Sensor element and gas sensor
A sensor element and gas technology, applied in the direction of engine components, chemical instruments and methods, instruments, etc., can solve problems such as difficult to control precise combustion, achieve the effect of improving detection accuracy and suppressing the reduction of responsiveness
Active Publication Date: 2020-08-04
NGK SPARK PLUG CO LTD
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Problems solved by technology
In this way, the arriving hydrogen reacts with the detection electrode, and the detection electrode misjudgments, and the λ point that should be detected is deviated. Therefore, it may become difficult to control precise combustion.
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[0045] After granulating YSZ with 5 mol% yttrium oxide added to zirconia, it is fired to produce figure 1 The solid electrolyte body 3s shown. Next, the outer electrode 55 was provided on the outer peripheral surface of the solid electrolyte body 3 s by electroless Pt plating. Next, spinel is plasma sprayed on the surface of the outer electrode 55 to form a porous gas confinement layer 57 . Then, the inner electrode 51 is provided on the inner surface of the solid electrolyte body 3 s by electroless Pt plating. Furthermore, the slurry of the unbaked catalyst layer 60 is coated on the surface of the gas confinement layer 57 . The slurry contains: 63 wt% of spinel particles with an average particle diameter of 30-40 μm, 8 wt% of glass powder, and 29 wt% of fine particles with an average particle diameter of 0.3 μm or less. TiO 2 , alumina, ZrO 2 , any one of YSZ. Next, heat-treat the solid electrolyte body 3s as a whole in a reducing atmosphere, then impregnate the carrie...
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Abstract
Provided are: a sensor element which suppresses decrease in the responsiveness of a gas sensor, while improving the detection accuracy of a gas to be detected by means of a catalyst; and a gas sensor.The sensor element (3) is provided with: an oxygen ion conductive solid electrolyte body (3s); a detection electrode (55) which is provided on one surface of the solid electrolyte body and comes intocontact with a gas to be measured; and a reference electrode (51) which is provided on the other surface of the solid electrolyte body and comes into contact with a reference gas. This sensor element(3) is additionally provided with a catalyst layer (60) which covers the detection electrode and which comprises: a porous carrier (63); and one or more catalysts (65) which are supported by the carrier and are selected from the group consisting of Ru, Rh, Pd, Ir and Pt. The carrier is mainly composed of a combined body of ceramic particles (61) and Ti oxide particles (62) that are different fromthe ceramic particles and have a smaller particle diameter than the ceramic particles.
Description
technical field [0001] The present invention relates to a sensor element and a gas sensor for detecting the concentration of a target gas. Background technique [0002] As a gas sensor for detecting the oxygen concentration in exhaust gas of an automobile or the like, a gas sensor including a sensor element in which a detection electrode and a reference electrode are provided on the surface of a cylindrical or plate-shaped solid electrolyte is known. Alternatively, a porous electrode protection layer for preventing poisoning of the detection electrode is formed on the surface of the detection electrode. However, in recent years, there has been a demand for a gas sensor that is effective in strengthening exhaust gas regulation and that can realize more precise combustion control of an internal combustion engine. As a gas sensor suitable for this purpose, a gas sensor capable of measuring the oxygen concentration with little deviation of the lambda point is required. However...
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IPC IPC(8): G01N27/409
CPCB01J23/42G01N27/4075B01J23/40F01N2560/025G01N27/4077G01N27/409G01N33/0036
Inventor 伊藤和真
Owner NGK SPARK PLUG CO LTD