Preparation method of ionic liquid electrolyte system for electrochemical oxygen sensor

An oxygen sensor and ionic liquid technology, applied in the direction of material electrochemical variables, etc., can solve the problems of easy safety problems, small response current, low conductivity, etc., achieve short cycle of shape control, increase response current, and improve conductivity rate effect

Active Publication Date: 2017-09-26
HARBIN ENG UNIV
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  • Abstract
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  • Claims
  • Application Information

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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.

Method used

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  • Preparation method of ionic liquid electrolyte system for electrochemical oxygen sensor
  • Preparation method of ionic liquid electrolyte system for electrochemical oxygen sensor
  • Preparation method of ionic liquid electrolyte system for electrochemical oxygen sensor

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Experimental program
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Embodiment 1

[0030] Step 1: Weigh 0.05mol 1-methylimidazole and 0.055mol potassium hexafluorophosphate and mix them with 0.055mol ethyl bromide, 0.055mol propane bromide and 0.055mol butyl bromide respectively according to the ratio of 1:1.1:1.1, and use the one-pot method Heat and reflux in a water bath at 80°C for 3 hours, wash with ultra-pure water for 5 times after cooling, check the supernatant with silver nitrate solution for no light yellow precipitate, and obtain 1-ethyl-3-methylimidazole hexafluorophosphate (EMIMPF 6 ), 1-propyl-3-methylimidazolium hexafluorophosphate (PMIMPF 6 ) and 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF 6 );

[0031] Step 2: Select the most commonly used BMIMPF 6 0.05mol is mixed with 1-vinylimidazole (VIM) according to the mass ratio of 0%, 20%, 40%, 60%, 80% and 100%, and ultrasonically for 1h to ensure that the mixture is uniform, and the cyclic voltammetry curve test is carried out by finding The highest response current determines the ...

Embodiment 2

[0048] The difference between this embodiment and the first embodiment is that the said alkenylimidazole is 1-allyl-3-vinylimidazole. On this basis, we mixed polyethylene glycol into the final electrolyte, and tested the cyclic voltammetry curves of different scan rates and different oxygen concentrations on the final electrolyte.

[0049] Technical Note: Polyethylene glycol is widely used and researched in organic chemistry. It is usually used as a phase transfer catalyst because its linear polymer chain can form a shape similar to a crown ether. Due to its unique solubility, it is suitable for organic compounds. Separation and purification. In addition, polyethylene glycol, especially polyethylene glycol with a large molecular weight, can also be used as a supporting agent and the like. However, there is no report on adjusting the liquidity of the system. In view of the advantages of low toxicity, harmless to the environment, low melting point, high boiling point, thermal ...

Embodiment 3

[0051] The difference between the previous stage of this embodiment and the second embodiment is that the inorganic catalyst is foamed carbon loaded with nickel. On this basis, lithium bistrifluoromethanesulfonimide (LiTFSI) was added to the blend system, which can not only improve the conductivity but also increase the gas solubility. The final electrolyte was tested by cyclic voltammetry curves with different scan rates and different oxygen concentrations.

[0052] Technical note: LiTFSI is usually used as lithium salt of organic electrolyte for lithium batteries, which has high electrochemical stability and conductivity. In addition, it can be used as a Lewis acid catalyst for organic catalytic cracking, hydrocracking, catalytic reforming, isomerization, olefin hydration, toluene disproportionation, alcohol dehydration and acylation reactions. But there is no report about it as a sensor electrolyte additive. In addition, through Henry's law and gravity analysis microbalan...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/28G01N27/48
CPCG01N27/28G01N27/48
Inventor 刘婧媛刘颖王君张宏森刘琦陈蓉蓉李占双李茹民
Owner HARBIN ENG UNIV
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