Failure analysis of solid oxide fuel cells nickel-yttria stabilized zirconia anode under siloxane contamination

Jiashen Tian, Ryan J. Milcarek

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, the failure process of the solid oxide fuel cell (SOFC) Ni-yttria-stabilized zirconia (YSZ) anode is investigated with D4 siloxane (octamethylcyclotetrasiloxane) contamination. In order to evaluate the influence of the electrochemical reaction on the siloxane deposition process, the SOFC experiments were operated at open circuit voltage (OCV) and 50 mA cm−2 conditions at 800 °C. During the failure process, electrochemical, morphology and exhaust gas component analysis testing are conducted at the critical points. An equivalent circuit model and corresponding microstructure parameter calculations for separated physicochemical processes were utilized for the quantitative analysis of the failure process. The results confirm the siloxane chemical adsorption deposition mechanism proposed in previous work. As a result, the failure of the anode was attributed to the gas diffusion blockage by dense silicon dioxide layer formation. The anode failure process with siloxane contamination is faster when the anode is operated under polarization.

Original languageEnglish (US)
Article number140922
JournalElectrochimica Acta
Volume428
DOIs
StatePublished - Oct 1 2022
Externally publishedYes

Keywords

  • Anode microstructure quantification
  • Degradation
  • Equivalent circuit model (ECM)
  • Failure
  • Siloxane
  • Solid oxide fuel cell (SOFC)

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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