Ordered membrane electrode and preparation and application thereof

A membrane electrode, ordered array technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of high catalyst loading, large mass transfer resistance, affecting the overall performance of the battery, etc., and achieve easy amplification and reduce catalyst loading. , the effect of improving catalyst utilization

Active Publication Date: 2017-06-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the traditional membrane electrode mentioned above, the catalyst particles are Under the action of the binder, a loose and porous thi...

Method used

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  • Ordered membrane electrode and preparation and application thereof
  • Ordered membrane electrode and preparation and application thereof
  • Ordered membrane electrode and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] 1) Preparation of gas diffusion layer:

[0065] Immerse Toray carbon paper in 5% PTFE aqueous solution, take it out and air-dry after fully impregnated, and weigh it. Repeat the above steps repeatedly until the PTFE load is about 10%. Mix XC-72 carbon powder with 60% PTFE aqueous solution relative to the total mass, dilute with ethanol, disperse under ultrasonic conditions for 30 minutes and stir evenly. The above-mentioned hydrophobic treated carbon paper was placed on a glass plate and fixed, and then the slurry was scraped on the surface of the carbon paper, weighed after air drying, and the above steps were repeated until the carbon powder loading was 0.4mg / cm2, and the gas diffusion layer was obtained.

[0066] 2) Preparation of ordered array carrier

[0067] The ordered array was prepared by chemical polymerization, the above gas diffusion layer was placed in a solution containing 0.01M aniline, 1M perchloric acid, and 0.007M ammonium persulfate, and reacted at ...

Embodiment 2

[0071] The difference from the above-mentioned Example 1 is that: the concentration of aniline is 0.5M, and an ordered array carrier of conical structures is obtained, which is in a parallel arrangement structure: 85 conical structures per square micron; the height of the conical structures is 500nm; the diameter of the bottom of the conical structures is 110nm; Conductivity is 68S cm -1 .

Embodiment 3

[0073] The difference from the above Example 1 is that the reaction temperature during the preparation of the ordered carrier is 25°C, and the ordered array carrier of the conical structure is obtained, which is in the form of a rattan cluster structure: 89 conical structures per square micron; the height of the conical structure is 177nm; the diameter of the bottom of the conical structure is 56nm; the conductivity is 35S cm -1 . .

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Abstract

The invention discloses an ordered membrane electrode. The ordered membrane electrode comprises an ordered array carrier and a catalyst nanoparticle layer which is microscopically attached to the surface of the ordered array carrier, wherein the ordered array carrier vertically grows on the surface of a gas dispersion layer in situ or vertically grows on the surface of a metal layer attached to the surface of an electrolyte membrane in situ; the ordered array carrier is constructed by a conductive high-molecular polymer, or is constructed by a mixture of a conductive high-molecular polymer and an ionic conductor; the ordered array carrier microscopically has a conical structure or a stick-shaped structure. An ordered electrode catalyst layer is prepared by the following steps: (1) preparing an ordered array carrier; (2) preparing a catalyst nanoparticle layer through a magnetron sputtering method. Compared with the prior art, the membrane electrode has the advantages that an ordered conductive array is prepared on the gas dispersion layer or an electrolyte membrane, thereby contributing to mass transfer of gas, protons and electrons; a nano-thickness catalyst layer formed by the magnetron sputtering method has a small carrying amount and a high catalyst utilization rate; the ordered membrane electrode is simple and controllable in a preparation process, is easy to amplify, and is suitable for batch production.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a membrane electrode for a fuel cell; [0002] The invention also includes the preparation method and application of the membrane electrode. Background technique [0003] Due to the advantages of high efficiency, environmental friendliness, and low operating temperature, proton exchange membrane fuel cells or alkaline anion exchange membrane fuel cells have attracted extensive attention from domestic and foreign research institutions in recent years. Membrane electrode (MEA), as the core component of proton exchange membrane fuel cell or alkaline anion exchange membrane fuel cell, usually consists of gas diffusion layer, catalytic layer and proton exchange membrane or anion exchange membrane. The catalytic layer is the place where the electrochemical reaction takes place in the membrane electrode assembly (MEA). The utilization rate of the electrocatalyst and the ...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M4/88H01M8/02B82Y30/00
CPCB82Y30/00H01M4/8647H01M4/88H01M8/02H01M4/86Y02E60/50Y02P70/50
Inventor 孙公权孙瑞利王素力夏章讯付旭东
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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