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| Hauptseite > Publikationsdatenbank > Alternative Methoden zur Herstellung von Anoden der Hochtemperatur-Brennstoffzelle |
| Book/Report | FZJ-2019-01801 |
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1997
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/21821
Report No.: Juel-3344
Abstract: The Industry of the high developed countries strives for the commercialisation of Solid Oxide Fuel Cell (SOFC). The high operation temperatures around 950 °C posesevere requirements on SOFC materials. The Ni/8YSZ cermet has been established as an anode material world-wide. The metallic nickel forms a continuous network which provides the necessary electrical conductivity of the anode. The agglomeration of nickel which may occur during service interrupts the continuity of the Ni network. This leads to a decrease in the conductivity and in the long-time stability of the anode. Efforts to reduce the agglomeration phenomenon are being undertaken. The aim of this work was to minimise the tendency of the agglomeration by two means: => modification of the microstructure morphology. By modification of the morphology, agglomeration could be prevented. => modification of the interfacial properties to improve the wetting properties. Several powders were treated and produced using three different procedures. 1. 8YSZ particles were coated with nickel by means of electroless plating. 2. Powders were produced by means of a sol-gel method, to give a fine intermixture of NiO and 8YSZ. 3. Four types of 8YSZ powder were produced using a spray drying procedure. Three of these were doped with Mn, Cr, or Ti oxide. The Ni/8YSZ interface properties should be modified by the additions. Specimens of the cermets were made by uniaxial pressing and the long-time stability with respect to the conductivity was investigated. It was found that the first of the above methods of powder production yielded better results than the conventional methods. It was observed that the electrical conductivity and the long-time stability cermets produced by the sol-gel process increases, if the powder grain size finer. The first results of the electrochemical activity measurements were above averaged values. The results obtained for the doped powders showed that there was a strong influence of the metal oxide additions on the sinter activity and thus on the porosity. However the direct influence of the additions on the specific electrical conductivity and on the long-time stability was masked.
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