Tetra-allkylammonium ionic liquid for proton exchange membrane fuel cell

A proton exchange membrane and fuel cell technology, applied in solid electrolyte fuel cells, fuel cells, circuits, etc., can solve problems such as difficult electrolytes, high melting point of ionic liquids, and few applied researches

Inactive Publication Date: 2015-03-04
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are relatively few studies on the application of electrolytes in PEMFC, because this type ...

Method used

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  • Tetra-allkylammonium ionic liquid for proton exchange membrane fuel cell
  • Tetra-allkylammonium ionic liquid for proton exchange membrane fuel cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment one: N, N, N trimethyl-N-butyl bisulfate ([N1114]HSO 4 )synthesis

[0016] (1) Add 0.1 mol trimethylamine aqueous solution to a single-necked flask, then add 0.1 mol dibutyl sulfate, heat and stir in a 50°C water bath for about 12 hours after the addition, to obtain a colorless transparent ionic liquid aqueous solution.

[0017] (2) Dissolve the above liquid and 0.15mol KOH in ethanol respectively, then mix the two solutions, remove the resulting white precipitate, and collect the filtrate to obtain a colorless liquid.

[0018] (3) Add 0.15 moles of H to the solution 2 SO 4 , stirred evenly to obtain a colorless transparent liquid. The liquid was evaporated in a rotary evaporator to remove most of the water, ethanol and acetic acid produced to obtain a light yellow viscous liquid, which was dried in vacuum to obtain a viscous light yellow liquid, which was the product.

Embodiment 2

[0019] Embodiment two: N, N, N trimethyl-N-propyl bisulfate ([N1113]HSO 4 )synthesis

[0020] (1) Add 0.1 mol trimethylamine aqueous solution to a single-necked flask, then add 0.1 mol dipropyl sulfate, heat and stir in a 50°C water bath for about 12 hours after the addition, to obtain a colorless transparent ionic liquid aqueous solution.

[0021] (2) Dissolve the above liquid and 0.15mol KOH in ethanol respectively, then mix the two solutions, remove the resulting white precipitate, and collect the filtrate to obtain a colorless liquid.

[0022] (3) Add 0.15 moles of H to the solution 2 SO 4 , stirred evenly to obtain a colorless transparent liquid. The liquid was evaporated in a rotary evaporator to remove most of the water, ethanol and acetic acid produced to obtain a light yellow viscous liquid, which was dried in vacuum to obtain a viscous light yellow liquid, which was the product.

Embodiment 3

[0023] Embodiment three: N, N, N trimethyl-N-ethyl bisulfate ([N1112]HSO 4 )synthesis

[0024] (1) Add 0.1 mol trimethylamine aqueous solution to a single-necked flask, then add 0.1 mol diethyl sulfate, heat and stir in a 50°C water bath for about 12 hours after the addition, to obtain a colorless transparent ionic liquid aqueous solution.

[0025] (2) Dissolve the above liquid and 0.15mol KOH in ethanol respectively, then mix the two solutions, remove the resulting white precipitate, and collect the filtrate to obtain a colorless liquid.

[0026] (3) Add 0.15 moles of H to the solution 2 SO 4, stirred evenly to obtain a colorless transparent liquid. Evaporate the liquid in a rotary evaporator to remove most of the water ethanol and the acetic acid produced to obtain a light yellow viscous liquid, dry it in vacuum and wash with ethanol to obtain a white solid, which is the product. Although this ionic liquid is not suitable as a PEMFC An electrolyte, but also a salt that c...

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Abstract

A synthetic method of non-imidazolium-based ionic liquid for preparing proton exchange membrane fuel cell electrolyte is disclosed. The synthetic method comprises the steps of reacting sulfuric acid dialkyl ester with trimethyl amine; reacting the reaction product with a KOH or NaOH ethanol solution, and filtering out the generated precipitation to obtain a clear colorless solution; adding acid with a proton conducting function to the solution, and neutralizing the quaternary amine base to obtain the ionic liquid, the cation of which is a tetra-alkylammonium ion. According to the synthetic method of the non-imidazolium-based ionic liquid for preparing the proton exchange membrane fuel cell electrolyte, the unbeneficial influence of the imidazolium-based ionic liquid on a proton exchange membrane fuel cell catalyst is avoided, which can be proofed by an electrochemical method, such as a cyclic voltammetry method. The ionic liquid is supported to a PVDF membrane to perform a single-cell experiment, and the experimental results show that, when the ionic liquid is taken as the ionic liquid of an electrolyte, the performance is remarkably improved; compared with the imidazolium-based ionic liquid, the non-imidazolium-based ionic liquid has the advantage that the top power density can be improved by about 60 times.

Description

1. Technical field [0001] The invention relates to the synthesis of ionic liquid and its application as a proton conducting medium. 2. Background technology [0002] Ionic liquids are a class of organic salts with a melting point 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 are generally composed of bulky, low-symmetry cations and relatively small, well-symmetry anions. This type of salt has the characteristics of high electrical conductivity, low vapor pressure, strong solubility, and non-flammability, and is considered to be a green chemical reaction medium that can replace traditional volatile solvents. With the gradual and in-depth exploration of the understanding of ionic liquids, their application research has far exceeded the original green chemistry category, and there are huge application prospects in the fields of sup...

Claims

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Application Information

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IPC IPC(8): H01M8/10H01M8/1016
CPCH01M8/102H01M8/1072Y02E60/50
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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