Porous Ni/TiO2 substrates for planar solid oxide fuel cell applications

Anode substrates based on Ni/TiO₂ cermets were fabricated for planar solid oxide fuel cells (SOFCs) with the aim of reducing the material costs and preventing thermoelastic bending of the currently used Ni/8YSZ-based cells. Ni/TiO₂ substrates were produced via sintering of NiO/NiTiO₃ powder compacts...

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Bibliographic Details
Published in:Journal of materials science 2001-12, Vol.36 (23), p.5719-5728
Main Authors: Meschke, F, Dias, F. J, Tietz, F
Format: Article
Language:English
Subjects:
air
Anodes
Anodic coatings
Applied sciences
Bending
cells
Ceramics industry
Cermets
electrical conductivity
Electrical resistivity
electrodes
Electrolytes
Electrolytic cells
Energy
Energy. Thermal use of fuels
Exact sciences and technology
fuel cells
Materials and auxiliary equipments used in energy engineering
Materials science
Metals. Metallurgy
Microstructure
Permeability
Powder compacts
Reduction
Schedules
Sintering
Sintering (powder metallurgy)
Solid oxide fuel cells
Substrates
Thermal expansion
Titanium dioxide
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Summary:Anode substrates based on Ni/TiO₂ cermets were fabricated for planar solid oxide fuel cells (SOFCs) with the aim of reducing the material costs and preventing thermoelastic bending of the currently used Ni/8YSZ-based cells. Ni/TiO₂ substrates were produced via sintering of NiO/NiTiO₃ powder compacts and subsequent reduction. The sintering behavior in air and the resulting microstructure were studied in detail. Excellent electrical conductivity and gas permeability was achieved before and after reduction due to coarse microstructure. The co-firing behavior of substrates coated with an anode layer and an 8YSZ electrolyte membrane was analyzed with the aim of identifying those sintering schedules which give flat cells with a gastight electrolyte. Thermoelastic bending of cells is negligible since the thermal expansion coefficient is well adjusted to the 8YSZ electrolyte.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1012594406053