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Ordered gas diffusion electrode, and production method and application thereof

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 the battery, achieve high utilization rate, improve the oxygen reduction capacity per unit mass, Practical effect

Active Publication Date: 2015-06-17
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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  • Ordered gas diffusion electrode, and production method and application thereof
  • Ordered gas diffusion electrode, and production method and application thereof
  • Ordered gas diffusion electrode, and production method and application thereof

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 ultrasonically disperse evenly; add 80mg of dinitrosodiamine platin...

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 a production method and an application thereof. The membrane electrode is composed of a gas diffusion layer and a catalysis layer, the gas diffusion layer is made through supporting Vulcan XC-72 carbon powder, acetylene black carbon powder, carbon nanotube or graphene mixed PTFE or Nafion to a support layer, and the catalysis layer is a porous skeleton structure catalysis layer, and is composed of Nafion polyions formed on the surface of the gas diffusion layer, a carbon material and a porous skeleton structure formed supported nanometer platinum particles. The ordered membrane electrode has the advantages of high utilization rate of the precious metal Pt, high stability, low mass transfer resistance, effective reduction of the cost of a fuel cell catalyst, improvement of the performances of a fuel cell, and prolongation of the life of the fuel cell; The membrane electrode effectively enhances the mass transfer of a fuel in the catalysis layer in order to improve the fuel utilization rate; and the ordered gas diffusion electrode can be used in proton exchange membrane fuel cells, direct liquid fuel cells and proton exchange membrane water electrolysis cells as a membrane 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 Applications(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
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