Huang Dehong, Wu Shanglan, Wang Yi, Zhang Zhenbao, Chen Dengjie
College of Chemistry and Materials Science, Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Guangdong Engineering & Technology Research Centre of Graphene-Like Materials and Products, Jinan University, Guangzhou 510632, China.
College of Chemistry and Materials Science, Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Guangdong Engineering & Technology Research Centre of Graphene-Like Materials and Products, Jinan University, Guangzhou 510632, China.
J Colloid Interface Sci. 2024 Apr;659:276-288. doi: 10.1016/j.jcis.2023.12.169. Epub 2023 Dec 30.
Lowering the operating temperatures of solid-oxide fuel cells (SOFCs) is critical, although achieving success in this endeavor has proven challenging. Herein, BiSrCoFeO (BiSCF) is systematically evaluated as a carbon dioxide (CO)-tolerant and highly active cathode for SOFCs. BiSCF, which features Bi with an ionic radius similar to Ba, exhibits activity (e.g., 0.062 Ω cm at 700 °C) comparable to that of BaSrCoFeO and PrBaCoO, while demonstrating a considerable advantage over Bi-doped cathodes. Moreover, BiSCF exhibits long-term stability over a period of 500 h, and an anode-supported cell with BiSCF achieves a power density of 912 mW cm at 650 °C. The CO-poisoned BiSCF exhibits quick reversibility or slight activation after returning to normal conditions. The exceptional CO tolerance of BiSCF can be attributed to its reduced basicity and high electronegativity, which effectively restrict surface Sr diffusion and hinder subsequent carbonate formation. These findings highlight the substantial potential of BiSCF for SOFCs operating below 700 °C.
降低固体氧化物燃料电池（SOFC）的工作温度至关重要，尽管在这方面取得成功已被证明具有挑战性。在此，对BiSrCoFeO（BiSCF）作为一种耐二氧化碳（CO）且活性高的SOFC阴极进行了系统评估。BiSCF中Bi的离子半径与Ba相似，其活性（例如在700°C时为0.062Ω·cm）与BaSrCoFeO和PrBaCoO相当，同时相对于Bi掺杂阴极具有显著优势。此外，BiSCF在500小时内表现出长期稳定性，具有BiSCF的阳极支撑电池在650°C时实现了912 mW/cm²的功率密度。CO中毒的BiSCF在恢复到正常条件后表现出快速的可逆性或轻微的活化。BiSCF对CO的卓越耐受性可归因于其降低的碱性和高电负性，这有效地限制了表面Sr扩散并阻碍了随后碳酸盐的形成。这些发现突出了BiSCF在低于700°C运行的SOFC中的巨大潜力。
