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Membrane electrode assembly comprising self-crosslinking ionic polymer and method for preparing same

A membrane electrode assembly, ionic polymer technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of rapid reduction of fuel cell voltage, rapid reduction of battery voltage, etc., to improve operating efficiency and stability, and improve uniformity. and stable, improved uniformity

Active Publication Date: 2021-11-26
广东碳中和研究院(韶关)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During start-up and shutdown operations, air is easy to diffuse to the anode, causing the voltage of single or multiple fuel cells in the stack to drop rapidly or even become negative; in addition, the insufficient hydrogen supply of fuel cells due to various factors can also easily lead to battery The voltage drops rapidly or even the voltage becomes negative

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of membrane electrode assembly comprises the following steps:

[0029] 1) the CF 2 = CFOCF 2 (CF 2 ) 2 SO 2 F’s homopolymer resin and carbon-supported platinum catalyst were ultrasonically dispersed in a mixed solvent of N,N-dimethylformamide, isopropanol and water (2:1:1 by volume), and then passed through ammonia gas to make the whole The sulfonyl fluoride groups in the fluorosulfonyl fluoride resin are converted into sulfonamide groups to form a precursor dispersion.

[0030] 2) Add CF to the precursor dispersion prepared in step 1) 2 = CFOCF2 (CF 2 ) 2 SO 2 The dimer of F and trimethylamine were heated by microwave for 90 minutes at a frequency of 1.5 GHz and an output power of 800 W to cause a crosslinking reaction of the homopolymer resin, and then adjust the pH of the reaction solution to 4 to make the protons of the sulfonyl groups to obtain the catalytic layer dispersion; CF 2 = CFOCF 2 (CF 2 ) 2 SO 2 The mass ratio of the d...

Embodiment 2

[0033] The preparation method of fuel cell anode catalyst layer comprises the following steps:

[0034] 1) the CF 2 = CFOCF 2 (CF 2 ) 3 SO 2 F's homopolymer resin and carbon-supported platinum catalyst were ultrasonically dispersed in a mixed solvent of dimethyl sulfoxide, isopropanol and water (1.5:1:1 by volume), and then passed through ammonia gas to make the perfluorosulfonyl fluoride resin The sulfonyl fluoride group in the catalyst is converted into a sulfonamide group to form a precursor dispersion.

[0035] 2) Add CF to the precursor dispersion prepared in step 1) 2 = CFOCF 2 (CF 2 ) 3 SO 2 The dimer of F and triethylamine were heated by microwave for 60 minutes at a frequency of 2 GHz and an output power of 1500 W to cause a crosslinking reaction of the homopolymer resin, and then adjust the pH of the reaction solution to 4.5 to make the protons of the sulfonyl groups to obtain the catalytic layer dispersion; CF 2 = CFOCF 2 (CF 2 ) 3 SO 2 The mass ratio...

Embodiment 3

[0038] The preparation method of fuel cell anode catalyst layer comprises the following steps:

[0039] 1) the CF 2 = CFOCF 2 (CF 2 ) 2 SO 2 F’s homopolymer resin and carbon-supported platinum catalyst were ultrasonically dispersed in a mixed solvent of N,N-dimethylformamide, isopropanol and water (2:1:1 by volume), and then passed through ammonia gas to make the whole The sulfonyl fluoride groups in the fluorosulfonyl fluoride resin are converted into sulfonamide groups to form a precursor dispersion.

[0040] 2) Add CF to the precursor dispersion prepared in step 1) 2 = CFOCF 2 (CF 2 ) 2 SO 2 The dimer of F and trimethylamine were heated by microwave for 90 minutes at a frequency of 1.5 GHz and an output power of 800 W to cause a crosslinking reaction of the homopolymer resin, and then adjust the pH of the reaction solution to 4 to make the protons of the sulfonyl groups and then add the tripeptide to obtain the catalytic layer dispersion; CF 2 = CFOCF 2 (CF 2 )...

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PUM

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Abstract

The invention provides a membrane electrode assembly, the preparation method of which comprises: 1) uniformly dispersing a catalyst, a conductive carbon material and a perfluorosulfonyl fluoride resin in a solvent, feeding ammonia gas to form a precursor dispersion; The fluororesin is a homopolymer of perfluorovinyl ether whose end group is a sulfonyl fluoride group; 2) adding a dimer of a perfluorovinyl ether whose end group is a sulfonyl fluoride group to the precursor dispersion and Trimethylamine or triethylamine, microwave treatment causes perfluorosulfonyl fluoride resin to undergo crosslinking reaction, then adjusts the pH of the reaction solution to 3-5 to obtain a catalytic layer dispersion; 3) Apply the catalytic layer dispersion to the polymer electrolyte membrane On the catalyst coating film, the catalyst coating film is sandwiched between two sheets of carbon paper to form a membrane electrode assembly. The membrane electrode assembly of the invention has better uniformity and stability of the catalytic layer.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a membrane electrode assembly containing a self-crosslinked ionic polymer and a preparation method thereof. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy through an electrochemical reaction. It has the advantages of clean and pollution-free, high energy conversion efficiency, and high energy density. It has broad application prospects in transportation, signal base stations, and other fields. [0003] The core components of a fuel cell mainly include a membrane electrode assembly (MEA) and a bipolar plate. The MEA is composed of a polymer electrolyte membrane with an anode catalyst layer and a cathode catalyst layer on both sides and a gas diffusion layer. The bipolar plate includes an anode plate and a cathode plate, the anode plate and the cathode plate are respectively provided with flow chann...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1004H01M4/88H01M4/92H01M4/86
CPCH01M4/8668H01M4/8825H01M4/926H01M8/1004Y02E60/50
Inventor 张维项君君
Owner 广东碳中和研究院(韶关)