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High-selectivity electrochemical hydrogen sulfide sensor and working electrode preparation method

A hydrogen sulfide sensor, high-selectivity technology, applied in the direction of material electrochemical variables, scientific instruments, instruments, etc., can solve the problems of difficult diffusion, drop, catalyst waste sensitivity and response speed, etc.

Pending Publication Date: 2022-02-01
南京伊桥科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrodes prepared by the traditional screen printing method, because the gas only reacts on the surface of the electrode, it is difficult to diffuse into the interior, resulting in a waste of catalyst and a decrease in sensitivity and response speed

Method used

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  • High-selectivity electrochemical hydrogen sulfide sensor and working electrode preparation method
  • High-selectivity electrochemical hydrogen sulfide sensor and working electrode preparation method
  • High-selectivity electrochemical hydrogen sulfide sensor and working electrode preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: the preparation of a kind of highly selective electrochemical hydrogen sulfide sensor working electrode comprises the following steps:

[0037] S1: Add in the reactor in turn:

[0038]

[0039] The pretreatment method of VXC-72 carbon black is to use nitric acid with a mass fraction of 45% to 60% to ultrasonically treat at 50°C to 75°C for 1h to 4h, and then dry it for use;

[0040] After mixing, use a high-shear homogeneous emulsifier to disperse and emulsify, and obtain an electrode slurry in a uniform and viscous colloidal state after homogeneous emulsification for 1 hour;

[0041] S2: Coating the electrode slurry on a porous waterproof and breathable membrane made of polytetrafluoroethylene by screen printing to obtain a working electrode diaphragm;

[0042]S3: Place the coated working electrode diaphragm in the air, dry it naturally for 30 minutes, and then dry it in a vacuum drying oven at a low temperature at 50°C for 120 minutes, then transfer ...

Embodiment 2

[0044] Embodiment 2: the preparation of a kind of highly selective electrochemical hydrogen sulfide sensor working electrode comprises the following steps:

[0045] S1: Add in the reactor in turn:

[0046]

[0047] The pretreatment method of VXC-72 carbon black is to use nitric acid with a mass fraction of 45% to 60% to ultrasonically treat at 50°C to 75°C for 1h to 4h, and then dry it for use;

[0048] After mixing, use a high-shear homogeneous emulsifier to disperse and emulsify, and obtain an electrode slurry in a uniform and viscous colloidal state after homogeneous emulsification for 1 hour;

[0049] S2: Coating the electrode slurry on a porous waterproof and breathable membrane made of polytetrafluoroethylene by screen printing to obtain a working electrode diaphragm;

[0050] S3: Place the coated working electrode diaphragm in the air, dry it naturally for 30 minutes, and then dry it in a vacuum drying oven at a low temperature at 50°C for 120 minutes, then transfer...

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PUM

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Abstract

The high-selectivity electrochemical hydrogen sulfide sensor comprises a hollow shell. One end of the shell is provided with an opening, the opening end of the shell is provided with a top cover, the top cover is provided with an air inlet hole allowing detected gas to enter, the end, away from the opening, in the shell is provided with a liquid storage cavity, the liquid storage cavity is filled with electrolyte, and the top of the liquid storage cavity is provided with a porous supporting plate; a working electrode is arranged between the top cover and the porous supporting plate in the shell, an electrode pin is arranged on the side, away from the top cover, of the shell, a conductive wire located in the shell is connected to the electrode pin, and the conductive wire is connected with the working electrode. The sensor has high single selective response to hydrogen sulfide gas, and is high in detection accuracy and good in stability. The invention further provides a preparation method of the high-selectivity electrochemical hydrogen sulfide sensor working electrode.

Description

technical field [0001] The invention relates to the technical field of gas sensors, in particular to a highly selective electrochemical hydrogen sulfide sensor. Background technique [0002] Hydrogen sulfide is a widely used toxic gas, widely used in chemical industry, light industry and other fields. Hydrogen sulfide is a highly toxic and harmful gas. It is colorless, flammable, and has an irritating stench. It has irritating and corrosive effects on the upper respiratory tract of animals or humans. It is adsorbed on the skin and conjunctiva, causing irritation and inflammation, which is very harmful. In order to prevent hydrogen sulfide gas leakage accidents, it is necessary to monitor the concentration of hydrogen sulfide gas in the working environment. At present, electrochemical hydrogen sulfide sensors are usually used to realize environmental monitoring. [0003] Electrochemical hydrogen sulfide sensors are mainly divided into three categories: potential type, direc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N27/30G01N27/416
CPCG01N27/26G01N27/30G01N27/4162
Inventor 张文庆马俊平张东旭
Owner 南京伊桥科技有限公司