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Method for reducing electrochemical degradation of proton exchange membrane

A proton exchange membrane, electrochemical technology, used in electrochemical generators, circuits, fuel cells, etc.

Inactive Publication Date: 2018-11-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above methods mainly focus on the inhibition of free radical production without quenching the free radicals produced

Method used

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  • Method for reducing electrochemical degradation of proton exchange membrane
  • Method for reducing electrochemical degradation of proton exchange membrane
  • Method for reducing electrochemical degradation of proton exchange membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Part of the solvent of the 5wt% Nafion solution was evaporated to prepare a 20wt% Nafion solution. Dissolve 1g of SPEEK in 3g of dimethylacetamide, add 1.25g of 20wt% Nafion solution, and stir until completely dissolved at room temperature to make a SPEEK / Nafion solution (mass ratio SPEEK:Nafion=4:1). Take a certain amount of SPEEK / Nafion solution, and then add CeO with a final mass fraction of 0.5wt% 2 powder, where CeO 2 The average particle size is 14 nanometers, mixing and stirring for 2 hours, ultrasonication for 1 hour, and standing at room temperature for 5 hours to remove air bubbles, so as to avoid defects in the film formation process and prepare CeO 2 / Casting solution of ion exchange resin. Put the prepared casting solution on a horizontal glass plate with a size of 9×11 cm, and dry it in a drying oven at 80°C for 24 hours.

[0028] Using the same method as above, the difference is that the free radical quencher CeO is not added 2 , to prepare PEM witho...

Embodiment 2

[0030] Preparation of casting solution slurry: Weigh 0.2244g of dry SPBI resin and dissolve it in 18g of N-methylpyrrolidone (NMP) solvent, stir until SPBI is completely dissolved, and filter to remove impurities. Then add mass fraction 2wt% CeO 2 powder, where CeO 2 The average particle size of the nanoparticles is 7 nanometers, mixing and stirring for 2 hours, ultrasonication for 1 hour, and standing at room temperature for 5 hours to remove air bubbles to obtain SPBI-CeO 2 Casting solution. Cast the casting solution onto a horizontal glass plate with a size of 9×11 cm, and dry it in a drying oven at 100°C for 24 hours. Get CeO 2 The loading is 2wt% SPBI-CeO 2 Composite film.

[0031] Using the same method as above, the difference is that the free radical quencher CeO is not added 2 , to prepare a proton exchange membrane without adding a free radical quencher——SPBI. The two prepared films were tested for their antioxidant properties in Fenton's reagent, such as ima...

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Abstract

The invention relates to a method for reducing electrochemical degradation of a proton exchange membrane. According to the method, a free radical quenching agent is added into the proton exchange to prepare an organic / inorganic composite proton exchange membrane, and the electrochemical stability of the membrane is improved on the premise that high conductivity of the proton exchange membrane is ensured. The composite membrane shows relatively good stability in a fuel cell and a polymer electrolyte hydrolysis tank.

Description

technical field [0001] The invention belongs to the technical field of ion exchange resins, in particular to a method for slowing down the electrochemical degradation of proton exchange membranes. Background technique [0002] As a functional polymer with high ionic conductivity and chemical stability, proton exchange membrane (PEM) has been widely used in the field of energy storage and conversion. Among them, fuel cells and polymer electrolyte (SPE) water electrolysis cells are typical representatives of the successful use of proton exchange membranes in the field of new energy. Due to its high energy conversion efficiency, high specific power, and environmental friendliness, fuel cells have broad application prospects in vehicle power supplies and mobile power supplies; and SPE water electrolysis hydrogen production technology, compared with traditional fossil fuel hydrogen production , has the advantages of mild operating conditions, fast response and stable performance...

Claims

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Application Information

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IPC IPC(8): H01M10/42
CPCH01M8/1016H01M10/4235Y02E60/10Y02E60/50
Inventor 俞红梅高学强迟军贾佳覃博文邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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