Oxygen sensor coated with catalytic material
First Claim
1. An oxygen sensor to sense the difference in oxygen content between two gases, comprising a layer of a solid oxygen-ion electrolyte, a first metal electrode formed on a side of said electrolyte layer to communicate with a reference gas, a second metal electrode formed on the opposite side of said electrolyte layer to communicate with the gas being measured, both said first and second electrodes being permeable to gas, and a porous coating formed on said second electrode, said coating being of an inorganic material comprising at least a major amount of at least one refractory oxide and impregnated with a catalyst for oxidation of oxidizable components in said gas said refractory oxide comprises at least a substantial amount of Al2 O3.
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Abstract
One of the Pt electrodes of a concentration cell comprising a solid oxygen-ion electrolyte is coated with a porous inorganic material such as γ-type Al2 O3 impregnated with an oxidation catalyst such as Pt so that oxidation reactions in a mixed gas to be measured may attain equilibrium before the gas comes into contact with the cell.
43 Citations
9 Claims
- 1. An oxygen sensor to sense the difference in oxygen content between two gases, comprising a layer of a solid oxygen-ion electrolyte, a first metal electrode formed on a side of said electrolyte layer to communicate with a reference gas, a second metal electrode formed on the opposite side of said electrolyte layer to communicate with the gas being measured, both said first and second electrodes being permeable to gas, and a porous coating formed on said second electrode, said coating being of an inorganic material comprising at least a major amount of at least one refractory oxide and impregnated with a catalyst for oxidation of oxidizable components in said gas said refractory oxide comprises at least a substantial amount of Al2 O3.
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9. An oxygen sensor comprising a tubular body made of a solid solution of ZrO2 and CaO, an end thereof being sealed, a first Pt electrode formed on the inner surface of said body, a second Pt electrode formed on at least a portion of the outer surface of said body including the sealed end, both said first and second electrodes being permeable to gas, and a coating of porous γ
- -type Al2 O3 formed on the surface of said second electrode, said coating being impregnated with Pt.
Specification
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- Resources
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Current AssigneeNissan Motor Co., Ltd.
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Original AssigneeNissan Motor Co., Ltd.
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InventorsTakao, Hiroshi, Matoba, Kazuo, Hata, Yoshitaka, Togawa, Kinmochi
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Primary Examiner(s)Kaplan, G. L.
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Application NumberUS05/489,539Time in Patent Office558 DaysField of Search204/195 S, 204/1 T, 324/29, 136/86 FUS Class Current204/429CPC Class CodesG01N 27/4075 Composition or fabrication ...
