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Immobilizing U cations in Sr2Fe2O6-δ as a new cathode for proton-conducting solid oxide fuel cells.

Authors :
Yu, Shoufu
Yang, Xuan
Wang, Yu
Bi, Lei
Source :
Ceramics International. Oct2022:Part A, Vol. 48 Issue 19, p28751-28758. 8p.
Publication Year :
2022

Abstract

U cations were immobilized in the traditional Sr 2 Fe 2 O 6-δ (SFO) oxide, which was subsequently evaluated as a cathode for proton-conducting solid oxide fuel cells (H–SOFCs). Experimental studies indicated that the U cations could be incorporated into the SFO lattice, forming the new Sr 2 Fe 1.5 U 0.5 O 6-δ (SFUO) oxide material. The SFUO material exhibited improved chemical stability than the SFO material, preventing the formation of carbonates after treatment in a CO 2 atmosphere. Although the total electrical conductivity was decreased with the U-doping, the surface catalytic activity of SFUO was improved compared with SFO, which was demonstrated by first-principles calculations. The subsequent electrochemical studies indicated that an H–SOFC using the SFUO cathode showed higher fuel cell output and smaller polarization resistance than the SFO cathode. The present study demonstrated that SFO could locate U cations in the lattice, and the produced SFUO oxide exhibited improved performance, suggesting the utilization of SFO cathode in the harsh environment (such as U-containing conditions) would be possible, and the electrochemical performance of the fuel cell is not reduced. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02728842
Volume :
48
Issue :
19
Database :
Academic Search Index
Journal :
Ceramics International
Publication Type :
Academic Journal
Accession number :
158390718
Full Text :
https://doi.org/10.1016/j.ceramint.2022.06.219