Oxygen concentration sensor

Details Oxygen concentration sensor Oxygen concentration sensor

1994-01-21

1995-06-06

Gorgos, Kathryn

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204424, G01N 2726

Patent

active

054219841

ABSTRACT:
This invention aims at providing an oxygen concentration sensor having electrodes which are excellent in heat resistance and durability and maintain quick response. An electrode 26 on an exhaust side is formed on one of the side surfaces of a solid electrolyte 25, and an electrode 24 on an atmosphere side is formed on the other side surface. The electrode 26 on the exhaust side has a composite structure comprising a skeletal electrode 26a and a reaction electrode 26a. The skeletal electrode 26a has a film thickness of 5 to 20 .mu.m and a porosity of less than 10%, and is a heat-resistant thick film for primarily forming a skeletal region. In contrast, the reaction electrode 26b has a film thickness of 0.5 to 2 .mu.m and a porosity of 10 to 50%, and is a high response thin film for primarily forming a reaction region.

REFERENCES:
patent: 4121988 (1978-10-01), Sano
patent: 4220516 (1980-09-01), Sano et al.

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