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Mixed-potential nitrogen dioxide sensor based on porous YSZ (yttria stabilization zirconia) substrate and preparation method for sensor

A mixed potential type, nitrogen dioxide technology, applied in instruments, scientific instruments, material analysis through electromagnetic means, etc., can solve the problem that the sensitivity cannot meet the practical requirements, and achieve the promotion of practical application, cost reduction and sensitivity improvement Effect

Active Publication Date: 2012-06-13
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, one of the main factors limiting the practical application of this sensor is that the sensitivity has not yet met the practical requirements.

Method used

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  • Mixed-potential nitrogen dioxide sensor based on porous YSZ (yttria stabilization zirconia) substrate and preparation method for sensor
  • Mixed-potential nitrogen dioxide sensor based on porous YSZ (yttria stabilization zirconia) substrate and preparation method for sensor
  • Mixed-potential nitrogen dioxide sensor based on porous YSZ (yttria stabilization zirconia) substrate and preparation method for sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Add 5% starch to YSZ powder as a pore-forming agent, use double-layer casting and pore-forming technology to obtain a YSZ substrate, and use MnCr 2 o 4 As a sensitive electrode, Pt is used as a reference electrode to make a mixed potential type NO 2 Sensor, its specific production process:

[0057] 1. Make the YSZ substrate of the sensor. Two slurries, slurry A and slurry B, were prepared. Select commercially available YSZ powder (doped with 4 grams of Y 2 o 3 ZrO 2 ) 50g, add solvent ethanol 25ml, solvent butanone 50ml, binder PVB 7g, dispersant triethanolamine 3ml, plasticizer DE P12ml, stir to obtain slurry A without starch.

[0058] Slurry B is based on the slurry A, and then add 2.5g of starch, stir evenly to obtain slurry B with added starch.

[0059] After the two kinds of slurries were ball milled for 12 hours, 7 g of binder PVB were added again, ball milled for another 12 hours, placed in a vacuum mixer, and vacuum defoamed for 1 hour.

[0060] The fron...

Embodiment 2

[0074] Add 10% starch to the YSZ powder as a pore-forming agent, and the rest of the operating steps and conditions are the same as in Example 1.

[0075] Table 2 lists the devices made with 10% starch and pore-forming YSZ substrates at different concentrations of NO. 2 The difference between the electromotive force in the atmosphere and the electromotive force in the air (ΔEMF) varies with NO 2 As can be seen from the table, the sensitivity of the sensor is improved by adding 10% pore-forming agent to the double-layer casting slurry, and it can be compared with Table 1 in Example 1. It was found that the difference in electromotive force (ΔEMF) was significantly higher than that of the sensor with 5% starch content.

[0076] Table 2. The ΔEMF of the devices made of YSZ substrates without pores and with 10% starch pores as a function of NO 2 change in concentration

[0077]

Embodiment 3

[0079] Add 15% starch to the YSZ powder as a pore-forming agent, and the rest of the operating steps and conditions are the same as in Example 1.

[0080] Table 3 lists the devices without pores and with 15% starch pore-forming YSZ substrates at different concentrations of NO 2 The difference between the electromotive force in the atmosphere and the electromotive force in the air (ΔEMF) varies with NO 2 As can be seen from the table, the sensitivity of the sensor is improved by adding 15% pore-forming agent to the double-layer casting slurry, and it can be compared with Example 1 and Example 2. It was found that the difference in electromotive force (ΔEMF) was significantly higher than that of the sensors with starch content of 5% and 10%. Taking the measurement of 500ppm as an example, the ΔEMF of Example 3 is increased by 25mV compared with that of the comparative example.

[0081] Table 3. The ΔEMF of the sensors made of YSZ substrates without pores and with 15% starch po...

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Abstract

The invention belongs to the technical field of gas sensors, and particularly relates to a mixed-potential nitrogen dioxide sensor with an efficient three-phase interface based on a porous YSZ (yttria stabilization zirconia) substrate and a preparation method for the sensor. The sensor is mainly used for detecting automobile exhaust, and sequentially comprises an Al2O3 ceramic plate, the porous YSZ substrate, a Pt (platinum) reference electrode and an MnCr2O4 sensitive electrode, wherein the Al2O3 ceramic plate is provided with a Pt heating electrode, one side of the porous YSZ substrate is provided with a pore-forming surface, both the reference electrode and the sensitive electrode are bar-shaped and symmetrically positioned at two ends of the pore-forming surface of the porous YSZ substrate close to a boundary, the porous YSZ substrate is provided with a planar double-layer structure, the surface of the porous YSZ substrate is rough and porous, and the porous YSZ substrate is prepared by casting YSZ slurry added with pore-forming agent starch on a YSZ cast biscuit after low-temperature degreasing and high-temperature sintering. By using MnCr2O4 as the sensitive electrode and adding the three-phase interface of the mixed-potential NO2 sensor, sensitivity of the sensor is enhanced.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to a porous YSZ substrate-based hybrid potential nitrogen dioxide sensor with a high-efficiency three-phase interface and a preparation method thereof. The sensor is mainly used for the detection of automobile exhaust. Background technique [0002] Energy and environmental issues have become the bottleneck restricting the development of human society, and energy conservation and emission reduction on a global scale are imminent; as a rapidly rising power, my country is taking corresponding responsibilities, paying special attention to energy conservation and emission reduction. For automobiles, the key to energy saving and emission reduction is to improve engine technology. The lean-burn engine is combustion under the condition of greater than the theoretical air-fuel ratio of 14.6 (A / F>20, the maximum is 28-30). Due to the full combustion of fuel, the lean-burn e...

Claims

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Application Information

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IPC IPC(8): G01N27/407
Inventor 梁喜双尹成果卢革宇历建国刁泉张含厉健峰胡光斓
Owner JILIN UNIV
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