Preparation method of formaldehyde electrochemical sensor membrane electrode

A membrane electrode and electrochemical technology, applied in the direction of electrochemical variables of materials, nanotechnology for sensing, nanotechnology, etc., to achieve the effect of reducing the preparation process, high conductivity, and high detection accuracy

Pending Publication Date: 2021-10-15
MULTI IR OPTOELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that in the existing solid electrolyte membrane, the conductivity of the sulfonated polymer membrane drops sharply in an environment with low humidity, the preparation process of the composite proton exchange membrane is complex and the surface of the porous polymer support material needs to be hydrophilic Deal with the defects and provide a formaldehyde electrochemical sensor membrane that solves the water dependence problem of the sulfonated polymer electrolyte membrane, still has high conductivity in an environment with low humidity, has a simple preparation process, and does not require additional treatment Electrode preparation method

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  • Preparation method of formaldehyde electrochemical sensor membrane electrode
  • Preparation method of formaldehyde electrochemical sensor membrane electrode
  • Preparation method of formaldehyde electrochemical sensor membrane electrode

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Embodiment 1

[0036] Such as figure 1 As shown, a formaldehyde electrochemical sensor membrane electrode includes a self-humidifying working electrode film 1 , a solid electrolyte film 2 and a counter electrode film 3 , wherein the self-humidifying working electrode film 1 contains a hydrophilic material layer 11 .

[0037] The preparation method of formaldehyde electrochemical sensor membrane electrode comprises:

[0038] 1) Weigh 100 mg of the first catalyst, add 5 mL of deionized water for wetting, add 10 mL of ethanol and stir evenly, then add 2.5 mL of Nafion emulsion and stir evenly, and mix evenly to prepare counter electrode slurry A;

[0039] 2) Weigh 100mg of the second catalyst, add 5mL of deionized water to wet it, add 10mL of ethanol and stir evenly, then add 2.5mL of Nafion emulsion and stir evenly, after mixing evenly, take 50mL of electrode slurry and add nano-SiO 2 (content is 40wt%), mixed uniformly to obtain self-humidifying electrode slurry B;

[0040] 3) Print or smea...

Embodiment 2

[0043] Such as figure 1As shown, a formaldehyde electrochemical sensor membrane electrode includes a self-humidifying working electrode film 1 , a solid electrolyte film 2 and a counter electrode film 3 , wherein the self-humidifying working electrode film 1 contains a hydrophilic material layer 11 .

[0044] The preparation method of formaldehyde electrochemical sensor membrane electrode comprises:

[0045] 1) Weigh 100mg of the first catalyst, add 4mL of deionized water to wet it, add 15mL of ethylene glycol and stir evenly, then add 2mL of polytetrafluoroethylene emulsion and stir evenly, and mix evenly to prepare electrode slurry A;

[0046] 2) Weigh 100mg of the second catalyst, add 4mL of deionized water to wet it, add 15mL of ethylene glycol and stir evenly, then add 2mL of polytetrafluoroethylene emulsion and stir evenly, after mixing evenly, take 50mL of electrode slurry and add nano-SiO 2 (content is 30wt%), mixed uniformly to obtain self-humidifying electrode slur...

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Abstract

The invention discloses a preparation method of a formaldehyde electrochemical sensor membrane electrode. The preparation method comprises the following steps: preparing counter electrode slurry A; preparing self-humidifying working electrode slurry B; respectively printing or smearing the counter electrode slurry A and the self-humidifying working electrode slurry B on the upper surface and the lower surface of a solid electrolyte membrane, performing drying to form a membrane electrode containing a self-humidifying working electrode membrane and a counter electrode membrane, and performing hot pressing treatment to obtain the formaldehyde electrochemical sensor membrane electrode. The formaldehyde electrochemical sensor adopts the membrane electrode as a sensitive element, and has the characteristics of no liquid leakage, long service life and high detection precision. Meanwhile, the membrane electrode adopts a sulfonated polymer membrane as a solid electrolyte, the preparation process is simple and does not need additional treatment, the self-humidifying catalytic electrode membrane layer containing the hydrophilic substance solves the problem of water dependence of the sulfonated polymer electrolyte membrane, and the self-humidifying catalytic electrode membrane layer still has relatively high conductivity in an environment with relatively low humidity.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, relates to a sensor, in particular to a formaldehyde electrochemical sensor which solves the water dependence problem of a sulfonated polymer electrolyte membrane and still has relatively high conductivity in an environment with low humidity Preparation method of membrane electrode. Background technique [0002] The electrochemical gas sensor can directly convert the concentration of the measured gas into an electrical signal output. It has the characteristics of high sensitivity, accurate signal, simple operation and suitable for on-site detection. Therefore, it is widely used in the monitoring of air pollution, industrial waste gas and living environment. Quality monitoring. Sensitive elements are the core components of electrochemical sensors, and their performance directly affects the performance of sensors. Sensitive elements are usually composed of noble metal catalytic electrodes and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30B82Y15/00
CPCG01N27/30B82Y15/00
Inventor 吕晶汪晓波王吉应王鸿飞
Owner MULTI IR OPTOELECTRONICS
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