Interfacial properties and structure stability of Ni/Y sub(2) O sub(3)-ZrO sub(2)-TiO sub(2) cermet anodes for solid oxide fuel cells

Ceramics of the ternary system Y sub(2)O sub(3)-ZrO sub(2)-TiO sub(2) (YZT) and Ni/YZT cermets are evaluated in terms of application as anode electrodes in a Solid Oxide Fuel Cell. Wetting experiments in liquid Ni/YZT systems show that the increase of TiO sub(2) content in the ceramic phase improves...

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Bibliographic Details
Published in:Journal of materials science 2005-05, Vol.40 (9-10), p.2471-2475
Main Authors: Mantzouris, X, Zouvelou, N, Skarmoutsos, D, Nikolopoulos, P, Tietz, F
Format: Article
Language:English
Subjects:
Anodes
Ceramics
Cermets
Interfacial properties
Nickel
Solid oxide fuel cells
Stability
Titanium dioxide
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Summary:Ceramics of the ternary system Y sub(2)O sub(3)-ZrO sub(2)-TiO sub(2) (YZT) and Ni/YZT cermets are evaluated in terms of application as anode electrodes in a Solid Oxide Fuel Cell. Wetting experiments in liquid Ni/YZT systems show that the increase of TiO sub(2) content in the ceramic phase improves the bond strength at the metal ceramic interface, due to the reduction of the interfacial energy. Ni(40 vol%)/YZT cermets are exposed at 1000C for up to 1000 h in reducing atmosphere and exhibit an improved long term stability regarding to the electrical conductivity and the microstructure compared to the 'state of the art' Ni/8YSZ (yttria(8 mol%)-stabilized zirconia) cermet. This is explained by the enhanced adherence at the Ni/ceramic interface, which suppresses the agglomeration rate of the Ni particles. The improvement of the interfacial properties diminishes the TEC values of the Ni/YZT cermets constraining the thermal expansion mismatch between the cermet anode and the 8YSZ electrolyte in the SOFCs.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-005-1977-9