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Catalyst coating film, fuel cell and preparation method of catalyst coating film

A catalyst and membrane coating technology, applied in fuel cells, fuel cell components, battery electrodes, etc., can solve the problems of reducing mass transfer impedance, and membrane electrodes cannot take into account water management at the same time, so as to reduce mass transfer impedance and improve Effectiveness of utilization efficiency and increase of active area

Active Publication Date: 2020-04-24
SHENZHEN GENERAL HYDROGEN ENERGY TECH CORP LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the preparation process of membrane electrodes has been improving and the performance of fuel cells is also improving, none of the above-mentioned membrane electrodes can simultaneously manage water, reduce mass transfer resistance, and improve catalyst utilization efficiency.

Method used

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  • Catalyst coating film, fuel cell and preparation method of catalyst coating film
  • Catalyst coating film, fuel cell and preparation method of catalyst coating film
  • Catalyst coating film, fuel cell and preparation method of catalyst coating film

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preparation example Construction

[0038] At present, the commonly used preparation methods of membrane electrodes mainly include the following methods. The traditional method is to coat the catalyst on the gas diffusion layer to prepare a gas diffusion layer electrode, and then press the gas diffusion layer electrode and the proton exchange membrane together by high temperature hot pressing to prepare a membrane electrode. In this membrane electrode preparation method, the active material particles in the catalytic layer are easily pressed into the pores of the microporous layer in the gas diffusion layer under high pressure, blocking the pore channels of the gas diffusion layer and greatly increasing the mass transfer. Resistance, and reduce the utilization efficiency of the catalyst. At the same time, since the proton exchange membrane and the gas diffusion layer electrodes are bonded together by high-temperature hot pressing, the contact between the proton exchange membrane and the catalytic layer is not ve...

Embodiment 1

[0082] The first step: the pretreatment of proton exchange membrane and the preparation of catalyst slurry, it comprises the following steps:

[0083] (1) Pretreatment of proton exchange membrane: Soak a 7.1cm*7.1cm proton exchange membrane in 5% hydrogen peroxide solution, place it in an environment of 70°C for 5 hours, and then wash it three times with deionized water , then soak it in 0.5mol / L sulfuric acid, place it in a constant temperature environment of 60°C for 1h, wash it with deionized water three times, and finally place the proton exchange membrane in a vacuum drying oven at 60°C for 24h.

[0084] (2) Preparation of catalyst slurry: fully mix a certain mass of Pt / C catalyst, deionized water, isopropanol, and Nafion solution evenly. Wherein the mass ratio of Pt / C catalyst to nafion is 2:1. The mass ratio of deionized water: isopropanol is 5:3. The solid content of the catalyst slurry is 25%.

[0085] In the above example 1, the mass of Pt / C catalyst is 1.2g, the ...

Embodiment 2

[0090] The first step: the pretreatment of proton exchange membrane and the preparation of catalyst slurry, it comprises the following steps:

[0091] (1) Pretreatment of proton exchange membrane: Soak a 7.1cm*7.1cm proton exchange membrane in 5% hydrogen peroxide solution, place it in an environment of 70°C for 5 hours, and then wash it three times with deionized water , then soak it in 0.5mol / L sulfuric acid, place it in a constant temperature environment of 60°C for 1h, wash it with deionized water three times, and finally place the proton exchange membrane in a vacuum drying oven at 60°C for 24h.

[0092] (2) Preparation of catalyst slurry: fully mix a certain mass of Pt / C catalyst, deionized water, isopropanol, and Nafion solution evenly. Wherein the mass ratio of Pt / C catalyst to nafion is 2:1. The mass ratio of deionized water: isopropanol is 5:3. The solid content of the catalyst slurry is 25%.

[0093] In the above example 2, the mass of the Pt / C catalyst is 1.2 g,...

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Abstract

The invention discloses a catalyst coating film, a fuel cell and a preparation method of the catalyst coating film. The catalyst coating film comprises: a proton exchange membrane; and catalytic layers formed on the two opposite sides of the proton exchange membrane, wherein the surface of each catalytic layer has a three-dimensional microstructure. Technical support can be provided for obtaininga membrane electrode and the fuel cell which give consideration to water management, mass transfer impedance reduction and catalyst utilization efficiency improvement at the same time.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a catalyst coating membrane, a fuel cell and a preparation method. Background technique [0002] A fuel cell is an electrochemical cell whose main principle is to convert the chemical energy in fuel and oxidant directly into electrical energy through oxidation-reduction reactions. As an important branch of the fuel cell field, proton exchange membrane fuel cells not only have the general characteristics of fuel cells, but also have fast start-up speed at room temperature, small size, no electrolyte loss, easy drainage, long life, specific power and specific power. High energy and other outstanding advantages. [0003] Membrane electrodes are the core components of proton exchange membrane fuel cells. The catalytic layer is combined on the proton exchange membrane to prepare a catalyst coated membrane (CCM, Catalyst Coated Membrane), and then the CCM and the gas diffusion laye...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1006H01M8/026H01M4/88
CPCH01M4/8828H01M8/026H01M8/1006Y02E60/50Y02P70/50
Inventor 杨成樊建涛谢小军黄鹏辉张立徐娇艳黄衡恢
Owner SHENZHEN GENERAL HYDROGEN ENERGY TECH CORP LTD
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