Preparation method of proton exchange membrane fuel cell catalyst layer
A proton exchange membrane and fuel cell technology, applied in solid electrolyte fuel cells, battery electrodes, circuits, etc., can solve the problems of Pt black that cannot be screen printed, and achieve the effects of good uniformity, easy operation, and good discharge performance
Active Publication Date: 2014-01-08
SHANGHAI INST OF SPACE POWER SOURCES
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Problems solved by technology
[0011] Based on the above analysis, in the current patent, Pt black has not yet been screen printed, and has achieved excellent electrical properties.
Method used
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Embodiment 1
[0028] Configure HEC thickener:
[0029] Add 2.5g of HEC into 97.5g of deionized water, and stir it magnetically for 4 hours to make 2.5% HEC colloid.
[0030] Configuration of printing paste:
[0031] Take 1g of Pt black (from Johnson Matthey Company) catalyst, add 1.1g of 10% commercial Nafion emulsion (from Dupont Company), and stir for 0.5h; then add 1.5g of 2.5% HEC, magnetically stir for 1h, and add 0.5ml of ethanol. Stir magnetically for 12 hours; obtain screen printing paste.
[0032] printing:
[0033] Select 100 mesh for the stencil, and the thickness of the photosensitive adhesive is 20um. GDS3260 carbon paper (from Ballard Company) was fixed and printed once with the screen printing paste prepared above.
[0034] Dry at 120°C for 10 minutes to remove the solvent.
[0035] Obtain the loading capacity of pure Pt black catalyst by weighing, it is 1mg / cm 2 .
[0036] Repeat for 5 electrodes.
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The invention discloses a preparation method of a proton exchange membrane fuel cell catalyst layer. The method is used for preparing a catalyst layer on a conductive substrate through a silk-screen printing method and comprises the following steps: 1. arranging a silk-screen printing stencil on the conductive substrate, and printing a catalyst layer on the conductive substrate through catalyst slurry by means of the silk-screen printing stencil; and 2. heating to remove a solvent in the catalyst layer. The viscosity of the pure metal catalyst slurry prepared by the method disclosed by the invention is equivalent to that of silk-screen printing commercial slurry; electrode silk-screen printing can be realized, the electrochemical performance is greatly improved and the uniformity of electrodes is improved, therefore the preparation method is suitable for mass production.
Description
technical field [0001] The invention relates to a fuel cell, in particular to a preparation method for a catalytic layer of a fuel cell. Background technique [0002] Membrane electrode (MEA) is a key component of fuel cells and a key factor in determining cell performance. The catalyst coating on the membrane electrode is formed by dispersing the catalyst into the solution to form a catalyst slurry, and then coating it on the membrane or carbon paper by various methods. [0003] In hydrogen-oxygen proton exchange membrane fuel cells, in order to ensure the durability of the electrode, the cathode catalyst is usually a pure Pt metal catalyst. Unlike carbon-supported platinum catalysts, which have low density and are easy to disperse, Pt black is prone to sedimentation and stratification when preparing slurry due to its high metal density. These factors will lead to the instability of the catalyst slurry, which is not conducive to the preparation of the catalytic layer, and...
Claims
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IPC IPC(8): H01M4/88
CPCY02E60/50H01M4/8835H01M4/8882H01M4/9083H01M8/10
Inventor 王丽娜张伟刘向王涛
Owner SHANGHAI INST OF SPACE POWER SOURCES