A-site entropy engineering to enhance performance of rare-earth iron perovskite cathode for solid oxide fuel cells

IF 7.5 1区工程技术 Q2 ENERGY & FUELS

Fuel Pub Date : 2025-04-10 DOI:10.1016/j.fuel.2025.135288

Halefom G. Desta , Gebrehiwot Gebreslassie , Guoqing Wang , Yijun Cheng , Mengyuan Sun , Xinwei Gong , Shiyue Zhu , Dong Tian , Pengfei Xu , Bin Lin

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Abstract

Solid oxide fuel cells (SOFCs) are promising energy conversion devices due to their high efficiency and low emissions. However, their commercialization is hindered by high operating temperatures, interfacial reactions, and durability issues. Here, we report a high-entropy perovskite cathode, (La_0.2Pr_0.2Nd_0.2Ba_0.2Sr_0.2)FeO_3-δ (HE-LSF), designed to enhance electrochemical performance and durability at intermediate temperatures for SOFCs. HE-LSF exhibits superior oxygen reduction reaction (ORR) activity, higher electrical conductivity (46–115 S cm⁻¹), and improved thermal stability compared to LSF. Symmetrical cells with HE-LSF exhibit lower polarization resistance (R_p) and better stability over 35 h at 750 °C. A single-cell utilizing HE-LSF as cathode achieves a peak power density of 910 mW cm² at 800 °C, with negligible performance decay observed over 90 h of continuous operation. These findings highlight the potential of high-entropy materials for developing efficient and durable SOFCs.

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提高固体氧化物燃料电池稀土铁钙钛矿阴极性能的a位熵工程

固体氧化物燃料电池（sofc）以其高效、低排放的特点成为一种很有前途的能量转换设备。然而，它们的商业化受到高温、界面反应和耐久性问题的阻碍。在这里，我们报道了一种高熵钙钛矿阴极，（La0.2Pr0.2Nd0.2Ba0.2Sr0.2）FeO3-δ (HE-LSF)，旨在提高sofc在中温下的电化学性能和耐久性。与LSF相比，HE-LSF表现出更强的氧还原反应（ORR）活性、更高的电导率（46-115 S cm−1）和更好的热稳定性。HE-LSF的对称电池具有较低的极化电阻（Rp）和较好的稳定性，在750°C下加热35 h。使用HE-LSF作为阴极的单电池在800°C下达到910 mW cm2的峰值功率密度，在连续工作90小时内观察到的性能衰减可以忽略不计。这些发现突出了高熵材料在开发高效耐用sofc方面的潜力。

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来源期刊

Fuel 工程技术-工程：化工

CiteScore

12.80

自引率

20.30%

发文量

3506

审稿时长

64 days

期刊介绍： The exploration of energy sources remains a critical matter of study. For the past nine decades, fuel has consistently held the forefront in primary research efforts within the field of energy science. This area of investigation encompasses a wide range of subjects, with a particular emphasis on emerging concerns like environmental factors and pollution.