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A kind of ordered gas diffusion electrode and its preparation method and application

A gas diffusion electrode and gas diffusion layer technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of large mass transfer resistance and affect the overall performance of batteries, achieve high utilization rate, improve oxygen reduction capacity per unit mass, Practical effect

Active Publication Date: 2017-05-24
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

In the traditional gas diffusion electrode or membrane electrode mentioned above, the catalyst particles are Under the action of the binder, a loose and porous thin layer is formed, and the mass transfer resistance of the reactants in the disordered channels is relatively large, which affects the overall performance of the battery

Method used

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  • A kind of ordered gas diffusion electrode and its preparation method and application
  • A kind of ordered gas diffusion electrode and its preparation method and application
  • A kind of ordered gas diffusion electrode and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Preparation of gas diffusion layer:

[0038] 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 load is about 15%. Mix Vulcan XC-72 carbon powder with 10% PTFE aqueous solution relative to the total mass, dilute with ethanol, 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 1 mg cm -2 , that is, the gas diffusion layer is obtained.

[0039] 2) Preparation of gas diffusion electrode with porous skeleton structure:

[0040] a. Preparation of composite precursor slurry with porous framework structure

[0041] Disperse 50mg of graphite oxide in 100mL of deionized water, and disperse evenly by ultrasonic; add 80mg of dinitrosodiamine platinu...

Embodiment 2

[0045] 1) Preparation of gas diffusion layer:

[0046] 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 load is about 15%. Mix Vulcan XC-72 carbon powder with 10% PTFE aqueous solution relative to the total mass, dilute with ethanol, 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 1 mg cm -2 , that is, the gas diffusion layer is obtained.

[0047] 2) Preparation of gas diffusion electrode with porous skeleton structure:

[0048] a. Preparation of composite precursor slurry with porous framework structure

[0049] Disperse 80mg of graphite oxide in 100mL of deionized water, and disperse evenly by ultrasonic; add 80mg of dinitrosodiamine platinu...

Embodiment 3

[0053] 1) Preparation of gas diffusion layer:

[0054] 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 load is about 15%. Mix Vulcan XC-72 carbon powder with 10% PTFE aqueous solution relative to the total mass, dilute with ethanol, 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 1 mg cm -2 , that is, the gas diffusion layer is obtained.

[0055] 2) Preparation of gas diffusion electrode with porous skeleton structure:

[0056] a. Preparation of composite precursor slurry with porous framework structure

[0057] Disperse 100mg of graphite oxide in 100mL of deionized water, and ultrasonically disperse evenly; add 80mg of dinitrosodiamine plati...

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Abstract

The invention relates to a novel porous skeleton structure membrane electrode and its preparation and application. The membrane electrode is composed of a gas diffusion layer and a catalytic layer. The gas diffusion layer is Vulcan XC-72 carbon powder, acetylene black carbon powder, carbon nano Tubes or graphene mixed with PTFE or Nafion are loaded on the support layer. The catalytic layer is a porous skeleton structure catalytic layer, which is due to the Nafion polyion formed on the surface of the gas diffusion layer, carbon materials and nanometers loaded on it. It consists of a porous skeleton structure composed of platinum particles. The ordered membrane electrode of the present invention has the advantages of high utilization rate of noble metal Pt, high stability, and low mass transfer resistance, which can effectively reduce the cost of fuel cell catalysts and improve the performance and life of the fuel cell; at the same time, the membrane electrode of the present invention It can effectively enhance the mass transfer of fuel in the catalytic layer, thereby improving the utilization rate of fuel; the ordered membrane electrode of the present invention can be used as a membrane for proton exchange membrane fuel cells, direct liquid fuel cells and proton exchange membrane water-type electrolyzers electrode.

Description

technical field [0001] The invention relates to a novel porous skeleton structure gas diffusion electrode, in particular to a gas diffusion electrode which can be used in proton exchange membrane fuel cell, direct liquid fuel cell, metal air battery and proton exchange membrane type water electrolysis cell. [0002] The present invention also relates to a preparation method of the gas diffusion electrode with a novel porous skeleton structure. Background technique [0003] 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/86H01M4/88
CPCH01M4/86H01M4/88H01M4/8807Y02E60/50
Inventor 孙公权夏章讯王素力姜鲁华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI