Electrolyte-cathode assembly for a fuel cell
First Claim
1. An electrolyte-cathode assembly for a solid electrolyte fuel cell intended for operation at high temperature, which assembly comprises a solid ceramic electrolyte gas-tight body which is capable of conducting oxygen ions, and at least one layer of electron-conducting material in contact with the electrolyte and deposited on the surface thereof, wherein the layer of electron-conducting material is a compact layer having a thickness of at least 1 micron and at most 50 microns and consisting of a mixture containing from 20 to 80% by volume of indium oxide In2 O3 doped with tin oxide, the remainder being a ceramic material capable of conducting oxygen ions and electrons at the cell operating temperature and which is a mixed oxide solid solution crystallized in the cubic system, consisting essentially of (1) zirconium oxide ZrO2, (2) at least one oxide stabilizing the cubic phase of zirconium oxide and (3) uranium oxide UO2, the said layer being covered with a gas permeable surface layer having a thickness of at least 30 microns and at most 200 microns consisting essentially of indium oxide doped with tin oxide and having a dendritic structure.
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Abstract
An electrolyte cathode assembly for a solid electrolyte fuel cell intended for operation at high temperature comprises a solid ceramic electrolyte gas-tight body which is capable of conducting oxygen ions, the electrolyte having in contact with it and secured to its surface a layer of electron-conducting material which is a compact layer made up of a mixture of doped indium oxide In2 O3 and a ceramic material which is capable of conducting both oxygen ions and electrons at the cell operating temperature, the said layer being covered with a surface layer, which is permeable to gas, of doped indium oxide In2 O3 having a dendritic structure.
24 Citations
4 Claims
- 1. An electrolyte-cathode assembly for a solid electrolyte fuel cell intended for operation at high temperature, which assembly comprises a solid ceramic electrolyte gas-tight body which is capable of conducting oxygen ions, and at least one layer of electron-conducting material in contact with the electrolyte and deposited on the surface thereof, wherein the layer of electron-conducting material is a compact layer having a thickness of at least 1 micron and at most 50 microns and consisting of a mixture containing from 20 to 80% by volume of indium oxide In2 O3 doped with tin oxide, the remainder being a ceramic material capable of conducting oxygen ions and electrons at the cell operating temperature and which is a mixed oxide solid solution crystallized in the cubic system, consisting essentially of (1) zirconium oxide ZrO2, (2) at least one oxide stabilizing the cubic phase of zirconium oxide and (3) uranium oxide UO2, the said layer being covered with a gas permeable surface layer having a thickness of at least 30 microns and at most 200 microns consisting essentially of indium oxide doped with tin oxide and having a dendritic structure.
Specification