Oxygen content exhaust gas sensor, and method of its...

G - Physics – 01 – N

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G01N 27/30 (2006.01) H01M 4/88 (2006.01) H01M 8/12 (2006.01)

Patent

CA 1139843

ABSTRACT OF THE DISCLOSURE. To improve operation and output voltage, particularly at 400°C and less, an oxygen sensor, especially adapted to determine oxygen content of automotive exhaust gases, is constructed by utilizing two electrodes applied on a body of stabilized zirconium dioxide, for example a closed tube, by making an electrode exposed to the exhaust gases in form of a mixture of finely dispersed ceramic material and a platinum-rhodium alloy, the ceramic material being present at about 40% (by volume) and 60% (by volume) platinum-rhodium alloy of 50-94% platinum and 50-6% rhodium (by weight). The second electrode, exposed to a reference gas comprises an alloy of palladium and another noble metal in a ratio of about 19-90% (by weight) Pd and 81-10% (by weight) noble metal. This electrode may also contain up to 40 (by volume) finely dispersed ceramic material. The electrode exposed to the exhaust gases is covered with a porous coating. The electrodes can be applied as aqueous or organic solutions of soluble noble metall compounds or suspensions, colloidal suspensions, with organic solvents, and the like, and subsequent sintering.

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