材料科学
电极
氧化物
电化学
阳极
纳米颗粒
电解
钨
化学工程
纳米技术
化学
冶金
电解质
工程类
物理化学
作者
Kun Zheng,Jakub Lach,Paweł Czaja,Michał Gogacz,Patryk Czach,Agnieszka Brzoza-Kos,Piotr Winiarz,Jie Luo
标识
DOI:10.1016/j.jpowsour.2023.233707
摘要
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 Sr2Fe2−xWxO6−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 Sr2Fe1.8W0.2O6−δ (Rp = 0.06 Ω cm2 at 800 °C stable for 100 h in air) and Sr2Fe1.6W0.4O6−δ (Rp = 0.56 Ω cm2 at 800 °C over 100 h in 5 vol% H2/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%Sr2Fe1.8W0.2O6−δ+20%GDC | LSGM | 80%Sr2Fe1.6W0.4O6−δ+20%GDC, demonstrating excellent power outputs (874 mW cm−2 at 850 °C in wet H2) 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 CH4 at 800 °C. The in situ exsolved metallic iron nanoparticles decorated on the Sr2Fe1.6W0.4O6−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.
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