Alkaline anion exchange composite membrane for fuel cell and preparation method thereof

An alkaline anion and fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of poor chemical stability, limit the large-scale application of proton exchange membrane fuel cells, and harsh synthesis conditions, and achieve thermal stability and High mechanical strength, preventing instability and easy decomposition, and easy control of film thickness

Active Publication Date: 2019-11-01
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Common proton exchange membranes are Nafion series membranes, which have good chemical stability, strong proton conduction ability, and excellent mechanical strength, but there are still some problems: the preparation process of the membrane is complicated, the synthesis conditions are harsh, and the precious inert metal platinum is used as the catalyst. , the battery cost is higher, and the methanol permeability is higher. Therefore, the problems of higher cost and higher methanol permeability are the biggest obstacles that limit the large-scale application of proton exchange membrane fuel cells (PEMFC).
[Chemistry ofMaterials, 2007, 19: 2686-2693] reported the preparation of polystyrene resin by copolymerization of ethylene-tetrafluoroethylene copolymer (ETFE) and p-chloromethylstyrene, using trimethylamine as the quaternizing agent Trimethylamine is grafted on the chloromethyl group in the polymer to prepare an anion exchange membrane with a conductivity of 34 mScm-l. This method improves the mechanical properties of the polymer, but this type of polymer lacks hydrophilic groups and is hydrated. The performance is poor, and the price of p-chloromethyl styrene is relatively high
Chinese patent CN102104156A discloses that polytetrafluoroethylene is used as the matrix material, benzoyl peroxide is used as the initiator, and divinylbenzene is used as the cross-linking agent to carry out quaternization reaction, and a basic anion exchange membrane is obtained after simplification. The method is simple , high efficiency, saving raw materials, but the ion conductivity of the membrane is low, and the chemical stability of the membrane is poor
Chinese patent CN101274226A discloses a method for polymer anion exchange membranes, the method includes chloromethylation of polymers, quaternization and film formation process, the method improves the ion exchange capacity and ion conductivity of the membrane, but the membrane Insufficient mechanical strength and stability
Therefore, the challenges faced by anion exchange membranes mainly lie in the low conductivity and poor stability of the membrane.

Method used

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  • Alkaline anion exchange composite membrane for fuel cell and preparation method thereof
  • Alkaline anion exchange composite membrane for fuel cell and preparation method thereof
  • Alkaline anion exchange composite membrane for fuel cell and preparation method thereof

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Embodiment 1

[0033] A method for preparing a fuel cell alkaline anion exchange composite membrane, comprising the following steps:

[0034] 1. Preparation of nano-TiO 2 : Add 2g of coarse titanium dioxide powder into 100mL of NaOH solution with a concentration of 10mol / L, stir magnetically for 30min and mix evenly. Then the above-mentioned pretreated titanium dioxide was transferred to a polytetrafluoroethylene-lined stainless steel reactor for hydrothermal reaction at 120° C. for 10 h. Then take out the reaction kettle, soak the reacted titanium dioxide in 0.1mol / L HCl solution for 2 hours, then sonicate for 60 minutes, wash with deionized water until neutral, and obtain nano-TiO 2 .

[0035] 2. TiO2 2 / Preparation of PVA spinning solution: Dissolve PVA powder in deionized water, heat and magnetically stir at 90°C for 2 hours to obtain a PVA stock solution with a mass fraction of 5%, and take nano-TiO 2 Uniformly dispersed into PVA solution to obtain TiO 2 The mass fraction is 1% TiO...

Embodiment 2

[0040] A method for preparing a fuel cell alkaline anion exchange composite membrane, comprising the following steps:

[0041] 1. Preparation of nano-TiO 2 : Add 2g of coarse titanium dioxide powder into 100ml of NaOH solution with a concentration of 10mol / L, and stir magnetically for 30min to mix evenly. Then the above-mentioned pretreated titanium dioxide was transferred to a polytetrafluoroethylene-lined stainless steel reactor, and reacted at 200° C. for 12 hours. Then take out the reactor, soak the reacted titanium dioxide in 0.1mol / L HCl for 2h, then ultrasonicate for 60min, wash with deionized water until neutral, and obtain TiO 2 Nanoparticles.

[0042] 2. TiO2 2 / Preparation of PVA spinning solution: Dissolve PVA powder in deionized water, heat and magnetically stir at 90°C for 2 hours to obtain a PVA stock solution with a mass fraction of 5%, and take nano-TiO 2 Uniformly dispersed into PVA solution to obtain TiO 2 The mass fraction is 1% TiO 2 / PVA spinning so...

Embodiment 3

[0047] A preparation method of an alkaline anion exchange composite membrane material for a fuel cell, comprising the following steps:

[0048] 1. Preparation of nano-TiO 2 : Add 2g of coarse titanium dioxide powder into 100ml of NaOH solution with a concentration of 10mol / L, and stir magnetically for 30min to mix evenly. Then the above-mentioned pretreated titanium dioxide was transferred to a polytetrafluoroethylene-lined stainless steel reactor, and reacted at 180° C. for 15 hours. Then take out the reactor, soak the reacted titanium dioxide in 0.1mol / L HCl for 2h, then ultrasonicate for 60min, wash with deionized water until neutral, and obtain TiO 2 Nanoparticles.

[0049] 2. TiO2 2 / Preparation of PVA electrospinning solution: Dissolve PVA powder in deionized water, heat and magnetically stir at 90° C. for 2 hours to obtain a PVA stock solution with a mass fraction of 10%. Take a certain amount of nano-TiO 2 , uniformly dispersed into the PVA solution to obtain TiO ...

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Abstract

The invention discloses an alkaline anion exchange composite membrane for a fuel cell and a preparation method. The composite membrane is prepared through the following steps that the electrostatic spinning technology is adopted for preparing a TiO2 / PVA composite membrane, the best TiO2 / PVA membrane is adopted as a base material, a quaternary amine perssad is introduced into the TiO2 / PVA membrane through quaternary amination, alkalization and other reactions, meanwhile, dissolved bacterial cellulose is adopted for casting the composite membrane for solving the problem of fuel leakage in the cell operation process, and the alkaline anion exchange composite membrane is prepared. The bacterial cellulose material is adopted to coat the exchange membrane, the problem of leakage of anode and cathode gas produced in the cell using process can be solved, and due to the fact that the bacterial cellulose material is high in Young modulus, strong in moisturizing property and high in thermal stability and mechanical strength, and the problem that ion exchange membrane is not stable and easy to decompose in the operation process is effectively solved. The alkaline anion exchange composite membrane prepared through the method improves the electrochemical performance and the mechanical strength.

Description

technical field [0001] The invention belongs to the field of alkaline anion exchange membrane materials for fuel cells, in particular to an alkaline anion exchange composite membrane for fuel cells and a preparation method. Background technique [0002] Fuel cells have the advantages of high efficiency, low noise, no pollution, various fuels, long life, and high flexibility, and have attracted widespread attention at home and abroad. Among all fuel cells, proton exchange membrane fuel cells are the fastest-growing type of fuel cells in recent years because of their high energy conversion efficiency, high specific power, environmental friendliness, and low operating temperature. Common proton exchange membranes are Nafion series membranes, which have good chemical stability, strong proton conduction ability, and excellent mechanical strength, but there are still some problems: the preparation process of the membrane is complicated, the synthesis conditions are harsh, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1069H01M8/1081H01M8/1072H01M8/1025H01M8/1041
CPCH01M8/1025H01M8/1055H01M8/1069H01M8/1072H01M8/1081Y02E60/50
Inventor 代北北胡家佳陈兵
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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