Browsing by Subject "Nanoparticles"

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Access status: Open Access ,
Designing high-performance quasi-symmetrical solid oxide cells with a facile chemical modification strategy for Sr2Fe2-xWxO6-δ ferrites electrodes with in situ exsolution of nanoparticles
(2023) Zheng, Kun; Lach, Jakub; Czaja, Paweł; Gogacz, Michał; Czach, Patryk; Brzoza-Kos, Agnieszka; Winiarz, Piotr; Luo, Jie
Wydział Energetyki i Paliw
The chemical modification of perovskites is one of the most effective design strategies for electrode materials for solid oxide cells. In this work, the tungsten doping in $Sr_{2}Fe_{2−x}W_{x}O_{6−δ}$ shows a significant impact on their physicochemical properties, and it leads to a substantial change of electrochemical properties in the air and reducing conditions, with $Sr_{2}Fe_{1.8}W_{0.2}O_{6−δ}$ (Rp = 0.06 Ω cm2 at 800 °C stable for 100 h in air) and $Sr_{2}Fe_{1.6}W_{0.4}O_{6−δ}$ (Rp = 0.56 Ω cm2 at 800 °C over 100 h in 5 vol% $H_{2}/Ar$) being the best air and fuel electrode candidates, respectively. We have proposed an attractive design of high-performance quasi-symmetrical solid oxide cells with $80%Sr_{2}Fe_{1.8}W_{0.2}O_{6−δ}+20%GDC$ | LSGM | $80%Sr_{2}Fe_{1.6}W_{0.4}O_{6−δ}+20%GDC$, demonstrating excellent power outputs ($874 mW cm^{−2}$ at 850 °C in wet $H_{2}$) and good current density of 743 mA $cm^{−2}$ at 1.5 V in electrolysis mode at 750 °C. A good performance of 451 mW $cm^{−2}$ was also recorded in wet $CH_{4}$ at 800 °C. The in situ exsolved metallic iron nanoparticles decorated on the $Sr_{2}Fe_{1.6}W_{0.4}O_{6−δ}$ anode contribute to the excellent electrochemical performance of cells. This study provides a successful scenario for designing high-performance symmetrical solid oxide cells with a facile chemical modification strategy for ferrites electrodes with in situ exsolution of nanoparticles.