Preparation method of ionic liquid electrolyte system for electrochemical oxygen sensor

Abstract

The invention provides a preparation method of an ionic liquid electrolyte system for an electrochemical oxygen sensor. The preparation method comprises: mixing alkyl imidazole, alkyl halide and hexafluorophosphate in a ratio of 1:1.1:1.1, heating and refluxing in a water bath at 60-90 DEG C for 3-5 h, cooling, and washing with water until it is detected that no precipitate is produced in the upper layer of silver nitrate solution to obtain AMIMPF6 (1-alkyl-3-methylimidazolium hexa uorophosphate); mixing the AMIMPF6 with allyl imidazole, and ultrasonically treating for 1-2 h until uniform mixing; preparing electrolyte solution of electrodeposition inorganic matters, applying cathode current constantly in -5 mA to electrically deposit for 2400-360 s, collecting an inorganic catalyst by ultrasonic vibration, and mixing in the inorganic catalyst to obtain the final electrolyte. The preparation method is capable of synthesizing electrochemical oxygen sensor electrolyte high in oxygen sensitivity, good in catalytic performance and easy to prepare.

Description

technical field [0001] The invention relates to a method for preparing an electrolyte in an electrochemical oxygen sensor. Background technique [0002] Oxygen is not only an essential substance to maintain human life activities, but also a substance that needs to be controlled and measured most in various aspects such as industry, agriculture, energy, transportation, medical treatment, and ecological environment. Sensors for oxygen detection fall into many categories, among which electrochemical gas sensors are the most promising choice due to their excellent performance in sensitivity and selectivity. [0003] In the composition of electrochemical oxygen sensor, electrolyte is one of its key components. Although the use of traditional electrolytes has the advantages of high sensitivity and good selectivity, the following technical problems still need to be further improved in the actual application process, mainly reflected in: [0004] Problem 1: The water-based electro...

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Problems solved by technology

[0004] Problem 1: The water-based electrolyte is easy to dry up, the operating temperature range is narrow, it is easy to solidify at low temperature, easy to leak, easy to cause safety problems, and cause corrosion to electrodes;

However, the inherent high viscosity of ionic liquids makes them have relatively low conductivity, and the diffusion coefficient of gas molecules in ionic liquids is small, which leads to slow response of the sensor and small response current.

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