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An ordered gas diffusion electrode and its preparation and application

A gas diffusion electrode and gas diffusion layer technology, which is applied in battery electrodes, circuits, electrical components, etc., can solve the problems of catalytic layer stability and poor material transfer performance, and achieve improved oxygen reduction capacity per unit mass and excellent stability. , The effect of excellent mass transfer performance

Active Publication Date: 2016-08-03
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods reported in the literature usually use direct self-assembly on the surface of disordered carbon supports, and the stability of the catalytic layer at high potentials and poor material transfer performance

Method used

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  • An ordered gas diffusion electrode and its preparation and application
  • An ordered gas diffusion electrode and its preparation and application
  • An ordered gas diffusion electrode and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Preparation of gas diffusion layer:

[0039] Soak Toray carbon paper in 20% PTFE aqueous solution, take it out and air dry after fully soaking, and weigh it. Repeat the above steps until the PTFE loading is about 15% (the mass of carbon paper after hydrophobization treatment). Mix VulcanXC-72 carbon powder with 20% PTFE aqueous solution at a mass concentration of 10% relative to the mass of carbon powder and PTFE, and dilute with ethanol 20 times the mass of carbon powder, disperse under ultrasonic conditions for 20 minutes, and stir evenly. The above-mentioned hydrophobized carbon paper was placed on a glass plate and fixed, and the above-mentioned slurry was scraped on the surface of the carbon paper, and weighed until the carbon powder loading was 1mgcm -2 , that is, the gas diffusion layer is obtained.

[0040] 2) Preparation of ordered gas diffusion electrodes:

[0041] a. Preparation of surface-modified ordered nanowire array structure

[0042] The gas diff...

Embodiment 2

[0046] 1) Preparation of gas diffusion layer:

[0047] Soak Toray carbon paper in 20% PTFE aqueous solution, take it out and air dry after fully soaking, and weigh it. Repeat the above steps until the PTFE loading is about 15% (the mass of carbon paper after hydrophobization treatment). Mix VulcanXC-72 carbon powder with 20% PTFE aqueous solution at a mass concentration of 10% relative to the mass of carbon powder and PTFE, and dilute with ethanol 20 times the mass of carbon powder, disperse under ultrasonic conditions for 20 minutes, and stir evenly. The above-mentioned hydrophobized carbon paper was placed on a glass plate and fixed, and the above-mentioned slurry was scraped on the surface of the carbon paper, and weighed until the carbon powder loading was 1mgcm -2 , that is, the gas diffusion layer is obtained.

[0048] The graphene powder prepared by the thermal expansion method is ultrasonically dispersed in the ethanol solution, and the slurry is loaded on the surfac...

Embodiment 3

[0055] 1) Preparation of gas diffusion layer:

[0056] Soak Toray carbon paper in 20% PTFE aqueous solution, take it out and air dry after fully soaking, and weigh it. Repeat the above steps until the PTFE loading is about 15% (the mass of carbon paper after hydrophobization treatment). Mix VulcanXC-72 carbon powder with 20% PTFE aqueous solution at a mass concentration of 10% relative to the mass of carbon powder and PTFE, and dilute with ethanol 20 times the mass of carbon powder, disperse under ultrasonic conditions for 20 minutes, and stir evenly. The above-mentioned hydrophobized carbon paper was placed on a glass plate and fixed, and the above-mentioned slurry was scraped on the surface of the carbon paper, and weighed until the carbon powder loading was 1mgcm -2 , that is, the gas diffusion layer is obtained.

[0057] The multi-walled carbon nanotube powder prepared by the chemical vapor deposition method is ultrasonically dispersed in the ethanol solution, and the sl...

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Abstract

The invention relates to an ordered gas diffusion electrode, preparation and application thereof. The membrane electrode comprises a gas diffusion layer and a catalysis layer; the catalysis layer is an ordered catalysis layer, and is formed by interaction of conductive polymer nanowires arranged in an ordered array manner on the gas diffusion layer surface and phthalic acid diethylene glycol diacrylate (PDDA) doped on the surface of the conductive polymer nanowires with Pt catalyst particles. The ordered membrane electrode of the invention has the advantages of high utilization rate of precious metal Pt, high stability, and the like, can effectively reduces catalyst cost of fuel cells, and can improve the service life of fuel cells; meanwhile, the membrane electrode of the invention can effectively enhance the mass transfer of fuel in the catalysis layer, thereby improving the fuel utilization rate; the ordered membrane electrode of the invention can be used as a membrane electrode of proton exchange membrane fuel cells, direct liquid fuel cells, and proton exchange membrane water-type electrolytic baths.

Description

technical field [0001] The invention relates to an ordered gas diffusion electrode and its preparation and application, in particular to a gas diffusion electrode that can be used in a proton exchange membrane fuel cell, a direct liquid fuel cell or a proton exchange membrane type water electrolysis cell. The present invention also relates to a preparation method of the above ordered gas diffusion electrode. Background technique [0002] Due to its high efficiency and environmental friendliness, proton exchange membrane fuel cells have been paid close attention to by research institutions in various countries in recent years. Membrane electrode (MEA), as the core component of fuel cell, usually consists of gas diffusion layer, catalytic layer and proton exchange membrane. The catalytic layer is the place where the electrochemical reaction occurs in the membrane electrode assembly (MEA). The performance and stability of the catalytic layer largely determine the electrochemic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/94H01M4/88
CPCH01M4/8605H01M4/8807H01M4/8825H01M4/925Y02E60/50
Inventor 孙公权夏章讯王素力姜鲁华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI