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Preparation of novel polyphosphazene alkaline membrane

A polyphosphazene and alkaline membrane technology, which is applied to fuel cell parts, structural parts, battery pack parts, etc., can solve the problems of slow electrode kinetic reaction, hindering the industrialization process, and high cost of fuel cells, achieving The effect of good ion conductivity, good thermochemical stability and good mechanical properties

Inactive Publication Date: 2012-09-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Nafion membrane also has some disadvantages, such as: the kinetic reaction of the electrode in an acidic environment is slow, and the electrode catalyst uses noble metal platinum, resulting in high cost for its use in fuel cells, which hinders the industrialization process

Method used

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  • Preparation of novel polyphosphazene alkaline membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Preparation of Poly(p-methylphenoxyphosphazene) Alkaline Membrane

[0043] 1) Preparation of quaternary phosphonium poly-p-methylphenoxyphosphazene film

[0044] To 0.5g of brominated poly-p-methylphenoxyphosphazene in 20mL of tetrahydrofuran solution, add dropwise excess triphenylphosphine in 20mL of tetrahydrofuran solution, and stir at 10-90°C for 1-7h to obtain a light yellow precipitate, which is the quaternary Phosphonium poly(p-methylphenoxyphosphazene). Dissolve it in 5mL of N,N-dimethylformamide solution, ultrasonically dissolve and defoam, then cast at 20-120°C for 12-60h to form a film.

[0045] 2) Preparation of poly-p-methylphenoxyphosphazene basic membrane

[0046] The above-mentioned quaternary phosphonium poly-p-methylphenoxyphosphazene film was mixed in 1mol L -1 Soak in KOH solution for 48 hours for ion exchange, and then wash with deionized water to obtain a light yellow film, which is the poly-p-methylphenoxyphosphazene basic film.

Embodiment 2

[0048] Preparation of Poly(p-methylphenoxyphosphazene) Crosslinked Alkaline Membrane

[0049] 1) Preparation of quaternary phosphonium poly(p-methylphenoxyphosphazene) crosslinked membrane

[0050] To 0.5g of brominated poly-p-methylphenoxyphosphazene in 20mL of tetrahydrofuran solution, drop a certain mass ratio of triphenylphosphine and polyethylene glycol (200) sodium in 30mL of tetrahydrofuran solution, at 10~90℃ , Stirring for 1-7h, a light yellow precipitate was obtained, which was cross-linked quaternary phosphonium poly-p-methylphenoxyphosphazene. Dissolve it in 5mL of N,N-dimethylformamide solution, ultrasonically dissolve and defoam, then cast at 20-120°C for 12-60h to form a film.

[0051] 2) Preparation of poly-p-methylphenoxyphosphazene crosslinked alkaline membrane

[0052] The above-mentioned quaternary phosphonium poly-p-methylphenoxyphosphazene cross-linked film was mixed in 1mol L -1 Soak in KOH solution for 48 hours for ion exchange, and then wash with de...

Embodiment 3

[0054] Preparation of poly-p-methylphenoxyphosphazene blend alkaline membrane

[0055] 1) Preparation of quaternary phosphonium poly(p-methylphenoxyphosphazene) blend film

[0056] To 0.5g of brominated poly-p-methylphenoxyphosphazene in 20mL of tetrahydrofuran solution, add dropwise excess triphenylphosphine in 20mL of tetrahydrofuran solution, and stir at 10-90°C for 1-7h to obtain a light yellow precipitate, which is the quaternary Phosphonium poly(p-methylphenoxyphosphazene). Dissolve it in 5mL of N,N-dimethylformamide solution, add a certain amount of polyethylene glycol (200) dropwise, ultrasonically dissolve and defoam, then cast at 20-120°C for 12-60h to form a film.

[0057] 2) Preparation of poly-p-methylphenoxyphosphazene blended alkaline membrane

[0058] The above-mentioned quaternary phosphonium poly-p-methylphenoxyphosphazene blend film was mixed in 1mol L -1 Soak in KOH solution for 48 hours for ion exchange, and then wash with deionized water to obtain a li...

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Abstract

The invention provides a preparation method of a novel polyphosphazene alkaline membrane for a fuel cell. The preparation method of the polyphosphazene alkaline membrane comprises the following steps of: performing a quaternary phosphatization reaction on polyphosphazene loaded with benzyl bromide or alkyl bromide at the tail end of a branch chain and a quaternary phosphatization reagent to obtain quaternary phosphatization polyphosphazene; dissolving into an organic solvent, and performing curtain coating and membrane forming; and soaking with an alkaline liquor, wherein triaryl phosphine or trialkyl phosphine can be taken as the quaternary phosphatization reagent. A preparation method of a polyphosphazene crosslinked alkaline membrane comprises the following steps of: doping a crosslinking agent into the quaternary phosphatization reagent; reacting with polyphosphazene loaded with benzyl bromide or alkyl bromide at the tail end of a branch chain to obtain crosslinked quaternary phosphatization polyphosphazene; dissolving into an organic solvent, and performing curtain coating and membrane forming; and soaking with an alkaline liquor, wherein the crosslinking agent can be a polyethylene glycol sodium salt or diamine. A preparation method of a polyphosphazene coblended alkaline membrane comprises the following steps of: doping a polyalcohol into quaternary phosphatization polyphosphazene; performing curtain coating and membrane forming; and soaking with an alkaline liquor, wherein the polyalcohol can be polyethylene glycol or polyvinyl alcohol.

Description

technical field [0001] The invention belongs to the field of preparation of alkaline membranes for fuel cells, in particular to the preparation of novel polyphosphazene alkaline membranes, polyphosphazene crosslinked alkaline membranes and polyphosphazene blended alkaline membranes. Background technique [0002] Fuel cells (Fuel cells) are power generation devices that directly convert the chemical energy of fuel into electrical energy through electrochemical reactions. It is a promising chemical power source in the 21st century. Taking the alkaline membrane hydrogen-oxygen fuel cell as an example, its working principle and electrochemical reaction are as follows, the anode: 2H 2 +4OH - →4H 2 O+4e - ; Cathode: O 2 +2H 2 O+4e - →4OH - ;Total battery response: 2H 2 +O 2 →2H 2 O+electric energy+heat, OH - Conduction from the cathode to the anode through the alkaline membrane participates in the electrode reaction, and also plays a role in blocking fuel. It can be se...

Claims

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Application Information

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IPC IPC(8): C08J7/00C08J5/22C08J3/24C08L85/02C08G79/02H01M2/16H01M8/02C08G79/025H01M8/0239
CPCY02E60/50
Inventor 汪中明张婷韩克飞朱红
Owner BEIJING UNIV OF CHEM TECH
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