a kind of la 2 nio 4 ysz-based hybrid potential type h for sensitive electrodes 2 s sensor and its preparation method

A hybrid potential-type, sensitive electrode technology, applied in chemical instruments and methods, instruments, scientific instruments, etc., can solve the problems of inability to detect diabetes diagnosis in real time, high price, large volume, etc., and achieve the improvement of the minimum detection limit and simple preparation method , The effect of low raw material prices

Active Publication Date: 2020-03-10
JILIN UNIV
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  • Description
  • Claims
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Problems solved by technology

[0003] Currently, detection of low concentrations of H 2 S mainly relies on large-scale analytical instruments, such as mass spectrometry and spectroscopy. However, its large size, high price, and inability to detect in real time limit its application in diabetes diagnosis.

Method used

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  • a kind of la <sub>2</sub> nio <sub>4</sub> ysz-based hybrid potential type h for sensitive electrodes <sub>2</sub> s sensor and its preparation method
  • a kind of la <sub>2</sub> nio <sub>4</sub> ysz-based hybrid potential type h for sensitive electrodes <sub>2</sub> s sensor and its preparation method
  • a kind of la <sub>2</sub> nio <sub>4</sub> ysz-based hybrid potential type h for sensitive electrodes <sub>2</sub> s sensor and its preparation method

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Effect test

Embodiment 1

[0050] Preparation of La using the sol-gel method 2 NiO 4 Sensitive electrode material, by adding different amounts of citric acid to improve the microscopic morphology of the electrode material, the sintering temperature is 1000 ° C, using this material to make YSZ-based hybrid potential type H 2 S sensor, and test the gas sensitivity characteristics of the sensor, the specific process is as follows:

[0051] 1. Make a Pt reference electrode: use Pt slurry to make a layer of Pt reference electrode with a length of 0.5mm*2mm and a thickness of 20μm on one end of the upper surface of the YSZ substrate with a length and width of 2mm and a thickness of 0.2mm, and use a 2cm long Pt reference electrode After the Pt wire is folded in half, it is glued to the middle of the reference electrode to lead out the electrode lead; then the YSZ substrate is baked at 120°C for 2 hours, and then put into a muffle furnace for sintering at 950°C for half an hour, so as to eliminate the loosenes...

Embodiment 2

[0058] Tested La 2 NiO 4 YSZ-based hybrid potential type H for sensitive electrode materials 2 Sensitivity of the S sensor.

[0059] Connect the sensor on the Rigol signal tester, put the sensor made of three different electrode materials at 500ppb H 2 The voltage signal test was carried out in S atmosphere.

[0060] Table 1 lists the YSZ-based hybrid potentiometric sensors made of three materials as electrode materials at 500ppbH 2 Response values ​​in S atmosphere. It can be seen from the table that when the molar ratio of citric acid to metal ions is 1:1, the device is 2 S has the largest response value. It can be seen that the sensitive characteristics of sensitive electrode materials can be affected by changing the amount of complexing agent citric acid added. Table 2 lists the sensors placed in air, 0.1ppm H 2 S, 0.2ppm H 2 S, 0.5ppm H 2 S, 1ppmH 2 S, 2ppmH 2 S. The potential signal test in the atmosphere and the potential signal test of the above atmosphere ...

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Abstract

The invention discloses a YSZ (yttria-stabilized zirconia)-based mixed potential type hydrogen sulfide (H2S) sensor with La2NiO4 used as a sensitive electrode and a method for preparing the YSZ-basedmixed potential type hydrogen sulfide sensor, and belongs to the technical field of gas sensors. The YSZ-based mixed potential type hydrogen sulfide sensor is mainly used for detecting toxic gas H2S in industrial production and daily life. The YSZ-based mixed potential type hydrogen sulfide sensor sequentially comprises an Al2O3 ceramic plate with Pt heating electrodes, a YSZ-based plate, a Pt reference electrode and the La2NiO4 sensitive electrode. The reference electrode and the sensitive electrode are independently and symmetrically prepared at two ends of the upper surface of the YSZ-basedplate, and the lower surface of the YSZ-based plate is adhered with the Al2O3 ceramic plate with the Pt heating electrodes. The YSZ-based mixed potential type hydrogen sulfide sensor and the method have the advantages that the La2NiO4 with high electrochemical catalytic activity is used as the sensitive electrode, the quantities of citric acid and the like which are added in material synthesis procedures are changed, accordingly, the electrochemical catalytic activity of sensitive electrode materials can be enhanced, and effects of improving the sensitivity characteristics of the YSZ-based mixed potential type hydrogen sulfide sensor can be realized; a short temperature pulse is applied in sensor recovery procedure, accordingly, the recovery time of the YSZ-based mixed potential type hydrogen sulfide sensor can be shortened, and the purpose of enhancing the response and recovery characteristics of the YSZ-based mixed potential type hydrogen sulfide sensor can be achieved.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a 2 NiO 4 YSZ-based hybrid potential-type hydrogen sulfide (H 2 S) sensor and preparation method, it is mainly used in the toxic gas H in industrial production and daily life 2 Detection of S. Background technique [0002] Hydrogen sulfide, molecular formula H 2 S, with a molecular weight of 34.076, is a flammable acid gas under standard conditions, colorless and poisonous. Today, petroleum, as one of the important fossil fuels, has important applications in many fields. So every country has big pumping operations. However, in the oil drilling industry, high pressure and deep drilling always inevitably encounter H 2 S formation. As a highly toxic gas, the toxicity of hydrogen sulfide is second only to HCN. Currently, H 2 The death toll of S poisoning has become second only to CO. When H 2 S concentration is higher than 0.05ppm, it will have a unique kind of unpleas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/30C01F17/00C04B28/26
CPCC01F17/276C04B28/26C04B2111/00482C04B2111/00844G01N27/30G01N27/301C04B14/303
Inventor 卢革宇郝熙冬梁喜双刘方猛孙鹏孙彦峰高原刘凤敏
Owner JILIN UNIV
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