Mixing potential NO2 sensor based on sand-blast machining porous YSZ (Yttria Stabilized Zirconia) base plate and preparation method of sensor

A hybrid potential type, sandblasting technology, applied in the direction of material electrochemical variables, can solve the problems of limited performance improvement, small modification area, etc., to achieve multiple active sites, controllable roughness and surface area, good thermal stability and chemical stability

Active Publication Date: 2014-07-30
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method of modifying the three-phase interface is that the modified area is small, the inter-channel area is not treated, and the performance improvement is limited.

Method used

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  • Mixing potential NO2 sensor based on sand-blast machining porous YSZ (Yttria Stabilized Zirconia) base plate and preparation method of sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1: The YSZ substrate used in the sandblasting experiment, the sand particle size used is 40 μm, and the roughness is 364 nm.

[0055] The manufacturing process is to use the YSZ substrate with the roughness of 364nm processed by sandblasting to make the sensor device. Other manufacturing processes are the same as the comparative example.

[0056] Table 1 lists the devices made of unprocessed YSZ and sandblasted YSZ substrates with a roughness of 364nm at different concentrations of NO 2 The difference between the electromotive force in the atmosphere and the electromotive force in the air (ΔV) varies with NO 2 As can be seen from the table, the sensitivity of the device made of the YSZ substrate with a roughness of 364nm after sand blasting has some improvement, but the change is not much.

[0057] Table 1. ΔV vs. NO 2 change in concentration

Embodiment 2

[0058] Example 2: The YSZ substrate used in the sandblasting experiment has a sandblasting particle size of 60 μm and a roughness of 649 nm.

[0059] The manufacturing process is to use YSZ with a roughness of 649 nm as a substrate to manufacture a sensing device by sandblasting. Other manufacturing processes are the same as the comparative example.

[0060] Table 2 lists the devices made of unprocessed YSZ and sandblasted YSZ substrates with a roughness of 649nm at different concentrations of NO 2 The difference between the electromotive force in the atmosphere and the electromotive force in the air (ΔV) varies with NO 2 It can be seen from the table that the sensitivity of the device made of the YSZ substrate with a roughness of 649nm after sandblasting has been greatly improved.

[0061] Table 2. ΔV vs. NO 2 change in concentration

[0062]

[0063]

Embodiment 3

[0064] Example 3: The YSZ substrate used in the sandblasting experiment has a sandblasting particle size of 80 μm and a roughness of 775 nm.

[0065] The manufacturing process is to use YSZ with a roughness of 775nm sandblasting as a substrate to make a sensing device. Other manufacturing processes are the same as the comparative example.

[0066] Table 3 lists the devices made of unprocessed YSZ and sandblasted YSZ substrates with a roughness of 775nm at different concentrations of NO 2 The difference between the electromotive force in the atmosphere and the electromotive force in the air (ΔV) varies with NO 2 As can be seen from the table, the sensitivity of the device made of the sandblasted YSZ substrate with a roughness of 775nm is optimally improved.

[0067] Table 3. ΔV vs. NO 2 change in concentration

[0068]

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Abstract

The invention relates to a mixing potential NO2 sensor based on sand-blast machining type porous YSZ (Yttria Stabilized Zirconia) base plate and a preparation method of the sensor, and belongs to the technical field of gas sensors. The mixing potential NO2 sensor is mainly used for detecting automobile tail gas exhaust and sequentially comprises an Al2O3 ceramic plate, a YSZ base plate, a reference electrode and a sensitive electrode, wherein the Al2O3 ceramic plate is provided with a Pt heating electrode; the YSZ base plate has a rough porous surface; the reference electrode is made of strip-shaped Pt; the sensitive electrode is made of strip-shaped NiO; the two electrodes are mutually discretely and symmetrically prepared on the rough surface of the YSZ base plate; the lower surface of the YSZ base plate is adhered to the Al2O3 ceramic plate together. According to the mixing potential NO2 sensor, the sand-blast machining type YSZ base plate is utilized as electrolyte, and a rough porous structure of the surface of the sand-blast machining type YSZ base plate increases the contact of gas to be tested and the electrolyte so as to increase reaction activity sites, so that the purpose of enhancing the sensitivity of the sensor is achieved.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a mixed potential NO sensor with a sandblasted YSZ substrate with a rough porous surface as the electrolyte conductive layer. 2 Sensors and methods of making them. Background technique [0002] With the development of human industrialization, energy is used in large quantities, such as the burning of fossil fuels such as oil, natural gas, and coal, and the destruction of the natural environment is becoming more and more serious. One of the most concerned pollutant gases NO x (NO and NO 2 ), due to the large-scale use of automobiles, the pollution problem caused by it is becoming more and more serious, and the acid rain and photochemical smog caused by it cause great harm to human bodies and buildings. Countries all over the world on NO in automobile exhaust x emission standards are getting stricter. For diesel vehicles, due to the high concentration of residu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/26
Inventor 卢革宇孙睿泽梁喜双孙鹏刘凤敏
Owner JILIN UNIV
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