Non-imidazole ionic liquid for proton exchange membrane fuel cell electrolyte

A proton exchange membrane and fuel cell technology, applied in solid electrolyte fuel cells, fuel cells, circuits, etc., can solve problems such as relatively difficult, less applied research, and low cation stability

Inactive Publication Date: 2015-03-25
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of this patent is to propose a non-imidazole ionic liquid as the electrolyte of PEMFC. Among the many researched ionic liquids, pyridine ionic liquid is an important type of ionic liquid, but the application research of the electrolyte in PEMFC is relatively rare. This is because the cationic stability of this type of ionic liquid is lower than that of imidazole-based ionic liquids, so the process of functionalization is more difficult

Method used

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  • Non-imidazole ionic liquid for proton exchange membrane fuel cell electrolyte
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Ethylpyridine hydrogen sulfate ([Epdy]HSO 4 )synthesis

[0017] (1) Add 0.1 mol of pyridine to a single-neck flask, and then add 0.1 mol of diethyl sulfate. After the addition, heat and stir in a water bath at 50° C. for about 12 hours to obtain an aqueous solution of a colorless transparent ionic liquid.

[0018] (2) The above liquid and 0.15 mol KAC were separately dissolved in ethanol, and then the two solutions were mixed to remove the resulting white precipitate, and the filtrate was collected to obtain a colorless liquid.

[0019] (3) Add 0.15 mole of H to the solution 2 SO 4 , Stir evenly to obtain a colorless transparent liquid. The liquid is evaporated in a rotary evaporator to remove most of the water ethanol and the produced acetic acid to obtain a light yellow viscous liquid, which can be dried in vacuum to obtain a more viscous light yellow liquid, which is the product.

Embodiment 2

[0020] Example 2: Butylpyridine hydrogen sulfate ([Bpdy]HSO 4 )synthesis

[0021] (1) Add 0.1 mol of pyridine to a single-necked flask, and then add 0.1 mol of dibutyl sulfate. After the addition, heat and stir in a water bath at 50° C. for about 12 hours to obtain an aqueous solution of a colorless transparent ionic liquid.

[0022] (2) The above liquid and 0.15 mol KAC were separately dissolved in ethanol, and then the two solutions were mixed to remove the resulting white precipitate, and the filtrate was collected to obtain a colorless liquid.

[0023] (3) Add 0.15 mole of H to the solution 2 SO 4 , Stir evenly to obtain a colorless transparent liquid. The liquid is evaporated in a rotary evaporator to remove most of the water ethanol and the produced acetic acid to obtain a light yellow viscous liquid, which can be dried in vacuum to obtain a more viscous light yellow liquid, which is the product.

Embodiment 3

[0024] Example 3: Propylpyridine hydrogen sulfate ([Ppdy]H 2 PO 4 )synthesis

[0025] (1) Add 0.1 mol of ethyl pyridine in a single-necked flask, and then add 0.1 mol of dipropyl sulfate. After the addition, heat and stir in a water bath at 50° C. for about 12 hours to obtain a colorless transparent ionic liquid aqueous solution.

[0026] (2) The above liquid and 0.15 mol KAC were separately dissolved in ethanol, and then the two solutions were mixed to remove the resulting white precipitate, and the filtrate was collected to obtain a colorless liquid.

[0027] (3) Add 0.15 mole of H to the solution 2 SO 4 , Stir evenly to obtain a colorless transparent liquid. The liquid is evaporated in a rotary evaporator to remove most of the water ethanol and the produced acetic acid to obtain a light yellow viscous liquid, which can be dried in vacuum to obtain a more viscous light yellow liquid, which is the product.

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Abstract

The invention discloses a synthesis method for preparing a non-imidazole ionic liquid for a proton exchange membrane fuel cell electrolyte. The synthesis method comprises the following steps: dialkyl sulfate and pyridine react, a product generated after the reaction reacts with a KAC ethanol solution or an NaAC ethanol solution, the generated precipitate is removed by filtering to obtain a colorless and transparent solution, an acid with a proton conduction function is added in the solution, and the acetate of the salt is replaced to obtain the ionic liquid with cations as non-imidazole ions. The adverse effects of an imidazole ionic liquid on proton exchange membrane fuel cell catalysts are avoided, which can be verified through a cyclic voltammetry electrochemical method and other electrochemical methods. The ionic liquid is carried in a PVDF membrane to perform a single battery experiment, and the result shows that the ionic liquid is taken as the ionic liquid for the electrolyte, so that the performance is obviously improved, and compared with the imidazole ionic liquid, the highest power density can be improved by about 15 times.

Description

1. Technical Field [0001] The present invention relates to ionic liquid synthesis. 2. Background technology [0002] Ionic liquids are a class of salts with melting points below 100°C (see: Fernicola, A.; Scrosati, B.; Ohno, H., Potentialities of ionic liquids as new electrolyte media in advanced electrochemical devices. Ionics 2006, 12(2) , 95-102.). Such salts usually consist of cations with relatively large volume and poor symmetry and anions with relatively small volume and good symmetry. It has the characteristics of high conductivity, low vapor pressure and strong solubility, and is considered to be a green chemical reaction medium that can replace traditional volatile solvents. With the gradual in-depth exploration of the understanding of ionic liquids, its applications have far exceeded the original green chemistry category, and there are huge application prospects in the fields of electrolysis, solar cells, catalysts and even medicine. In recent years, due to the high...

Claims

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Application Information

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IPC IPC(8): C07D213/20C07D213/127H01M8/10H01M8/1016
CPCC07D213/127C07D213/20H01M8/1016Y02E60/50
Inventor 高建张婷婷秦伟谭小耀初园园卢素敏
Owner TIANJIN POLYTECHNIC UNIV
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