All-solid mixed-potential NOx sensor and preparation method thereof

Abstract

The invention discloses an all-solid mixed-potential NOx sensor prepared on the basis of spark plasma sintering technology. The NOx sensor consists of an electrolyte layer, a sensing electrode layer, a reference electrode and a working electrode, wherein the multilayer composite consisting of the electrolyte layer and the sensing electrode layer is directly sintered by the spark plasma sintering technology; and the reference electrode layer and the working electrode layer, which have screen pores, are directly printed in the centers of the upper and lower surfaces of the composite by screen printing. As the NOx sensor is manufactured by the spark plasma sintering technology, the sensing electrode layer and the electrolyte layer of the sensor are well combined without problems of flying up, cracking and the like and have the characteristics of good repeatability, stable performance, simple manufacturing process, short manufacturing period, small volume, quick response and the like. The NOx sensor of the invention can detect NOx concentration ranging from 1 to 75 percent and give a response within 2 minutes and is suitable for the detection of the NOx concentration in a wide range.

Description

technical field [0001] The invention relates to a fully solidified mixed potential NOx sensor and a preparation method thereof, which are suitable for NOx (NO+NO 2 ) concentration detection. Background technique [0002] Nitrogen oxides (NOx) are typical air pollutants that can cause acid rain, photochemical smog, etc. The use of fossil fuels, vehicle exhaust emissions and other reasons will cause the increase of nitrogen dioxide in the air. Excessive concentration of nitrogen dioxide in the air will cause diseases such as respiratory system and lung damage, and also have a certain destructive effect on the ozone layer in the atmosphere. Seriously endanger people's health. Therefore, NOx sensors used for NOx concentration detection are widely used. In the fields of environmental protection, medical treatment, metallurgy, transportation, etc., they are not only used to detect harmful NOx emissions, but also used for production process control, industrial safety assurance, a...

AI Technical Summary

Problems solved by technology

In this preparation method, due to the inconsistent shrinkage of the two materials during the sintering process, the electrolyte and the sensitive electrode are prone to peeling off, resulting in cracking, warping, separation, etc., which greatly reduces the three-phase reaction interface (gas, zirconia, etc.) base electrolyte, sensitive electrode), which reduces the catalytic activity of the sensitive electrode, the oxidation and reduction reaction speed of the electrode surface, and finally affects the detection sensitivity of the sensor in the high temperature section (>700°C)

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