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Composite polyepoxy chloropropane alkaline polymer membrane electrode and preparation method thereof

A polyepichlorohydrin, polymer film technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of AAEM's poor high temperature resistance, poor chemical stability, low mechanical strength, etc., to avoid limited contact interface, The preparation method is simple and the effect of improving the conductivity

Inactive Publication Date: 2013-02-27
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One of the main reasons is the lack of an anion exchange membrane (AAEM) suitable for fuel cells, due to the OH - The migration rate is less than H + 1 / 4 of that of AAEM, the conductivity of AAEM is lower than that of PEM; AAEM has poor high temperature resistance, and most of them degrade at ≥60°C; poor chemical stability and low mechanical strength
Another main reason is the lack of electrodes suitable for alkaline solid electrolytes. Hydrophobic electrodes in traditional alkaline fuel cells and acidic system electrodes in proton exchange membrane fuel cells are not suitable for AAEMFC

Method used

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  • Composite polyepoxy chloropropane alkaline polymer membrane electrode and preparation method thereof
  • Composite polyepoxy chloropropane alkaline polymer membrane electrode and preparation method thereof
  • Composite polyepoxy chloropropane alkaline polymer membrane electrode and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Polyepichlorohydrin (PECH) was dissolved in N,N-dimethyl sulfoxide (DMSO), heated with stirring, to a temperature of 100 °C; under an inert atmosphere, 30% N, N,N`,N`-tetramethyl-1,6-ethylenediamine was reacted for 48 hours. After the reaction was completed, the solution was removed, filtered and used for later use to obtain quaternized polyepichlorohydrin (QPECH); to the above homogeneous solution Add a certain amount of ethanol and acetone, stir for 2 hours to form a 14% uniform film-forming solution; cast the film-forming solution into the pretreated porous PTFE film, heat at 60 °C to evaporate the solvent, and at 100 °C After 12 hours of vacuum heat treatment, the desired anion exchange membrane was obtained.

[0041] The carbon paper was treated with polytetrafluoroethylene (PTFE) emulsion and sintered, firstly sintered at 120 °C for 15 min, and then at 350 °C for 15 min; then a certain amount of carbon powder and polyperfluoroethylene propylene (FEP) emulsion were...

Embodiment 2

[0046] The preparation process of the anion exchange membrane is as described in Example 1, except that the tertiary amine is N,N,N',N'-tetramethyl-1,6-hexanediamine. Thermogravimetric analysis tests were performed on polyepichlorohydrin (PECH), synthetic quaternized polyepichlorohydrin (QPECH), prepared anion exchange membranes (QPECH / PTFE), such as figure 1 As shown in the figure, the prepared anion exchange membrane (QPECH / PTFE) has a decomposition temperature greater than 200 °C, has good thermal stability, and can meet the needs of low-temperature fuel cell operation (the working temperature is generally lower than 120 °C); The ionic conductivity of the exchange membrane was tested by testing such as figure 2 As shown, the prepared anion exchange membrane has high ionic conductivity, and the highest ionic conductivity is greater than 10 -2 S cm -1 (Currently the advanced level of anion exchange membranes is 10 -2 magnitude).

[0047] The preparation process of the g...

Embodiment 3

[0051] The membrane electrode in Example 2 was applied to the fuel cell, and the polarization characteristic curve test was carried out. The intake air metering ratio is 2.0. Test results such as image 3 It shows that the prepared composite polyepichlorohydrin alkaline polymer membrane electrode exhibits good electrical performance of alkaline fuel cells, the battery open circuit voltage is greater than 1.0V, and the maximum power density is 16.4 mW cm -2 . This example is the application of the prepared membrane electrode in a fuel cell. The electrochemical performance of the fuel cell is expressed by the polarization curve. The results show that the prepared membrane electrode can operate normally in the fuel cell; Compared with the performance of membrane fuel cells, the performance is relatively good.

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Abstract

The invention discloses a composite polyepoxy chloropropane alkaline polymer membrane electrode and a preparation method thereof. The membrane electrode comprises an alkaline anion-exchange membrane and an electrode layer, wherein the alkaline anion-exchange membrane is prepared by the following steps: carrying out nucleophilic substitution reaction on halogen atom and tertiary amine to obtain quaternized polyepoxy chloropropane, and compounding with a porous polytetrafluoroethylene membrane; the electrode layer comprises a hydrogen electrode and an oxygen electrode, the hydrogen electrode comprises a gas diffusion layer and a hydrogen electrode catalytic layer sprayed on the gas diffusion layer, and the oxygen electrode comprises a gas diffusion layer and an oxygen electrode catalytic layer sprayed on the gas diffusion layer; the membrane electrode is integrally formed according to the combination sequence of the hydrogen electrode, the alkaline anion-exchange membrane and the oxygen electrode; and the gas diffusion layer is formed by adding hydrophobic polymer to the matrix carbon material. The alkaline membrane electrode disclosed by the invention has the advantages of simple synthesis method of the alkaline anion-exchange membrane, and high ionic conductivity, can adopt a low-cost non-platinum-based catalyst, and is suitable for alkaline anion-exchange membrane fuel batteries.

Description

technical field [0001] The invention belongs to the field of fuel cells, and relates to a membrane electrode, in particular to a composite polyepichlorohydrin alkaline polymer membrane electrode for a fuel cell and a preparation method thereof. Background technique [0002] Alkaline fuel cell (AFC) is the first practical fuel cell, and its biggest advantage lies in the superior redox kinetics of the cathode, which can use low-load Pt catalysts or even non-Pt catalysts. Its working principle is that under the action of the electrocatalyst, the anode hydrogen and hydroxide ions undergo an oxidation reaction to generate water and electrons, and the electrons are conducted to the cathode through an external circuit. Under the action of the cathode catalyst, they react with oxygen and water to form hydrogen and oxygen. The generated hydroxide ions migrate through the electrolyte to the anode to continue to participate in the reaction. However, the traditional alkaline fuel cell ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88H01M4/90
CPCY02E60/50
Inventor 朱荣杰王涛张伟刘向孙毅张新荣
Owner SHANGHAI INST OF SPACE POWER SOURCES
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