0.7 V 电压下的电流密度为 0.55 A cm-2。为了减轻 LPNSSF 的适度电子导电性,我们探索了两种方法。在相同的条件下,加入无钴高导电性包晶石 LaNi0.6Fe0.4O3-δ (LNF) 作为 LPNSSF-LNF 复合电极或集流层 (CCL),可将性能分别提高到 0.61 和 0.66 A cm-2。电子显微镜对微观结构特征进行了研究,结果表明 CCL 的结构相当致密。优化集流器后,在 800°C 条件下,5 × 5 cm2 阳极支撑电池在 0.7 V 下的电流密度进一步提高到 0.96 A cm-2。这种电池在 80% 加湿的 H2-H2O 电解模式下表现出良好的长期稳定性。在初始磨合阶段之后,-0.69 A cm-2 的连续极化可持续 1000 小时,平均降解率为 10 mV kh-1。这些研究结果表明,LPNSSF 作为无钴 SOC 空气电极具有良好的性能和耐用性。
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来源期刊
Fuel Cells
Fuel Cells 工程技术-电化学
CiteScore
5.80
自引率
3.60%
发文量
31
审稿时长
3.7 months
期刊介绍: This journal is only available online from 2011 onwards. Fuel Cells — From Fundamentals to Systems publishes on all aspects of fuel cells, ranging from their molecular basis to their applications in systems such as power plants, road vehicles and power sources in portables. Fuel Cells is a platform for scientific exchange in a diverse interdisciplinary field. All related work in -chemistry- materials science- physics- chemical engineering- electrical engineering- mechanical engineering- is included. Fuel Cells—From Fundamentals to Systems has an International Editorial Board and Editorial Advisory Board, with each Editor being a renowned expert representing a key discipline in the field from either a distinguished academic institution or one of the globally leading companies. Fuel Cells—From Fundamentals to Systems is designed to meet the needs of scientists and engineers who are actively working in the field. Until now, information on materials, stack technology and system approaches has been dispersed over a number of traditional scientific journals dedicated to classical disciplines such as electrochemistry, materials science or power technology. Fuel Cells—From Fundamentals to Systems concentrates on the publication of peer-reviewed original research papers and reviews.
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