Electrochemical performance of solid oxide cell oxygen electrodes under pressurization

Gareth A. Hughes, Justin Railsback, Danielle M. Butts, Scott A Barnett

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

6 Scopus citations

Abstract

The solid oxide cell (SOC) composite oxygen electrodes (La0.8Sr0.2)0.98MnO3-δ - Zr0.84Y0.16O2-γ (LSM-YSZ) and La0.6Sr0.4Fe0.8Co0.2O3-δ (LSCF) - Ce0.8Gd0.2O1.95 (LSCF-GDC) were studied at oxygen partial pressure pO2 from 0.1 to 10 atm by impedance spectroscopy. Both electrodes showed a main response at frequency < 100 Hz that decreased in size and frequency with increasing pO2, and a smaller response at ∼ 103 Hz. The impedance spectra were fit using an equivalent circuit model with two RQ elements. Total electrode resistances decreased with increasing pO2 following a pO2-0.17 dependence for LSM-YSZ and a pO2-0.20 dependence for LSCF-GDC. Overall, the area-specific resistance of these oxygen electrodes is reduced by a factor of ∼2 by increasing oxygen pressure from a nominal 0.2 atm (air) to 10 atm, thereby improving SOC performance.

Original languageEnglish (US)
Title of host publicationSolid Oxide Fuel Cells 14, SOFC 2015
EditorsK. Eguchi, S. C. Singhal
PublisherElectrochemical Society Inc.
Pages687-697
Number of pages11
Volume68
Edition1
ISBN (Electronic)9781607685395
DOIs
StatePublished - Jan 1 2015
Event14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015; held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage - Glasgow, United Kingdom
Duration: Jul 26 2015Jul 31 2015

Other

Other14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015; held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage
CountryUnited Kingdom
CityGlasgow
Period7/26/157/31/15

ASJC Scopus subject areas

  • Engineering(all)

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