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Polybenzimidazole proton conducting membrane with double-network structure and preparation method thereof

A polybenzimidazole, proton conductive membrane technology, applied in circuits, fuel cells, electrical components, etc., to achieve the effects of low methanol permeability/air permeability, good mechanical properties, and uniform grid density

Inactive Publication Date: 2018-09-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a PBI-doped phosphoric acid system that also has a gel-like structure, it is undoubtedly a potential research direction to modify it by constructing a double network method. At the same time, there are no related reports in the research of fuel cell membranes at home and abroad.

Method used

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  • Polybenzimidazole proton conducting membrane with double-network structure and preparation method thereof
  • Polybenzimidazole proton conducting membrane with double-network structure and preparation method thereof
  • Polybenzimidazole proton conducting membrane with double-network structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The PBI polymer is dissolved with DMAc solvent, and the dissolution is divided into two steps: 1. First, put 3.75g PBI and 150ml DMAc in a 150ml autoclave, and then magnetically stir at 220°C for 12h to obtain a gel containing part of the PBI polymer. PBI / DMAc solution; 2. Pour the above solution into a 250ml one-necked flask, reflux at 180°C for 12 hours, so that part of the undissolved PBI can be fully dissolved. The dissolved solution was filtered several times to obtain a clear brown solution which was the PBI / DMAc solution. Take three 1ml portions of the above solution on three clean glass dishes, record the mass before evaporation, and record the mass after evaporation after the DMAc solution is completely evaporated at 100°C, so as to obtain the mass concentration of the film solution. Take the above solution in a 20ml strain bottle, ensure that the solute mass is 0.4g, dilute it with DMAc solvent to a total of 20ml, add 0.0057g of p-dichlorobenzyl (DX) and 0.011...

Embodiment 2

[0065] The PBI polymer is dissolved with DMAc solvent, and the dissolution process is the same as in Example 1. Take the above solution in a 20ml strain bottle, ensure that the solute mass is 0.4g, dilute to a total amount of 20ml with DMAc solvent, add 0.0138g of 1,4-butanediol diglycidyl ether (BDE), p-dichlorobenzyl ( DX) 0.0057g of two kinds of cross-linking agents were placed in the strain bottle, and then the solution in the strain bottle was ultrasonically dispersed for 2 hours, so that the cross-linking agent could be uniformly dispersed in the solution to obtain a film solution. Pour the above membrane solution into a 10cm×10cm glass membrane frame, put the membrane frame into an oven, adjust the level of the membrane frame, and heat it at 65°C for 6 hours, and complete the cross-linking between PBI / BDE during this process. Then raise the temperature to 90° C. and keep it warm for 12 hours to complete the cross-linking between PBI / DX, thereby obtaining a double networ...

Embodiment 3

[0067] The PBI polymer is dissolved with DMAc solvent, and the dissolution process is the same as in Example 1. Take a PBI solution containing 1g of PBI solute, add 0.0814g of p-chloromethylstyrene and 0.472g of NaH, heat up to 90°C and keep it warm for 7h, use acetone to precipitate, and use dilute hydrochloric acid to wash to obtain the p-chloromethyl of PBI Styrene graft modification. The graft modified product was dissolved in DMAc at 160° C., and the dissolution method was the same as that of PBI to obtain a PBI graft modified product solution. Take the above solution in a 20ml strain bottle, ensure that the solute mass is 0.4g, dilute it with DMAc solvent to a total of 20ml, add 0.1024g of styrene (St), 0.0954g of dibenzoyl peroxide (BPO), biphenyl Bisphenol (TM) 0.0117g, two kinds of cross-linking agents were placed in the strain bottle, and the solution in the strain bottle was ultrasonically dispersed for 2 hours, so that the cross-linking agent could be uniformly di...

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Abstract

The invention belongs to the technical field of functional materials, and particularly relates to a polybenzimidazole proton conducting membrane with a double-network structure and a preparation method thereof. By using two cross-linking agents with different reaction temperatures to perform twice crosslinking on a linear PBI under different temperature conditions, the PBI membrane which has a double-network structure and can be used for a high-temperature fuel cell proton exchanging membrane is prepared. The test shows that when the modified membrane reaches the same gelling rate, the consumption of the cross-linking agent for the double-network structural membrane is reduced by 40 to 60 percent compared with that of the single-network structural membrane; and moreover, the cross-linkinggrid density is more uniform, the methanol permeability / air permeability / phosphoric acid migration rate is lower, the mechanical performance is better after the phosphoric acid is doped, and the chemical stability and thermal stability of the double-network membrane are higher than that of the non-modified PBI membrane; and meanwhile, the proton conducting rate (the proton conducting rate is 10<2>S.cm<1> scale with the linear PBI / phosphoric acid system) and the single cell performance (the maximum power density is 350 mW.cm<2>, and the current density is 1150mA.cm<2>) are high.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a proton conductive membrane and a preparation method thereof. technical background [0002] With the continuous reduction of traditional fossil fuel reserves and the increasing environmental problems caused by the use of fossil fuels, it is an urgent need to replace traditional energy with environmentally friendly new energy. Polymer electrolyte membrane fuel cells (PEMFCs) have attracted extensive attention of researchers because of their advantages such as high energy conversion rate, high power density, low heat radiation and low emission. In a large number of research reports, polybenzimidazole (PBI) doped phosphoric acid membrane is one of the most successful high-temperature fuel cell proton exchange membrane systems, which has good thermal stability, chemical stability, fuel barrier and mechanical properties , under high phosphoric acid absorptio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/103H01M8/1072C08J5/18C08L79/04
CPCC08J5/18C08J2379/04H01M8/103H01M8/1072Y02E60/50
Inventor 浦鸿汀高海程潘昶
Owner TONGJI UNIV
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