A highly oxygen reduction reaction active and CO2 durable high-entropy cathode for solid oxide fuel cells

He, Fan; Zhu, Feng; Xu, Kang; Xu, Yangsen; Liu, Dongliang; Yang, Guangming; Sasaki, Kotaro; Choi, YongMan; Chen, Yu

doi:10.1016/j.apcatb.2024.124175

Title: A highly oxygen reduction reaction active and CO₂ durable high-entropy cathode for solid oxide fuel cells

Journal Article · 09 May 2024 · Applied Catalysis. B, Environmental

DOI: https://doi.org/10.1016/j.apcatb.2024.124175 · OSTI ID:2500289

He, Fan ^[1]; Zhu, Feng ^[1]; Xu, Kang ^[1]; Xu, Yangsen ^[2]; Liu, Dongliang ^[2]; Yang, Guangming ^[2]; Sasaki, Kotaro ^[3];

^[4];

^[1]

South China University of Technology (SCUT), Guangzhou (China)
Nanjing Tech University (China)
Brookhaven National Laboratory (BNL), Upton, NY (United States)
National Yang Ming Chiao Tung University, Tainan (Taiwan)

One big obstacle for the oxygen reduction reaction (ORR) electrode in solid oxide fuel cells (SOFCs) is the poor reaction activity and fast degradations caused by CO₂ poisoning. Here, in this study, we report our design of an active A-site Ca-rich high-entropy Pr_0.1875Ba_0.1875Sr_0.1875La_0.1875Ca_0.25CoO_3-δ (PBSLC₂₅C) electrode, guided by the O p-band theory. Here, when applied as a cathode in solid oxide fuel cells (SOFCs), it demonstrates high ORR activity and excellent CO₂ tolerance under realistic operating conditions. Ni-YSZ-based anode-supported cells with PBSLC₂₅C cathodes demonstrate excellent peak power densities of 1.14 W cm^-2, 1.04 W cm^-2, and 0.77 W cm^-2 in the air with 1%, 5%, and 10% CO₂, respectively, at 750 °C. The engineered high-entropy PBSLC₂₅C effectively diminishes the CO₂ poisoning effect and maintains active surfaces for fast oxygen exchange, as confirmed by the cell durability test in air containing CO₂ (5 and 10 vol%), Raman spectroscopy, and density functional theory calculations.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: Introduced Innovative R&D Team of Guangdong; National Natural Science Foundation of China (NSFC); National Science and Technology Council (NSTC); USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012704

OSTI ID:: 2500289

Report Number(s):: BNL--226462-2025-JAAM

Journal Information:: Applied Catalysis. B, Environmental, Journal Name: Applied Catalysis. B, Environmental Vol. 355; ISSN 0926-3373

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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CO2 tolerance
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Title: A highly oxygen reduction reaction active and CO2 durable high-entropy cathode for solid oxide fuel cells

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Title: A highly oxygen reduction reaction active and CO₂ durable high-entropy cathode for solid oxide fuel cells