NdBaFe2–x Co x O5+δ Double Perovskites with Exsolved Co–Fe Alloy Nanoparticles as Highly Efficient and Stable Anodes for Direct Hydrocarbon Solid Oxide Fuel Cells
Exsolution of transition metals in perovskites is a potential way to improve the catalytic activity of fuel cell anode materials. In this work, the double-perovskite anodes PR-NdBaFe2–x Co x O5+δ (x = 0.1, 0.2; PR-NBFC10, PR-NBFC20) with the exsolved Co0.72Fe0.28 metal alloy nanoparticles were obtai...
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Veröffentlicht in: | ACS applied energy materials 2021-01, Vol.4 (1), p.134-145 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Exsolution of transition metals in perovskites is a potential way to improve the catalytic activity of fuel cell anode materials. In this work, the double-perovskite anodes PR-NdBaFe2–x Co x O5+δ (x = 0.1, 0.2; PR-NBFC10, PR-NBFC20) with the exsolved Co0.72Fe0.28 metal alloy nanoparticles were obtained by heat treatment in 5% H2/Ar post-reduction at 850 °C. The exsolved Co–Fe alloy nanoparticle catalyst uniformly distributed on the surface of the cobalt-doped PR-NBFC10 and PR-NBFC20 ceramic anodes facilitates the catalytic activity compared with the undoped PR-NdBaFe2–x Co x O5+δ (x = 0; PR-NBFC0) anode. The maximum power density of single cells with PR-NBFC0, PR-NBFC10, and PR-NBFC20 anodes supported by a 200 μm thick La0.9Sr0.1Ga0.8Mg0.2O3−δ electrolyte at 850 °C in wet H2 reached 842, 1110, and 1247 mW cm–2, respectively. In addition, PR-NBFC0, PR-NBFC10, and PR-NBFC20 exhibit relatively stable output power in a wet CH4 fuel within 100 h of operation. Since the exsolved Co–Fe alloy nanoparticles have an embedded structure, they exhibit impressive anticoking properties, which greatly expand their application. The PR-NBFC double perovskite containing Co–Fe alloy nanoparticles offers possibilities for finding promising high-catalytic-activity and high-stability anodes for solid oxide fuel cells. |
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ISSN: | 2574-0962 2574-0962 |
DOI: | 10.1021/acsaem.0c02042 |