Journal article
High-Entropy Perovskite as a High-Performing Chromium-Tolerant Cathode for Solid Oxide Fuel Cells
ACS Applied Materials & Interfaces, Vol.14(21), pp.24363-24373
2022
Abstract
To achieve chromium tolerance and high performance, a new series of high-entropy perovskites (HEPs) are investigated as cathode materials for solid oxide fuel cells (SOFCs). Multiple rare-earth, alkaline-earth, and high-order transition metal elements are used for the A-site of this ABO3 structure. A pure phase is achieved through the designed combination of different elements in seven out of eight candidates. Due to the retaining of alkaline-earth elements Sr and/or Ba, the electrical conductivities of these HEPs are in the order of 100 S/cm at 550–700 °C, a value that can practically eliminate the electronic resistance of the porous cathode. Three out of eight candidates show similar or better performance than the (La0.6Sr0.4)(Co0.2Fe0.8)O3−δ (LSCF) benchmark. It is found that A-site elements can cast a substantial influence on the overall performance even with a change as small as 10% of the total cations. It seems that each element has its individual “phenomenal activity” that can be transferred from one candidate to the other in the general setting of the perovskite structure, leading to the best candidate by using the three most active elements simultaneously at the A-site. Excellent Cr tolerance has been observed on the (La0.2Sr0.2Pr0.2Y0.2Ba0.2)Co0.2Fe0.8O3−δ sample, showing degradation of only 0.25%/kh during a 41 day operation in the presence of Cr, while LSCF increases by 100% within the first day in the same condition. X-ray photoelectron spectroscopy discovers no Sr segregation as LSCF is found in this HEP; rather, the active element Y takes more A-sites on the outermost layer after long-term operation.
Details
- Title
- High-Entropy Perovskite as a High-Performing Chromium-Tolerant Cathode for Solid Oxide Fuel Cells
- Authors/Creators
- Z. Li (Author/Creator) - West Virginia UniversityB. Guan (Author/Creator) - West Virginia UniversityF. Xia (Author/Creator) - Murdoch UniversityJ. Nie (Author/Creator) - University of California San DiegoW. Li (Author/Creator) - West Virginia UniversityL. Ma (Author/Creator) - West Virginia UniversityW. Li (Author/Creator) - West Virginia UniversityL. Zhou (Author/Creator) - West Virginia UniversityY. Wang (Author/Creator) - West Virginia UniversityH. Tian (Author/Creator) - West Virginia UniversityJ. Luo (Author/Creator) - University of California San DiegoY. Chen (Author/Creator) - Oak Ridge National LaboratoryM. Frost (Author/Creator) - Oak Ridge National LaboratoryK. An (Author/Creator) - Oak Ridge National LaboratoryX. Liu (Author/Creator) - West Virginia University
- Publication Details
- ACS Applied Materials & Interfaces, Vol.14(21), pp.24363-24373
- Publisher
- American Chemical Society
- Identifiers
- 991005540878607891
- Copyright
- © 2022 American Chemical Society
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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Source: InCites
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- Collaboration types
- Domestic collaboration
- International collaboration
- Citation topics
- 5 Physics
- 5.77 Applied Physics
- 5.77.285 Solid Oxide Fuel Cell
- Web Of Science research areas
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- ESI research areas
- Materials Science