Gas component sensor for gas sulfur oxides
First Claim
1. A gas sensor for oxides of sulfur assembly comprising:
- (a) an electrolyte comprising electrochemically effective concentrations of;
(i) one or more alkali metal sulfates;
(ii) one or more alkaline earth metal sulfates; and
(iii) one or more reference electrode metal halogens wherein the reference electrode metal of the reference electrode metal halogens is chosen from the group consisting of ruthenium, rhodium, palladium, rhenium, osmium, iridium, platinum and gold and the halogens of the reference metal halogens are chlorine, bromine or iodine;
(b) the electrolyte in electrochemical connection between a sensing electrode and a reference electrode, whereby the reference electrode consists of a first reference electrode metal and the sensing electrode consists of any other reference electrode metal; and
(c) the electrolyte and electrodes are supported on a substrate.
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Abstract
The present invention is a gas component sensor comprising novel electrolyte compositions. The electrolyte compositions in bulk, sintered or thin film embodiments are capable of forming with different-metal sensing and reference electrodes a highly stable gas oxide sensors. The novel electrolyte composition changes electrochemical reactions at the sensing and reference electrodes and the overall reaction of the electrodes and electrolyte. The novel electrolyte compositions have: (1) excellent chemical stability and thermal compatibility as to the electrodes and a preferred ceramic substrate, (2) excellent chemical stability with the environment as to the reference and sensing electrodes, which need not be sealed against the atmosphere to be sensed, (3) effective adherence to the substrate and electrode metals.
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10 Claims
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1. A gas sensor for oxides of sulfur assembly comprising:
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(a) an electrolyte comprising electrochemically effective concentrations of;
(i) one or more alkali metal sulfates;
(ii) one or more alkaline earth metal sulfates; and
(iii) one or more reference electrode metal halogens wherein the reference electrode metal of the reference electrode metal halogens is chosen from the group consisting of ruthenium, rhodium, palladium, rhenium, osmium, iridium, platinum and gold and the halogens of the reference metal halogens are chlorine, bromine or iodine;
(b) the electrolyte in electrochemical connection between a sensing electrode and a reference electrode, whereby the reference electrode consists of a first reference electrode metal and the sensing electrode consists of any other reference electrode metal; and
(c) the electrolyte and electrodes are supported on a substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification