Abstract
La1-x-ySrxAgyMnO3-δ was synthesized via modified Pechini method. Silver (Ag) was incorporated into La1-x-ySrxAgyMnO3-δ cathode material for solid oxide fuel cells as a catalyst precursor for oxygen reduction reaction. The La1-x-ySrxAgyMnO3-δ
perovskite single phase formed at 800°C, and the solubility of Ag in
the crystal lattice of the perovskite was up to 5 mol%.
The single-phase materials revealed thermal
stability in different oxidizing atmospheres up to sintering temperature
of the
cathode at 1050°C. The exsolution of the metallic
Ag nanoparticles was performed at 350–600°C in reducing atmosphere.
Scanning
electron and scanning transmission electron
microcopy revealed a good mechanical contact of the Ag nanoparticles to
the surface
of the perovskite after reducing conditions. The
electrochemical tests of the materials showed a good electrocatalytic
effect
of nanosized Ag toward oxygen reduction reaction.
The electrochemical performance of the cathodes revealed the dependence
on electrolyte material and exsolution time.
Original language | English |
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Journal | Journal of The Electrochemical Society |
Volume | 166 |
Issue number | 2 |
Pages (from-to) | F79-F88 |
ISSN | 0013-4651 |
DOIs | |
Publication status | Published - 2019 |