Effect of current switching on LSM-YSZ composite electrode durability

Kyle Yakal-Kremski, Gareth A. Hughes, Ann V. Call, Scott A. Barnett

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

A method for durability testing of solid oxide cell electrodes in current-switching operation is presented. The method provides both electrochemical and microstructural information by using multiple symmetrical cells connected in series. Electrochemical impedance spectroscopy measurements were done periodically during life tests of (La0.8Sr 0.2)0.98MnO3-Zr0.84Y 0.16O2 (LSM-YSZ) symmetrical cells at 800°C in air with a current of 0.5 or 1.5 Acm-2 switched every 30 minutes. By periodically removing cells from the circuit during the life test, microstructural changes due to current were observed at different stages. Focused Ion Beam-Scanning Electron Microscope (FIB-SEM) tomographic measurements of electrode microstructure were done on cells with different times at current. Silver, from current collectors used in the tests, was found to migrate into the electrodes near the YSZ electrolyte during fuel cell operation. The silver content increased with time at current and presumably explained the observed steady increase in polarization resistance.

Original languageEnglish (US)
Title of host publicationElectrochemical Synthesis of Fuels 1
Pages129-136
Number of pages8
Edition33
DOIs
StatePublished - 2012
Event1st International Symposium on Electrochemical Synthesis of Fuels, ESF 2011 - 220th ECS Meeting - Boston, MA, United States
Duration: Oct 9 2011Oct 14 2011

Publication series

NameECS Transactions
Number33
Volume41
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other1st International Symposium on Electrochemical Synthesis of Fuels, ESF 2011 - 220th ECS Meeting
Country/TerritoryUnited States
CityBoston, MA
Period10/9/1110/14/11

ASJC Scopus subject areas

  • Engineering(all)

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