H - Electricity – 01 – M
Patent
H - Electricity
01
M
319/21, 324/25
H01M 8/12 (2006.01)
Patent
CA 1096441
ELECTROCHEMICAL CELL HAVING ENHANCED- SURFACE NON-CONDUCTING SOLID ELECTROLYTE AND METHOD OF MAKING SAME ABSTRACT A layer of porous ion-conducting solid electrolyte material is applied to a dense substrate of the same material and then coated with a catalytic electrode to provide additional surface area in ionic continuity with the conduction paths for ion transport in the bulk lattice. For a yttria stabilized zirconia electrolyte, the enhanced surface area results in an oxygen sensing cell of a particular dimension having a much lower output impedance than a similarly dimensioned cell having only a dense electrolyte. Furthermore, the improved cell can operate at much lower temperatures than prior art cells. The catalytically coated porous high surface area electrolyte coating provides, in an automotive oxygen sensor, a dual function. Firstly, it provides a catalyst support in its outer extremities to provide thermodynamic equilibrium to the exhaust gases. Secondly, it provides reactivity deep in the matrix of the coating between oxygen ions and the thermodynamically equilibrated gases. Further, a method is disclosed for lowering the output impedance of an electrochemical cell having a dense substrate of an ion-conducting solid electrolyte which is of a predetermined thickness. The invention would also be useful for fuel cells.
293041
Macrae & Co.
Uop Inc.
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