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Membrane electrode and preparation method thereof

A membrane electrode and preparation step technology, applied in battery electrodes, circuits, fuel cells, etc., can solve problems such as affecting pore structure, affecting oxygen transmission, swelling of perfluorosulfonic acid resin, etc., and achieves high ion exchange capacity, low equivalent weight, The effect of strong water absorption

Inactive Publication Date: 2020-11-06
SINOHYKEY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the transfer of protons requires water, too much water will fill the pore structure on the one hand and cause water flooding; on the other hand, it will cause the perfluorosulfonic acid resin in the cathode catalyst layer to swell and affect the pore structure.
Both of the above aspects will affect the transfer of oxygen in the cathode catalytic layer, thereby reducing the efficiency of the cell
Some methods and membrane electrode structures to solve the above problems are disclosed in the prior art, but these methods and structures are difficult to balance the water content and oxygen transfer rate of the cathode catalyst layer

Method used

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  • Membrane electrode and preparation method thereof
  • Membrane electrode and preparation method thereof

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Embodiment 1

[0022] like figure 1 , the preparation method of membrane electrode comprises the following steps:

[0023] (a) Preparation steps of outer sublayer 1

[0024] The outer layer cathode catalyst slurry is coated on one side of the cathode gas diffusion layer 2 by the method of slit coating, and after being dried by hot air at 90° C., a prefabricated cathode gas diffusion layer with an outer sublayer 1 is formed. The outer sublayer 1 The platinum loading was 0.10 mg / cm2 and the thickness was 3.7 μm.

[0025] The outer layer cathode catalyst slurry is prepared by mixing the following raw materials by mass percentage: 5-12% of platinum and carbon particle catalyst, 4-8% of perfluorosulfonic acid resin and 80-91% of solvent.

[0026] Wherein, the commercialized Aquivion D79 perfluorosulfonic acid resin with an equivalent weight of about 800 is selected for the perfluorosulfonic acid resin resin, and the Tec10F50e produced by Japan's Tanaka Precious Metals (TKK) is selected for the ...

Embodiment 2

[0037] Change the platinum loading of outer sublayer 1 in step (a) of Example 1 to 0.05 mg / cm 2 , the thickness is 1.9 μm, and the platinum loading of the inner sublayer 3 in step (b) of Example 1 is changed to 0.3 mg / cm 2 , with a thickness of 11.2 μm. The steps are the same as those in the first embodiment.

Embodiment 3

[0039] Change the platinum loading of outer sublayer 1 in step (a) of Example 1 to 0.15 mg / cm 2 , the thickness is 5.6 μm, and the platinum loading of the inner sublayer 3 in step (b) of Example 1 is changed to 0.20 mg / cm 2 , with a thickness of 7.4 μm. The steps are the same as those in the first embodiment.

[0040]The thicknesses of the inner sublayer 3 and the outer sublayer 1 can be adjusted according to requirements, but the thickness of the outer sublayer 1 needs to be less than half the thickness of the cathode catalyst layer (ie, the outer sublayer 1 and the inner sublayer 3). According to practice, if the high-equivalent perfluorosulfonic acid resin is thick, on the one hand, the waterproof effect is not good, and on the other hand, it is not easy to achieve in the coating process and industrial production. Even if it can be achieved, the coating is prone to defects. Thereby affecting the performance of the membrane electrode. Further preferably, the thickness of ...

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Abstract

The invention relates to the technical field of fuel cells. The invention particularly relates to a membrane electrode. The membrane electrode comprises an anode gas diffusion layer, an anode catalystlayer, a proton exchange membrane, a cathode catalyst layer and a cathode gas diffusion layer which are arranged in sequence, wherein the cathode catalyst layer is mainly prepared from perfluorosulfonic acid resin and a catalyst, the cathode catalyst layer comprises at least two cathode catalyst sub-layers, and the equivalent weight of the perfluorosulfonic acid resin in the sub-layer close to the proton exchange membrane is smaller than that of the perfluorosulfonic acid resin in the sub-layer close to the cathode gas diffusion layer. According to the membrane electrode, the cathode catalystlayer has certain water content to ensure proton transfer, and oxygen transfer is not influenced by excessive water content. The invention also provides a preparation method of the membrane electrode.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a membrane electrode and a preparation method thereof. Background technique [0002] The proton exchange membrane fuel cell uses hydrogen and oxygen as the reactant gas. The membrane electrode is the place where the hydrogen and oxygen undergo electrochemical reaction and generate electricity, heat and water, and is the heart of the fuel cell. The membrane electrode consists of an anode gas diffusion layer, an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer and a cathode gas diffusion layer. The hydrogen is decomposed into protons under the action of the anode catalyst layer, and electrons are released. The electrons reach the cathode through the external circuit. The protons reach the cathode catalyst layer through the proton exchange membrane, and electrochemically react with the oxygen in the cathode catalyst layer to obtain electrons to generate ...

Claims

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Application Information

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IPC IPC(8): H01M8/1004H01M4/86
CPCH01M4/8657H01M8/1004H01M2004/8684Y02E60/50
Inventor 赵明全莫善云邵雨薇杨云松叶思宇邹渝泉唐军柯孙宁
Owner SINOHYKEY TECH CO LTD
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