Electrochemical hydrogen sulfide sensor and preparation method

Abstract

The invention discloses an electrochemical hydrogen sulfide sensor. The device comprises a shell with a detachable top cover, a top cover of the shell is provided with an air inlet hole for air to enter; a liquid storage tank is arranged at the bottom of the shell; a supporting plate covering the liquid storage tank is arranged at the top of the liquid storage tank; support plate with porous structure, a working electrode, a reference electrode and a counter electrode are sequentially stacked in the shell in the direction from the air inlet to the liquid storage tank; electrolyte is stored inthe liquid storage tank; a liquid absorbing material III is arranged in the liquid storage tank; the liquid absorbing material III is of a drum-shaped structure, a liquid absorbing material I is arranged between the working electrode and the reference electrode, a liquid absorbing material II is arranged between the reference electrode and the counter electrode, pins respectively connected with the working electrode, the reference electrode and the counter electrode are arranged at the bottom of the shell, and an O-shaped ring is arranged between the working electrode and a top cover of the shell. The sensor is not interfered by foreign gas, has good selectivity, and is simple in structure, low in manufacturing difficulty and low in cost. The invention also provides a preparation method ofthe electrochemical hydrogen sulfide sensor.

Description

technical field [0001] The invention relates to an electrochemical hydrogen sulfide sensor, belonging to the technical field of electrochemical sensors. Background technique [0002] Hydrogen sulfide (chemical formula H 2 S) is a colorless, toxic gas with the smell of rotten eggs. High concentrations of hydrogen sulfide often exist in the closed environment of factories, oil fields, and sewers, which seriously threaten people's survival and health. Therefore, hydrogen sulfide gas must be strictly controlled. monitor. There are many kinds of sensors used to detect hydrogen sulfide, such as electrochemical type, semiconductor type, catalytic combustion type, optical fiber type, etc. Among them, the electrochemical hydrogen sulfide sensor has become the mainstream sensor for detecting hydrogen sulfide gas because of its fast response time, high sensitivity, stable output signal, good reproducibility, no need for heating, low power consumption, and good linearity. Among the r...

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Problems solved by technology

[0009] In addition, sensor electrodes generally use noble metal catalysts, and noble metals are expensive and have limited reserves

On the other hand, the production process of the sensor electrode is cumbersome, including preparation of catalyst, mixing slurry, coating, sintering, etc. The electrochemical hydrogen sulfide sensor includes three electrode sheets, a working electrode, a reference electrode, and a counter electrode. Each electrode The sheets need to be manufactured according to the technological process, and there are scraps in the process of manufacturing electrode sheets, which consumes a lot of manpower and financial resources

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