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Optimization of Redox Stable Ni-YSZ Anodes for SOFCs by Two-step Infiltration
Journal of The Electrochemical Society
  • Aligul Buyukaksoy
  • Vladimir Petrovsky
  • Fatih Dogan, Missouri University of Science and Technology
Abstract

Infiltration of a polymeric nickel oxide precursor into a sintered porous ytrria -stabilized zirconia (YSZ) skeleton is a promising approach to achieve redox stable solid oxide fuel cells. In order to ensure that the porous YSZ skeleton was mechanically strong enough to withstand the stresses caused by the volumetric expansion of the Ni phase upon oxidation even at relatively high loadings, a polymeric YSZ precursor was infiltrated into to the porous YSZ skeleton, prior to NiO infiltration. It was shown that infiltration of YSZ precursor strengthened the porous YSZ skeleton without compromising from the porosity or initial YSZ particle size significantly. The amount of infiltrated YSZ and the subsequent heat-treatment temperature were determined to be important processing parameters in achieving redox stable Ni-YSZ anodes. Electrolyte supported SOFC (electrolyte thickness ∼ 180 μm) with redox stable anode prepared by YSZ and NiO infiltrations showed a power density of ∼0.41 Watt/cm2 at 800°C which did not change significantly after 20 redox cycles in 10%H2 - 90% Ar fuel. Impedance spectroscopy measurements at 800°C showed significantly low electrode polarization resistances (anode + cathode ∼ 0.07 Ohm.cm2 at 800°C) which remained stable upon redox cycling.

Department(s)
Materials Science and Engineering
Keywords and Phrases
  • Fuel Cells,
  • Electolyzers,
  • Energy Conversion
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2012 The Electrochemical Society (ECS), All rights reserved.
Publication Date
10-1-2012
Publication Date
01 Oct 2012
Citation Information
Aligul Buyukaksoy, Vladimir Petrovsky and Fatih Dogan. "Optimization of Redox Stable Ni-YSZ Anodes for SOFCs by Two-step Infiltration" Journal of The Electrochemical Society (2012) ISSN: 0013-4651
Available at: http://works.bepress.com/fatih-dogan/144/