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Method for improving alcohol resisting selectivity of NAFION membrane

A selective, alcohol-resisting technology, applied in climate sustainability, sustainable manufacturing/processing, final product manufacturing, etc., can solve the problems of high cost, poor alcohol-resisting selectivity, etc. The effect of improving and improving the selectivity of hindered alcohol

Active Publication Date: 2019-08-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of existing NAFION proton exchange membranes, such as high cost and poor selectivity for alcohol inhibition

Method used

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  • Method for improving alcohol resisting selectivity of NAFION membrane
  • Method for improving alcohol resisting selectivity of NAFION membrane
  • Method for improving alcohol resisting selectivity of NAFION membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The embodiment of the present invention provides a method for improving the selectivity of NAFION membrane for alcohol inhibition. The polyaniline / graphite composite material is obtained by in-situ polymerization of polyaniline between graphite layers, and then the NAFION modified proton membrane is prepared by solvent replacement method, specifically include:

[0044] (1) Put 300mg of graphite powder into absolute ethanol solution, and ultrasonically clean it for 15 minutes;

[0045] (2) dry the graphite powder after cleaning, and add it into aniline for ultrasonic adsorption for 30 minutes;

[0046] (3) The graphite powder after ultrasonic adsorption is suction-filtered, and cleaned 3-5 times with absolute ethanol;

[0047] (4) Add the cleaned graphite powder into 75mL of HCl / H 2 SO 4 In mixed acid solution, HCl / H 2 SO 4 The concentration of HCl in the mixed acid solution is 0.5mol / L, H 2 SO 4 The concentration is 1mol / L, stir well, add 3.7gK while stirring 2 ...

Embodiment 2

[0053] The embodiment of the present invention provides a kind of method that improves NAFION film inhibition alcohol selectivity, and step (1)-(6) is identical with embodiment 1, only difference is that step (7) and step (8):

[0054] (7) Add 2 mL of N-methylpyrrolidone to 5 mL of NAFION stock solution with a mass fraction of 5wt.%, and evaporate the organic solvent in the stock solution by rotary evaporation under reduced pressure at 60° C. to obtain N-methyl pyrrolidone Pyrrolidone is the NAFION solution of solvent;

[0055] (8) Add 0.0216g polyaniline / graphite composite material composite material (in this embodiment, composite material doping amount is 10%) in the NAFION solution of solvent with N-methylpyrrolidone that step (7) obtains, will Pour the mixed solution of polyaniline / graphite powder composite material and NAFION solution into a glass dish, let it flow naturally and evenly cover the whole glass dish, and dry it to form a film.

Embodiment 3

[0057] The embodiment of the present invention provides a kind of method that improves NAFION film inhibition alcohol selectivity, and step (1)-(6) is identical with embodiment 1, only difference is that step (7) and step (8):

[0058] (7) Add 2 mL of N-methylpyrrolidone to 5 mL of NAFION stock solution with a mass fraction of 5wt.%, and evaporate the organic solvent in the stock solution by rotary evaporation under reduced pressure at 60° C. to obtain N-methyl pyrrolidone Pyrrolidone is the NAFION solution of solvent;

[0059] (8) Add 0.0432g polyaniline / graphite composite material composite material (in the present embodiment, composite material doping amount is 20%) in the NAFION solution of solvent with N-methylpyrrolidone that step (7) obtains, will Pour the mixed solution of polyaniline / graphite powder composite material and NAFION solution into a glass dish, let it flow naturally and evenly cover the whole glass dish, and dry it to form a film.

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Abstract

The invention belongs to the technical field of fuel cell materials, and particularly relates to a method for improving alcohol resisting selectivity of an NAFION membrane. The method comprises the following steps of firstly, obtaining a polyaniline / graphite composite material by in-situ polymerization of polyaniline between graphite layers, and then doping the composite material into an NAFION membrane by adopting a solvent replacement method to prepare an NAFION modified proton membrane. Compared with a stock solution membrane free of composite material addition, the electrochemical performance of the NAFION modified proton membrane prepared by the method of the invention is obviously improved; the proton conductivity is 0.061S / cm when the doping amount is 20%. cm; and when the doping amount is 30%, the methanol penetration rate can be 1.07*10 <-6> cm2 / S for the minimum.

Description

technical field [0001] The invention belongs to the technical field of fuel cell materials, and in particular relates to a method for improving the alcohol-repelling selectivity of NAFION membranes. Background technique [0002] A fuel cell is a high-efficiency energy utilization device that can convert the chemical energy of fuel into electrical energy, also known as an electrochemical generator. Due to the small energy loss and high conversion efficiency during the conversion of chemical energy into electrical energy when fuel cells generate electricity, there is no obvious noise in the power generation process, and almost no harmful waste is generated. It is known as the fourth-generation power generation technology. From the perspective of energy conservation and green production, fuel cells are undoubtedly the most promising power generation technology. Among them, the direct methanol fuel cell using methanol as fuel has become the most commercially successful fuel cel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1048H01M8/1088
CPCH01M8/1048H01M8/1088Y02E60/50Y02P70/50
Inventor 高明明刘子箫王新华王允坤
Owner SHANDONG UNIV
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