A kind of preparation method of fuel cell membrane electrode

A fuel cell membrane and membrane electrode technology, applied in fuel cells, battery electrodes, circuits, etc., can solve the problems of large transmission resistance proton-conducting polymers, overfilling proton exchange membranes, etc., to improve interlayer contact and interface bonding force , reduce manufacturing defects, and reduce the effect of gas barrier ability

Active Publication Date: 2022-07-15
嘉寓氢能源科技(辽宁)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention aims at the large transmission resistance of the membrane-electrode interface in the prior art and the fact that the liquid proton-conducting polymer easily penetrates into the pores and cracks of the catalytic layer or the gas diffusion layer during the preparation of the membrane-electrode, causing the proton-conducting polymer to be overfilled and the prepared protons The problem of defects in the exchange membrane, a membrane electrode preparation method is proposed

Method used

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  • A kind of preparation method of fuel cell membrane electrode
  • A kind of preparation method of fuel cell membrane electrode
  • A kind of preparation method of fuel cell membrane electrode

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Embodiment 1

[0043] The present embodiment relates to a method for preparing a membrane electrode of a fuel cell. The membrane electrode structure is as follows: figure 2 As shown, from bottom to top, it includes a gas diffusion electrode 1, a proton exchange membrane layer 2, an insulating gas-tight frame layer 3, a proton exchange membrane layer 2 and a gas diffusion electrode 1; the gas diffusion electrode 1 includes a gas diffusion layer 11 and a catalytic layer. 12; the proton exchange membrane layer 2 is located on the catalytic layer 12 side of the gas diffusion electrode 1.

[0044] The process flow of the membrane electrode in this embodiment is as follows figure 1 shown, including the following steps:

[0045] a) Coat the 20wt% Nafion solution evenly on the PTFE substrate using a doctor blade coating device, and the coating size of the Nafion solution in this example is 10cm*30cm;

[0046] b) Preparation of membrane-coated electrode: A gas diffusion electrode with the same size ...

Embodiment 2

[0051] The process flow of the membrane electrode in this embodiment is as follows figure 1 As shown, it specifically includes the following steps;

[0052] a) uniformly coat the 20wt% Nafion solution on the glass substrate using a slit extrusion coating equipment, and the coating size of the Nafion solution in this embodiment is 10cm*30cm;

[0053] b) Preparation of membrane-coated electrode: A gas diffusion electrode with the same size as the 20 wt% Nafion solution coating is placed on the proton-conducting polymer solution coated in step a), wherein the catalytic layer side of the gas diffusion electrode is connected to the proton-conducting polymer solution. The conductive polymer solution was contacted; then the prepared samples were placed in an oven at 80°C to dry for 4 hours, and then annealed and heat-treated at 120°C for 60 minutes, and then peeled off from the glass substrate to obtain a membrane-coated electrode;

[0054] c) Cutting for standby: the large-size mem...

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Abstract

The invention discloses a method for preparing a membrane electrode of a fuel cell, in particular, using a coating technology to coat a large-area proton-conducting polymer solution on a coating substrate; placing the coated proton-conducting polymer solution on the coated Gas diffusion electrodes with the same coverage area; peel off the coated substrate after drying and molding, and cut into multiple membrane-coated electrodes of required size for use; place the insulating gas-tight frame on the membrane side of the two membrane-coated electrodes, A membrane electrode embryo body is formed, and an integrated membrane electrode is obtained after hot pressing. This method can optimize the three-phase interface of the membrane electrode, reduce the interfacial substance transport resistance of the membrane electrode, reduce the penetration of the proton-conducting polymer solution into the pores and cracks of the catalytic layer during the direct membrane deposition process, and increase the catalytic activity of the membrane electrode and the proton exchange membrane. The ability to block gas. This is a scalable membrane electrode fabrication method based on coating technology, which optimizes membrane electrode fabrication technology and can be produced both continuously and intermittently.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and relates to a method for preparing an integrated membrane electrode for fuel cells; in particular, it relates to a preparation method for an integrated membrane electrode based on direct membrane deposition technology, which can reduce the penetration of a proton conductive polymer solution. Background technique [0002] Fuel cells can directly convert chemical energy into electrical energy through electrochemical reactions, and are considered to be an important green energy technology. Membrane electrode is the core component of proton exchange membrane fuel cell (PEMFC). As the place where electrochemical reaction occurs, membrane electrode plays a key role in fuel cell, and its characteristics directly determine the overall performance of fuel cell. The structural design and fabrication process of membrane electrodes have always been the core technologies in the field of PEMFC. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1004H01M4/88
CPCH01M8/1004H01M4/88Y02P70/50
Inventor 任杰邢以晶李卓群
Owner 嘉寓氢能源科技(辽宁)有限公司
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