YSZ (Yttria Stabilization Zirconia)-based mixed potential type NO2 sensor with high-efficiency three-phase boundary and preparation method thereof

A hybrid potential type and sensor technology, which is applied in instruments, scientific instruments, and material analysis through electromagnetic means, can solve problems such as endangering human health and air pollution, and achieve cost saving, good mechanical strength, and easy promotion.

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

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Problems solved by technology

But the O in the exhaust 2 If the concentration is too high, HC and CO in the tail gas cannot be fully and effectively used to reduce NO 2 , so that the traditional three-way catal

Method used

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  • YSZ (Yttria Stabilization Zirconia)-based mixed potential type NO2 sensor with high-efficiency three-phase boundary and preparation method thereof
  • YSZ (Yttria Stabilization Zirconia)-based mixed potential type NO2 sensor with high-efficiency three-phase boundary and preparation method thereof
  • YSZ (Yttria Stabilization Zirconia)-based mixed potential type NO2 sensor with high-efficiency three-phase boundary and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] In the above YSZ powder, additionally add PMMA with a powder mass percentage of 5% as a pore-forming agent, and configure slurry A1 . The porous YSZ substrate was prepared by scraping coating pore-making technology, and then on the porous surface of YSZ, NiO was used as a sensitive electrode and Pt was used as a reference electrode to make a mixed potential NO 2 Sensor, its operating steps and conditions are the same as Comparative Example 1.

[0080] Table 1 has listed the potential difference change value (ΔEMF) between the sensitive electrode and the reference electrode without making holes and using 5% PMMA pore forming agent through the YSZ substrate obtained by scraping method. 2 As for the change value of the concentration, it can be seen from the table that adding 5% PMMA pore-forming agent to the slurry by the scraping method can improve the sensitivity of the sensor, but the change is not much.

[0081] Table 1. The ΔEMF of the sensors made of YSZ substrates ...

Embodiment 2

[0084] In the above YSZ powder, additionally add PMMA with a mass percentage of 10% as a pore-forming agent, and configure slurry A 2 . All the other operating steps and conditions are the same as in Example 1.

[0085] Listed in table 2 is not made holes and with 10% PMMA made holes YSZ substrate the potential difference change value (ΔEMF) between the sensitive electrode and the reference electrode of the device made with NO 2 The change value of concentration, as can be seen from the table, adds 10% PMMA pore-forming agent in slurry by scraping method, and the sensitivity of sensor is improved preferably, it can be compared with table 1 in embodiment 1 It was found that the difference in electromotive force (ΔEMF) was significantly higher than that of the sensor with 5% PMMA content.

[0086] Table 2. The ΔEMF of devices made without holes and YSZ substrates with 10% PMMA holes versus NO 2 change in concentration

[0087]

[0088]

Embodiment 3

[0090] In the above YSZ powder, additionally add PMMA with a mass percentage of 15% as a pore-forming agent, and configure slurry A 3 , all the other operating steps and conditions are the same as in Example 1.

[0091] Listed in table 3 is not to make hole and with 15%PMMA make hole YSZ substrate to make the potential difference change value (ΔEMF) between the sensitive electrode and the reference electrode of the device with NO 2 The change value of concentration, as can be seen from the table, adds 15% PMMA pore-forming agent in slurry by scraping method, also has good improvement to the sensitivity of sensor, but it is compared with table 1 and implementation in embodiment 1 Comparing Table 2 in Example 2, it can be found that the difference in electromotive force (ΔEMF) is slightly higher than that of a sensor with a PMMA content of 5%, and significantly lower than that of a sensor with a PMMA content of 10%. It shows that too much doping of the pore-forming agent reduce...

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Abstract

The invention discloses a porous YSZ (Yttria Stabilization Zirconia) substrate-based mixed potential type NO2 sensor with a high-efficiency three-phase boundary and a preparation method thereof, belonging to the technical field of gas sensors. The sensor sequentially consists of an Al2O3 ceramic plate provided with a Pt heating electrode, the porous YSZ substrate of which one side is provided with a pore-forming surface, a Pt reference electrode and an NiO sensitive electrode, wherein the reference electrode and the sensitive electrode are both of strip-shaped structures and are symmetrically arranged close to the edge on the pore-forming surface of the porous YSZ substrate; the porous YSZ substrate is prepared by steps of blade-coating of a layer of a YSZ sizing agent added with pore forming agents on the YSZ substrate, low-temperature degreasing and high-temperature sintering, and is of a double-layer structure of which the surface is rough and porous. The pore forming agents have three types, including PMMA (Polymethyl Methacrylate), graphite and starch, and the doping ratios of the three types of pore forming agents are all 5% to 15%. By increasing the reaction area and active sites of the three-phase boundary of the mixed potential type NO2 sensor, the sensitivity of the sensor is improved.

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 high-efficiency three-phase interface based on a porous YSZ substrate. 2 A sensor and a preparation method thereof, the sensor is mainly used for the detection of automobile exhaust. Background technique [0002] With the increasingly serious environmental pollution, human beings pay more and more attention to the prevention and treatment of pollution sources. Automobile exhaust is a pollution source that cannot be ignored, most of which are harmful substances enough to endanger human health. In order to minimize environmental pollution, countries pay more attention to energy saving and emission reduction, formulate strict exhaust emission standards, and regulate fuel, reduce lead content, and increase the emphasis on exhaust gas detection, and actively promote the installation of exhaust gas purification device. [0003] The ...

Claims

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Application Information

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IPC IPC(8): G01N27/407
Inventor 卢革宇程晓杨梁喜双孙鹏刘凤敏
Owner JILIN UNIV
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