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