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Efficient strategy to boost the electrochemical performance of yttrium stabilized zirconia electrolyte solid oxide fuel cell for low-temperature applications.

Authors :
Nie, Jingjing
Zheng, Dan
Ganesh, K. Sivajee
Akbar, Muhammad
Chen Xia
Dong, Wenjing
Wang, Xunying
Wang, Hao
Wang, Baoyuan
Source :
Ceramics International. Feb2021, Vol. 47 Issue 3, p3462-3472. 11p.
Publication Year :
2021

Abstract

Yttrium stabilized zirconia (YSZ) used as the state-of-the-art electrolyte for solid oxide fuel cells (SOFCs) requires high temperature (over 800 °C) to realize sufficient oxygen ion conductivity. Thus, the high operational temperature is the main restriction for the commercial process of YSZ-based SOFCs. To obtain decent ionic conductivity at intermediate-low temperatures, Sr-free cathode LaNiO 3 is introduced into YSZ to construct a novel LaNiO 3 -YSZ composite electrolyte, which is sandwiched by two Ni 0.8 Co 0.15 Al 0.05 LiO 2-δ (NCAL) electrodes to assemble systematical fuel cells. This device presents an excellent peak output of 1045 mW cm-2 at 600 °C and even 399 mW cm-2 at 450 °C. A series of characterizations indicates that the oxygen ion conductivity of the LaNiO 3 -YSZ composite is significantly promoted in comparison with that of pure YSZ, and the LaNiO 3 component has certain proton conductivity after hydrogenation. Both of the two factors contributes to the superior performance of such devices at intermediate-low temperatures. Furthermore, the sharp decrease in electronic conductivity for LaNiO 3 in hydrogen atmosphere combined with Schottky junction at the anode-electrolyte interface eliminates the short-circuiting problem. Our work demonstrates that incorporating Sr-free cathode LaNiO 3 into the YSZ electrolyte is an efficient strategy to boost the performance and reduce the operational temperature of YSZ-based SOFCs. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02728842
Volume :
47
Issue :
3
Database :
Academic Search Index
Journal :
Ceramics International
Publication Type :
Academic Journal
Accession number :
147718040
Full Text :
https://doi.org/10.1016/j.ceramint.2020.09.190