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

Journal Article · · Electrochimica Acta
 [1];  [2]
  1. Arizona State Univ., Tempe, AZ (United States); OSTI
  2. Arizona State Univ., Tempe, AZ (United States)

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. Further, 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.

Research Organization:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Organization:
USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0007721
OSTI ID:
2418531
Journal Information:
Electrochimica Acta, Journal Name: Electrochimica Acta Journal Issue: C Vol. 428; ISSN 0013-4686
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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