期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 926, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2022.166852
关键词
Solid oxide fuel cells; Synergistic effect; Copper -iron bimetallic nanoparticles; Exsolution
资金
- National Natural Science Foundation of China [51872067, 21773048]
- National Key R & D Program of China [2018YFB1502200]
A promising anode material decorated with copper-iron bimetallic nanoparticles was prepared by in-situ exsolution, providing abundant active sites for fuel oxidation and leading to improved polarization resistance and maximum power density in solid oxide fuel cells.
The design of active anode materials with abundant active sites for fuel oxidation reaction is highly de-sirable. In-situ exsolution of nanoparticles from perovskite oxides is an effective approach to maintain its nanoscale dimensions and provide efficient active sites. Herein, a promising anode material decorated with copper-iron bimetallic nanoparticles is prepared by in-situ exsolution from A-site deficient Sr1.9Fe1.5Mo0.5-xCuxO6-delta double perovskite. With the doping of Cu, the agglomeration of iron nanoparticles is highly inhibited under reducing environment and copper-iron bimetallic nanoparticles can be uniformly formed. Through high temperature reduction, Sr1.9Fe1.5Mo0.5O6-delta substrate is transferred to heterostructure consisting of a Ruddlesden-Popper phase (Sr3FeMoO6.5) and a perovskite phase. The in-situ exsolved copper-iron bimetallic nanoparticles on the heterostructure can provide abundant active sites for fuel oxidation and lead to an improvement of polarization resistance from 0.41 & UOmega;middotcm2 to 0.22 & UOmega;middotcm2 at 800 & DEG;C under H2. In addition, the maximum power density is increased to 574 mW cm-2, which is about 37% higher than that of Sr1.9Fe1.5Mo0.5O6-delta. The present study provides a potential strategy for developing efficient anode materials for solid oxide fuel cells.(c) 2022 Published by Elsevier B.V.
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