Electrochemical sensor for oxygen concentration determination in

Details Electrochemical sensor for oxygen concentration determination in Electrochemical sensor for oxygen concentration determination in

1980-03-14

1981-07-28

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

427123, 427125, 427426, B05D 134, G01N 2758

Patent

active

042808901

ABSTRACT:
To decrease the quantity of catalytically active noble metal used in a Cermet (ceramic-metal) electrode, particularly one containing platinum, the electrode has a non-uniform noble metal concentration, with respect to its cross section, so that the outer region thereof consists essentially only of ceramic material, protecting the softer noble metal which is subject to erosion, and permitting a higher concentration of noble metal close to the solid electrolyte body where it is most needed. This type of electrode can be applied, for example, by concurrent spraying of an aqueous suspension of noble metal-and-ceramic from one nozzle, and a suspension of only ceramic from another nozzle, and varying the throughput through the two nozzles, first only spraying the metal-ceramic mixture and then starting the ceramic-only suspension while decreasing the mixture suspension until only ceramic material is sprayed; in accordance with another method, the solid electrolyte body can, for example, be dipped in sequential suspensions or have sequential suspensions applied thereto by dripping-on, painting-on, or the like. The electrode and the solid electrolyte body, for example zirconium dioxide, are then sintered.

REFERENCES:
patent: 3843400 (1974-10-01), Radford et al.
patent: 3978006 (1976-08-01), Topp et al.
patent: 4021326 (1977-05-01), Pollner et al.
patent: 4080276 (1978-03-01), Bode
patent: 4097353 (1978-06-01), Kishida et al.
patent: 4170530 (1979-10-01), Watanabe et al.

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