Fuel cell comprising a solid electrolyte layer

Details Fuel cell comprising a solid electrolyte layer Fuel cell comprising a solid electrolyte layer

2005-07-12

2005-07-12

Kalafut, Stephen J. (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S006000, C429S006000

Reexamination Certificate

active

06916569

ABSTRACT:
A fuel cell having a solid electrolyte layer (12) forms together with two electrode layers (11, 13) a plate-like multiple layer system (1). The layers are applied by means of coating procedures to an open-pored, electrically conducting carrier structure (10) in the sequence anode (11), electrolyte (12) and cathode (13). This multiple layer system (1) has an outer edge which is exposed during a current generating operation of the fuel cell to an external environment (60) which contains molecular oxygen. The material of the carrier structure assumes an oxidized or a reduced state in thermodynamic equilibrium at the operating temperature of the fuel cell depending on the environment. The outer edge (16) of the multiple layer plate is covered over with an inert material. At the operating temperature of the fuel cell this edge covering (126) forms a barrier which inhibits or prevents the transport of molecular oxygen out of the external environment (60) into the carrier structure. The material is in particular YSZ, i.e. zirconium dioxide ZrO2which is stabilized with yttrium oxide Y2O3.

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M. Dokiya, et al. “Wet Process for Planar SOFC”Proceedings of the International Symposium on Solid Oxide Fuel Cells, Lu, Luxemburg, EEC, vol. Symp.2, Jul. 2, 1991, pp. 127-134.

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