An active and stable hydrogen electrode of solid oxide cells with exsolved Fe–Co–Ni nanoparticles from Sr2FeCo0. 2Ni0. 2Mo0. 6O6-δ double-perovskite

Li, Cheng, Deng, Tatian, Yang, Liping, Liu, Bo, Yan, Dong, Fan, Liyuan, Li, Jian, and Jia, Lichao (2023) An active and stable hydrogen electrode of solid oxide cells with exsolved Fe–Co–Ni nanoparticles from Sr2FeCo0. 2Ni0. 2Mo0. 6O6-δ double-perovskite. Advanced Powder Materials, 2 (4). 100133.

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Abstract

Sr2FeCo0.2Ni0.2Mo0.6O6-δ (SFCNM) and Sr2FeNi0.4Mo0.6O6-δ (SFNM) were prepared as the hydrogen electrode materials for solid oxide cells (SOCs) and comparatively investigated by density function theory (DFT) and experiments to demonstrate the benefit of Co addition. The reduced SFCNM (R-SFCNM) and SFNM (R-SFNM) contain exsolved Fe–Co–Ni and Fe–Ni nanoparticles, respectively. DFT indicates that Fe–Co–Ni has optimized combination of the d-band center (descriptor of catalyst activity) and adsorption behavior for H2O, H2, H, and OH. The cell with SFCNM hydrogen electrode, La0.8Sr0.2Ga0.8Mg0.2O3-δ (LSGM) electrolyte, and La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) oxygen electrode (Cell-SFCNM) demonstrates a higher performance than that with an SFNM hydrogen electrode (Cell-SFNM) at temperatures between 700 and 850 °C in both solid oxide fuel cell (SOFC, 3% H2O-97% H2/air) and solid oxide electrolysis cell (SOEC, 20% H2O-80% H2/air) modes. At 850 and 700 °C, the peak power density is 1.23 and 0.48 ​W·cm−2 in SOFC mode, while the current density is 1.25 and 0.37 ​A·cm−2 at 1.3 V in SOEC mode, respectively. The performance degradation rates at 750 °C are 0.17 ​mV·h−1 in SOFC and 0.15 ​mV·h−1 in SOEC modes within 150 ​h, which are improved by Co doping.

Item ID: 79718
Item Type: Article (Research - C1)
ISSN: 2272-834X
Copyright Information: © 2023 Central South University. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Date Deposited: 15 Aug 2023 00:32
FoR Codes: 40 ENGINEERING > 4004 Chemical engineering > 400404 Electrochemical energy storage and conversion @ 100%
SEO Codes: 17 ENERGY > 1704 Energy transformation > 170404 Solid oxide fuel cells @ 100%
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