Simwonis, D. (Corresponding author)

1999
Forschungszentrum, Zentralbibliothek Jülich

Report No.: Juel-3678

Abstract: Solid oxide fuel cells (SOFCs) are electrochemical devices which directly convert the chemical energy of a fuel into electricity. At the Research Centre JOlich, the planar substrate concept has been developed, in which the anode, which is a cermet of nickel and yttria-stabilized zirconia, consists of a supporting, porous anode substrate and a thin finely structured coating. The anode substrate currently used has been studied in detail using various methods of characterization, and its properties and microstructural features were determined for further optimization experiments. Various low-cost starting materials and different processing techniques were used for substrate production. These substrates were evaluated on the basis of their properties and microstructure with a view to application in solid oxide fuel cells. A series of microstructural tests have been carried out on anode substrates and anode layers with respect to their long-term stability. Ageing of the anodes due to Ni agglomeration was described quantitatively and in terms of a model. Low Ni agglomeration was observed whenever both Ni as well as YSZ and pores were as finely distributed as possible

Keyword(s): solid oxide fuel cell ( SOFC ) ; anode

1. Werkstoffsynthese und Herstellungsverfahren (IEF-1)