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Method for effectively improving ionic conductivity of perfluorosulfonate membrane

A technology of perfluorosulfonic acid membrane and ionic conductivity, which is applied in fuel cell parts, circuits, electrical components, etc., can solve the problems of high price, poor high temperature resistance, and limited promotion of Nafion membrane, and reduce resistance , post-processing convenience, the effect of improving ion conductivity

Inactive Publication Date: 2016-08-31
NINGBO TOOPU BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high price of Nafion membrane, methanol leakage, poor high temperature resistance and other reasons have greatly limited its promotion. In view of these defects of Nafion membrane, researchers have carried out organic and inorganic doping or blending measures on Nafion membrane. modify

Method used

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  • Method for effectively improving ionic conductivity of perfluorosulfonate membrane
  • Method for effectively improving ionic conductivity of perfluorosulfonate membrane
  • Method for effectively improving ionic conductivity of perfluorosulfonate membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The preparation of embodiment 1SGO

[0022] Add 20 mL of 3% NaOH solution and 0.3 g of p-aminobenzenesulfonic acid (SA) into a 100 mL beaker, and dissolve 0.3 g of SA in a warm water bath. Then add 0.06g NaNO to the above solution at room temperature 2 , when NaNO 2 After dissolving in the mixed solution, the solution was poured into 20 mL of ice water containing 1 mL of concentrated HCl under stirring condition, and the temperature was kept in the ice water bath for 30 min, and then the aryl diazonium salt was formed. The aryl diazonium salt solution prepared above was added dropwise into GO aqueous solution containing 250 mg GO, and the mixed solution was reacted in a water bath at 15 °C for 14 h. Then it was separated by centrifugation, washed with deionized water until neutral, and then freeze-dried.

Embodiment 2

[0023] The preparation of embodiment 2SGO / Nafion composite membrane

[0024] 1.1 Preparation of Nafion / DMF solution

[0025] Evaporate the solvent from the Nafion solution at 80°C to obtain a Nafion solid, which is formulated into a 0.04g / mL solution, and dispersed evenly by ultrasonication at a frequency of 70HZ and a temperature of 65°C.

[0026] 1.2 Preparation of SGO / DMF solution

[0027] The sulfonated graphene oxide SGO obtained after freeze-drying in the above experiments was dissolved in DMF to prepare a 0.03 g / mL solution, and then dispersed evenly by ultrasonic at a frequency of 70 Hz and a temperature of 65 °C.

[0028] 1.3 SGO / Nafion composite membrane

[0029] According to the quality of the contained SGO, mix the above-mentioned Nafion / DMF solution and SGO / DMF solution to prepare mixed membrane solutions with ratios of 0%, 1%, 3%, 5%, and 8%, and disperse them uniformly by ultrasonic at a frequency of 70HZ , the temperature is 65°C, the mixed dispersion is pou...

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Abstract

The invention discloses a method for effectively improving the ionic conductivity of a perfluorosulfonate membrane. According to the method, sulfonated graphene (SGO) is doped in the perfluorosulfonate membrane (Nafion), an SGO / Nafion composite membrane is prepared, and thus the ionic conductivity of the perfluorosulfonate membrane is improved. Due to the addition of the synthesized SGO, the water absorption rate, the swelling degree and the ionic conductivity of the SGO / Nafion composite membrane are remarkably increased; the water absorption rate is increased to be 89% of the composite membrane from 30% of a pure Nafion membrane; the swelling degree is increased to be 142% of the composite membrane from 75% of the pure Nafion membrane; the ionic conductivity of the pure Nafion membrane is 57.89Ms.cm<-1>; along with the increasing of the content of SGO, the ionic conductivity of the composite membrane can be gradually improved, the highest ionic conductivity of the Nafion-8%-SGO is 125.70Ms.cm<-1>, which is more than two times that of the pure Nafion membrane.

Description

technical field [0001] The present invention relates to a method for effectively improving the ionic conductivity of perfluorosulfonic acid membranes, especially the method of doping sulfonated graphene (SGO) in perfluorosulfonic acid membranes (Nafion) to prepare SGO / Nafion composite membranes , to improve the ionic conductivity of the Nafion membrane. Background technique [0002] In recent decades, fuel cells have become the focus of researchers' research. Because of their advantages of zero emission, environmental friendliness, high energy conversion efficiency, good durability, and high specific energy, they are ideal energy devices that can effectively solve environmental problems. and the energy crisis. As the core component of the fuel cell, the proton exchange membrane has also attracted the attention of many scientific researchers. How to improve its comprehensive performance and further improve the performance of the fuel cell has always been a difficult problem ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/02H01M2/16H01M50/409
CPCH01M8/02H01M50/409Y02E60/50Y02E60/10
Inventor 郑洁刘望才蒋仲庆王珊
Owner NINGBO TOOPU BIOTECH
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