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- Brandner, Marco, 1900, et al.
(författare)
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High temperature fuel cell, which is an electrochemical energy converter, comprises a ferritic component and a nickel component and an intermediate barrier layer, which consists of e.g. cerium oxide
- 2006
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The barrier layer consists of cerium dioxide. The barrier layer is endowed with yttrium, gadolinium, niobium or samarium. The barrier layer covers at least on one side of the ferritic component, as thin, preferably thick film. The barrier layer is not thicker than 10 mu m, preferably thinner than 2 mu m. The ferritic component is a porous metallic substrate and the nickel component is an anode. The ferritic component is an inter-connector and the nickel component is a nickel network. The barrier layer consists of: (calcium, strontium, barium)1-3x/2 (yttrium, lanthanide (ln))x titanium oxide (where Xy is 0-0.1 and/or Xln is 0-0.67); chromium oxide and/or chromium(II, III) oxide, manganese(II, III) oxide; iron(II) oxide and/or iron(II, III) oxide; cerium1-x-y (yttrium, lanthanide)x (titanium, niobium)yO2 (where x is 0-0.5 and y is 0-0.2); lanthanide1-x(strontium, calcium)x (magnesium oxide (mgO3)) aluminum oxide (AlO3), chromium oxide (CrO3) (where x is 0.1-0.5).
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- Froitzheim, Jan, 1981, et al.
(författare)
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Anode Side Diffusion Barrier Coating for Solid Oxide Fuel Cells Interconnects
- 2010
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Ingår i: Journal of Fuel Cell Science and Technology. - : ASME International. - 1550-624X .- 1551-6989. ; 7:3
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Tidskriftsartikel (refereegranskat)abstract
- During the operation of solid oxide fuel cells (SOFCs) the Ni base anode and/or Ni-mesh is in direct contact with the ferritic steel interconnect or the metallic substrate. For assuring long-term stack operation a diffusion barrier layer with high electronic conductivity may be needed to impede interdiffusion between the various components. A pre-oxidation layer on the ferritic steel turned out to be not viable as a barrier layer since a Ni-layer tends to dissociate the oxide scale. Therefore the potential of ceria as a diffusion barrier layer for the anode side of the SOFC was estimated. The barrier properties of a ceria coating between the Ni and the ferritic steel Crofer 22 APU were tested for 1000 h in Ar–4H2–2H2O at 800°C. Conductivity experiments were performed in the same atmosphere at different temperatures. After long-term exposures no indication of interdiffusion between Ni and ferritic steel could be detected, however, sputtered coatings on ferritic steel substrates showed significantly lower conductivities than bulk ceria samples because of void formation between the ceria and the oxide on the steel surface. The latter could be prevented by an intermediate copper layer, which resulted in overall area specific resistance values lower than 20 mΩ cm2 after 100 h exposure at 800°C.
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