Method for preparing multiple-electrode electrochemical gas sensor

A gas sensor, electrochemical technology, applied in the direction of electrochemical variables of materials, etc., can solve problems such as single measurement

Inactive Publication Date: 2009-05-20
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These sensors are designed with two and three electrodes and can only measure a single gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Example 1: Prepare a 5-electrode electrochemical sensor, clean and dry the pre-selected film, and fix it flat on the screen printing equipment; fix the printing template on the upper surface of the printed film; according to the mass ratio of 2:8 Proportionally weigh the binder and the catalyst; mix the catalyst and the binder, and disperse evenly through an ultrasonic disperser; print the dispersed slurry on the PTFE waterproof and breathable membrane by scraping, and the working electrode The thickness of the membrane is 0.05 mm. The catalyst on the membrane is composed of two semicircular electrodes, one side of which is a platinum working electrode, and the catalyst loading is 2 mg / cm 2 , the other side is a gold working electrode, and the catalyst loading is 2 mg / cm 2 , the electrode area is 1cm 2 , the electrode area of ​​the reference electrode and two auxiliary electrodes is 2cm 2 , with a catalyst loading of 2 mg / cm 2 , clean the electrodes again, and sinter...

Embodiment 2

[0010] Example 2: Preparation of a 5-electrode electrochemical sensor, the preparation steps are the same as in Example 1, wherein the mass ratio of the binder to the catalyst is 1:9, the thickness of the working electrode film is 0.2 mm, and the catalyst on the film is composed of two semicircular Electrode composition, one side of which is platinum working electrode, catalyst loading 20 mg / cm 2 , the other side is a gold working electrode, and the catalyst loading is 20 mg / cm 2 , the electrode area is 2cm 2 , the electrode area of ​​the reference electrode and two auxiliary electrodes is 4cm 2 , with a catalyst loading of 20 mg / cm 2 , the electrodes were cleaned again, and the cleaned electrodes were sintered at 180° C. for 40 minutes under the protection of high-purity nitrogen.

Embodiment 3

[0011] Example 3: Preparation of a 5-electrode electrochemical sensor, the preparation steps are the same as in Example 1, wherein the mass ratio of the binder to the catalyst is 3:7, the thickness of the working electrode film is 0.1 mm, and the catalyst on the film is composed of two semicircular Electrode composition, one side of which is platinum working electrode, catalyst loading 10 mg / cm 2 , the other side is a gold working electrode, and the catalyst loading is 10 mg / cm 2 , the electrode area is 2cm 2 , the electrode area of ​​the reference electrode and two auxiliary electrodes is 4cm 2 , with a catalyst loading of 10 mg / cm 2 , the electrodes were cleaned again, and the cleaned electrodes were sintered at 240° C. for 30 minutes under the protection of high-purity nitrogen gas.

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PUM

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Abstract

The invention belongs to a method for producing a multi-electrode electrochemical gas sensor, which consists of two working electrodes, two auxiliary electrodes and a reference electrode, wherein the two working electrodes are a platinum air electrode and a gold air electrode respectively, and the reference electrode and the auxiliary electrodes are all platinum air electrodes. The assembly of the sensor is as follows: the electrodes adopt laminated placement and have a sandwich structure and the integrated gold and platinum working electrodes, the reference electrode and the two auxiliary electrodes are arranged from the top down respectively. When the sensor tests mixed gas of carbon monoxide and hydrogen sulfide, a total response signal of the two gas is generated on the platinum working electrode, and a response signal of hydrogen sulfide gas is generated on the gold working electrode, thus the response signals of the thereby simplifying a test method and also greatly reducing actual application cost.

Description

technical field [0001] The invention is a preparation method of a multi-electrode electrochemical gas sensor. Background technique [0002] Electrochemical gas sensors have the advantages of detecting many types of gases, wide concentration range, small size, low power consumption, and can be used for on-site monitoring. Therefore, this kind of sensor has been widely used in industrial and agricultural monitoring and detection fields. The basic properties of the gas are consistent, so there is a problem of cross-interference between different gases in the actual monitoring process. Especially in petrochemical, iron and steel smelting and other industries, the coexistence of carbon monoxide and hydrogen sulfide often occurs, and the three-electrode electrochemical carbon monoxide and hydrogen sulfide gas sensors used in industrial transmitters have cross-interference problems in practical applications. Both carbon monoxide and hydrogen sulfide gas have response signals, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/27
Inventor 华凯峰苏怡吕翔宇刘世伟李翠玲王玉江
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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