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Manufacturing method of membrane electrode of fuel cell

A fuel cell membrane and manufacturing method technology, applied in fuel cell parts, fuel cells, battery electrodes, etc., can solve the problems of rare commercial CCM, unfavorable mass production, troublesome operation process, etc., and avoid technical difficulties. , maintain simplicity, improve the effect of utilization

Inactive Publication Date: 2007-07-18
SHANGHAI HORIZON FUEL CELL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The electrochemical performance of the CCM prepared by this process is also very good, and the difficulty is relatively low, but the operation process in the process is more troublesome, which is not conducive to large-scale production
At present, commercialized CCM produced by this process is relatively rare

Method used

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  • Manufacturing method of membrane electrode of fuel cell

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Effect test

Embodiment 1

[0031] After cleaning the commercially available expanded PTFE microporous membrane (thickness is 4-5 μm, porosity greater than 85%, pore diameter is 0.5-1 μm) with ethanol and put it flat on the 30BC carbon paper produced by SGL company; Nafion (5%wt) solution and 40%wt Pt / C particles are mixed into (Nafion solid: 40%Pt / C catalyst = 1: 3) catalyst dispersion and coated on the PTFE microporous membrane, after drying at 120°C A single electrode with a catalytic layer film attached to the carbon paper was prepared, wherein the loading amount of the catalyst and NAFION mixture was 1.4mg / cm 2 . Then two single electrodes with one NAFION111 membrane were heated at 180°C and 40kg / cm 2 The No. 1 membrane electrode was prepared by hot pressing under pressure for 1 min.

[0032] Contrast test: the commercially available Nafion (5%wt) solution and the particle of 40%wt Pt / C are mixed into (Nafion solid: 40%Pt / C catalyst=1: 3) catalyst dispersion liquid is coated on SGL company's produ...

Embodiment 2

[0034]Commercially available Nafion (5%wt) solution and 40%wt Pt / C particles were mixed into (Nafion solid: 40%Pt / C catalyst=1: 3) catalyst dispersion was applied to expanded PTFE microporous membrane ( The thickness is 4-5μm, the porosity is greater than 85%, and the pore size is 0.5-1μm) to make a catalytic layer membrane, in which part of the catalyst has entered the inside of the membrane pores, and part of the catalyst is located on one surface of the membrane, and a small amount of catalyst passes through the membrane to reach the membrane another surface of the The prepared catalytic layer film was dried at 120°C. Brush NAFION several times on an expanded PTFE film (thickness 10 μm, pore size 0.1 μm, porosity greater than 80%) to prepare a transparent e-PTFE reinforced proton exchange membrane, the thickness measured after preparation is 12 μm. Put the catalyst side of the two catalytic layer membranes against an e-PTFE reinforced proton exchange membrane, at 180°C, 40...

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Abstract

This invention provides a fuel cell membrane electrode preparation method, including two major steps of producing the catalytic layer membrane and membrane electrode. The catalyst layer membrane is produced by impregnating the catalyst dispersed liquid onto the microporous membrane. The membrane electrode is produced by pressing the catalyst layer membrane, carbon paper and proton exchange membrane together. Comparing with the existing technology, the invention improves the utilization of catalytic rate, saves the process of removing media without holes during preparing the catalytic layer membrane by thermal transfer print. In addition, it also plays a certain role in enhancing catalytic layer and membrane structure, regulating fuel cell catalyst water balance, and maintaining the stability of electrode operation.

Description

technical field [0001] The invention relates to a fuel cell, in particular to a manufacturing method of a fuel cell membrane electrode. Background technique [0002] At present, fuel cells, especially proton exchange membrane fuel cells (PEMFC) have become a technology researched and developed by many countries in the world. A fuel cell is a device that converts the chemical energy generated during the electrochemical reaction of fuel and oxidant into electrical energy. The core component of the device is the membrane electrode (Membrane Electrode Assembly, referred to as MEA). The membrane electrode is composed of a proton exchange membrane and two conductive porous diffusion materials (such as carbon paper) sandwiched on both sides of the membrane. A finely dispersed catalyst (such as metal platinum) that can initiate an electrochemical reaction is evenly distributed on the two boundary surfaces that are in contact with the conductive material. On both sides of the membr...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M8/02C08J5/22C08J9/00H01M8/1004
CPCY02E60/50Y02P70/50
Inventor 顾志军顾一雄
Owner SHANGHAI HORIZON FUEL CELL TECH
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