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Perfluorosulfonic acid/coupled phosphotungstic acid lignin coating liquid, ion exchange membrane and preparation method thereof

An ion-exchange membrane and perfluorosulfonic acid technology, which is applied in the field of perfluorosulfonic acid/coupled phosphotungstic acid lignin coating liquid, can solve the problem of increasing the overall size and weight, easy dehydration of PFSA membrane, and decreased proton conductivity. Problems, achieve the effect of improving stability and life, low price, and improving water retention

Pending Publication Date: 2021-12-21
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the proton conductivity of commercial PFSA membranes depends largely on the water content, and PFSA membranes are prone to dehydration at high temperatures, which affects the stability of batteries.
That is, the proton conductivity of the PFSA membrane decreased under high temperature and low humidity conditions, causing H 2 -O 2 Increased ohmic resistance of proton exchange membrane fuel cells leading to rapid degradation of cell performance
The use of external humidification equipment is a common way to solve the problem of the decline of proton conductivity of commercial PFSA membranes under high temperature and low humidity conditions, but it increases the H 2 -O 2 The overall size and weight of the PEMFC system, while also exacerbating the energy loss

Method used

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  • Perfluorosulfonic acid/coupled phosphotungstic acid lignin coating liquid, ion exchange membrane and preparation method thereof
  • Perfluorosulfonic acid/coupled phosphotungstic acid lignin coating liquid, ion exchange membrane and preparation method thereof
  • Perfluorosulfonic acid/coupled phosphotungstic acid lignin coating liquid, ion exchange membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Embodiment 1 provides a preparation method of polytetrafluoroethylene / perfluorosulfonic acid / coupled phosphotungstic acid lignin ion exchange membrane, the specific steps are as follows:

[0058] Preparation of coupling agent modified lignin: adding lignin and 3-aminopropyltriethoxysilane with a mass ratio of 1:1 to a mixed solution of deionized water and ethanol with a volume ratio of 1:9 (wood The mass volume ratio of the element and the coupling agent in the mixed solution of deionized water and ethanol is 1 / 50g / mL), reacted at 30°C and 1000r / min stirring speed for 12h, after the reaction, washed with deionized water The reaction product was repeatedly centrifuged and washed, put in an oven at 60°C, and dried for 24 hours to obtain coupling agent-modified lignin; preparation of coupling phosphotungstic acid lignin: add the above-mentioned coupling agent-modified lignin to 10wt% phosphorus In tungstic acid aqueous solution (the ratio of the mass of coupling agent-modi...

Embodiment 2

[0068] Example 2, a preparation method of polytetrafluoroethylene / perfluorosulfonic acid / coupled phosphotungstic acid lignin ion exchange membrane, the only difference from Example 1 is: coupling phosphotungstic acid lignin and perfluorosulfonic acid The mass ratio of resin is 1:100.

[0069] The polytetrafluoroethylene / perfluorosulfonic acid / coupled phosphotungstic acid lignin ion exchange membrane prepared in Example 2 has a thickness of 11 μm, which is too thin to easily cause fuel permeation, which is worse than the membrane prepared in Example 1, which is not conducive to the battery long run. Compared with the ion exchange membrane prepared in Example 1, the ion exchange membrane prepared in Example 2 is not conducive to the commercial application of proton exchange membrane fuel cells. The ion-exchange membrane prepared in Example 2 has a uniform and dense texture, no porous polytetrafluoroethylene film, no dissolution phenomenon of coupled phosphotungstic acid lignin,...

Embodiment 3

[0071] Example 3, a preparation method of polytetrafluoroethylene / perfluorosulfonic acid / coupled phosphotungstic acid lignin ion exchange membrane, the only difference from Example 1 is: coupling phosphotungstic acid lignin and perfluorosulfonic acid The mass ratio of resin is 1:10.

[0072] The polytetrafluoroethylene / perfluorosulfonic acid / coupled phosphotungstic acid lignin ion-exchange membrane prepared in Example 3 has a thickness of 23 μm, and the ion-exchange membrane prepared in Example 3 has a uniform texture, but it is different from that prepared in Example 1. Compared with the ion-exchange membrane, the ion-exchange membrane prepared in Example 3 has the phenomenon of coupled phosphotungstic acid lignin agglomeration, and is not suitable for application in proton exchange fuel cells.

[0073] Water absorption, tensile strength and proton conductivity were tested on the polytetrafluoroethylene / perfluorosulfonic acid / coupled phosphotungstic acid lignin ion exchange m...

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Abstract

The invention discloses perfluorosulfonic acid / coupled phosphotungstic acid lignin coating liquid, an ion exchange membrane and a preparation method thereof. The preparation raw materials of the perfluorosulfonic acid / coupled phosphotungstic acid lignin coating liquid comprise coupled phosphotungstic acid lignin, perfluorosulfonic acid resin and a solvent, wherein the mass ratio of the coupled phosphotungstic acid lignin to the perfluorinated sulfonic acid resin is (0.1-15): 100. The coupled phosphotungstic acid lignin has the advantages of good dispersity, good hydrophilicity, high proton conductivity and the like, a proton transfer channel is easily regulated and controlled from the molecular scale, rapid proton transfer can be realized, meanwhile, the water retention rate of the perfluorosulfonic acid exchange membrane under high-temperature and low-humidity conditions is increased, and the industrialization development of proton exchange membrane fuel cells is promoted.

Description

technical field [0001] The invention relates to the technical field of ion exchange membranes, in particular to perfluorosulfonic acid / coupled phosphotungstic acid lignin coating liquid, ion exchange membranes and a preparation method. Background technique [0002] h 2 -O 2 Proton exchange membrane fuel cells have the advantages of rapid response, high energy conversion efficiency, high power density and zero pollutant emissions, and are considered to be one of the most promising alternative power sources for stationary power sources and automotive power sources. [0003] Ion exchange membranes need to have high proton conductivity, good stability and low fuel permeability. h 2 -O 2 The perfluorosulfonic acid ion exchange resin (PFSA) membrane commonly used in proton exchange membrane fuel cells has the advantages of high proton conductivity, good chemical stability and thermal stability. However, the proton conductivity of commercial PFSA membranes depends largely on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1041H01M8/1046H01M8/1069H01M8/1072
CPCH01M8/1041H01M8/1046H01M8/1069H01M8/1072Y02E60/50
Inventor 叶家业郑春花李慧云欧阳惠颖孙天夫刘艳琳
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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