Stability of nickel-infiltrated anodes in intermediate temperature SOFCs

E. C. Miller, Q. Sherman, Z. Gao, Peter W Voorhees, Scott A Barnett

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

14 Scopus citations

Abstract

Nickel-infiltrated La1-xSrxGa0.8Mg0.2O3-δ (LSGM) anode functional layers have been shown to yield low polarization resistance in intermediate-temperature solid oxide fuel cells (IT-SOFCs) with thin LSGM electrolytes. A dehydration step after nickel nitrate infiltration and a decrease in the calcination temperature were both shown to decrease the initial NiO particle size, but other factors such as geometry and Ni loading affected the Ni particle size upon reduction. The infiltrated anode polarization resistance, measured during life tests of full cells by separating out the anode component using electrochemical impedance spectroscopy and equivalent circuit fitting, increased continuously, e.g. from 0.08 to 0.16 Ω cm2, after 550 h at 650°C. This change was accompanied by approximately a factor of 2 increase in the feature size of the infiltrated Ni. A simple electrochemical model is presented that predicts the observed changes in polarization resistance based on the effect of particle coarsening on triple-phase boundary density.

Original languageEnglish (US)
Title of host publicationSolid Oxide Fuel Cells 14, SOFC 2015
EditorsK. Eguchi, S. C. Singhal
PublisherElectrochemical Society Inc.
Pages1245-1254
Number of pages10
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

Publication series

NameECS Transactions
Number1
Volume68
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

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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