Ultrathin core assembly for synthetising catalyst coated membrane fuel cell by direct method

A proton exchange membrane and core component technology, which is applied in the field of preparing ultra-thin core components by direct method, can solve the problems of poor continuity and uniformity, low fuel cell electrical output, etc., and achieves low production cost and high battery output performance. , the effect of simple process

Inactive Publication Date: 2005-01-05
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
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Problems solved by technology

However, the catalyst layer of the synthesized CCM is relatively dense and has poor continuity and uniformity, and the electrical output of the fuel cell is not high.

Method used

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  • Ultrathin core assembly for synthetising catalyst coated membrane fuel cell by direct method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025]Ultrathin CCMs for proton exchange membrane fuel cells were prepared by laser printing technology. The slurry and powder with catalytic activity are prepared according to the ratio of electrocatalyst / proton exchange resin / hydrophobic agent / solvent / surfactant of 3:1:1:300:0.3. Take 6g of Pt / C electrocatalyst (produced by Johnson Matthey Company, the average particle diameter of the catalytically active particle Pt is 3nm, and the Pt loading is 40wt%) 1g, wet evenly with 5ml of deionized water, add 560ml of deionized water and 0.6g Polyvinyl alcohol (PVA), ultrasonically stirred for 20min. Then add 40g 5wt% Nafion® solution (produced by duPont company, 5wt% is Nafion® resin, about 95wt% is water, ethanol, isopropanol and other low-boiling alcohol components) and electric stirring for 10h, rotating speed 800r / h. Add 3.3g of 60wt% PTFE suspension, and ultrasonically stir for 30min to prepare a slurry. The slurry was filtered with suction and dried under vacuum at 80 °C for...

Embodiment 2

[0030] Ultrathin CCMs for proton exchange membrane fuel cells were prepared by electrostatic printing technology. The preparation of catalytically active slurry and powder, the pretreatment method of Nafion®111 membrane, and the single cell assembly and performance testing methods are the same as those in Example 1. The electrophotographic principle is used to transfer the powder with catalytic activity to the proton exchange membrane. Take a blank XEROX copier toner cartridge, put the powder into the toner cartridge and shake it evenly, and put it back into the copier. The copy density setting value is in the middle range. Make a piece of printing paper with a 5cm×5cm black pattern, and determine the position on the copy panel. A 6cm×6cm Nafion®111 film was adhered to the surface of a PTFE film (size 10cm×10cm, film thickness 100 μm, non-oriented film) and put into a paper box. The copying process is started and the powder is transferred to one side of the proton exchange m...

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Abstract

A preparation method for catalyst coated membranes is to turn a slurry containing catalyst, proton exchange resin, hydrophone, solvent and SAA to powders then to transfer the powders onto the proton exchange membrane to prepare CCM by laser printing technology or xerography. The mass fractional relations of the components are: catalyst: proton exchange resin: hydrophone: solvent: SAA=10:2-5:50-1000:2-5:1-5, its size is smaller than 20mum, no swelling or deformation appear, thickness of CCM is 30-35 mum, the error is less than 10%, the thickness of the layer is less than 10mum and less than 5mum for single.

Description

technical field [0001] The invention relates to a preparation method of a core component of a proton exchange membrane fuel cell, that is, a CCM (Catalyst coated membrane), in particular to a direct method for preparing an ultra-thin core component. Background technique [0002] CCM is developed in recent years and is different from the traditional MEA (Membrane electrode assembly, membrane electrode) structure. It is a functional component that directly combines the catalyst layer and the proton exchange membrane to realize the electrochemical process of the fuel cell. In traditional MEA, the catalyst is mainly printed on the diffusion layer, and then contacted with the proton exchange membrane by hot pressing to form a membrane electrode. In this electrode structure, the combination of the catalytic layer and the proton exchange membrane is poor, and the proton conduction is greatly affected. With CCM technology, the bonding strength between the catalytic layer and the me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M8/1004
CPCY02E60/12Y02E60/521Y02E60/50
Inventor 木士春潘牧袁润章
Owner WUHAN UNIV OF TECH
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