Silver Modified Cathodes for Solid Oxide Fuel Cells

Rokas Sažinas*, Kjeld Bøhm Andersen, Søren Bredmose Simonsen, Peter Holtappels, Kent Kammer Hansen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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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 languageEnglish
JournalJournal of The Electrochemical Society
Volume166
Issue number2
Pages (from-to)F79-F88
ISSN0013-4651
DOIs
Publication statusPublished - 2019

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