阅读说明：本技术 一种低铂质子交换膜燃料电池膜电极及其制备方法 (Low-platinum proton exchange membrane fuel cell membrane electrode and preparation method thereof ) 是由 刘凯 张义煌 许笑目 陈杰 李刚 于 2020-05-15 设计创作，主要内容包括：本发明属于燃料电池技术领域,特别涉及到一种低铂质子交换膜燃料电池膜电极及其制备方法。本发明的低铂质子交换膜燃料电池膜电极包括在质子交换膜两侧涂布催化层,所述催化层包括多孔材料及填充在多孔材料内的催化剂,所述催化剂是铂载量为40%-60%的铂碳催化剂中的一种或多种。本发明膜电极的催化层采用多孔材料及填充在多孔材料内的催化剂制备而成,通过调节膜电极催化层结构来降低铂使用量,采用部分结构有序化工艺,调节膜电极催化层结构来降低铂使用量,降低燃料电池成本。本发明的膜电极相对于传统膜电极,因采用部分有序化结构,能够有效提高催化剂利用率,降低催化剂载量,克服膜电极溶胀问题,易于放大,有利于批量生产。(The invention belongs to the technical field of fuel cells, and particularly relates to a membrane electrode of a low-platinum proton exchange membrane fuel cell and a preparation method thereof. The membrane electrode of the low-platinum proton exchange membrane fuel cell comprises catalyst layers coated on two sides of a proton exchange membrane, wherein the catalyst layers comprise porous materials and catalysts filled in the porous materials, and the catalysts are one or more of platinum carbon catalysts with platinum loading capacity of 40% -60%. The catalyst layer of the membrane electrode is prepared from a porous material and a catalyst filled in the porous material, the platinum usage is reduced by adjusting the catalyst layer structure of the membrane electrode by adopting a partial structure ordering process, and the fuel cell cost is reduced. Compared with the traditional membrane electrode, the membrane electrode provided by the invention adopts a partial ordered structure, so that the utilization rate of the catalyst can be effectively improved, the catalyst loading capacity is reduced, the swelling problem of the membrane electrode is solved, the membrane electrode is easy to enlarge, and the membrane electrode is beneficial to batch production.)

1. A low platinum proton exchange membrane fuel cell membrane electrode comprises catalyst layers coated on two sides of a proton exchange membrane, and is characterized in that the catalyst layers comprise porous materials and catalysts filled in the porous materials, and the catalysts are one or more of platinum carbon catalysts with platinum loading of 40% -60%.

2. The low platinum pem fuel cell membrane electrode of claim 1 wherein said porous material is made of a corrosion resistant and stable hydrophobic material comprising expanded polytetrafluoroethylene or/and polyvinylidene fluoride.

3. The membrane electrode assembly according to claim 1, wherein the porosity of the porous material is 80% or more, the actual thickness of the porous material is 1 to 10 μm, and the actual pore size is 10 to 200 μm.

4. The method for preparing a membrane electrode assembly for a proton exchange membrane fuel cell with low platinum content as claimed in claim 1, comprising the steps of:

(1) preparing a catalyst layer on the surface of the porous material by using a film preparation technology, wherein the platinum loading capacity on the surface of the catalyst layer is 0.05-0.3mg/cm²；

(2) Spraying perfluorinated sulfonic acid resin solution on the surface of the catalyst layer to obtain the catalyst layer with bonding performance, wherein the content of the perfluorinated sulfonic acid resin on the surface of the catalyst layer is 0.04-0.3mg/cm²；

(3) Pressurizing and assembling the catalytic layer prepared in the step (2) and a proton exchange membrane to obtain a proton exchange membrane CCM covered by the catalytic layer, wherein the pressurizing temperature is 25-140 ℃, the pressure is 10-30bar, and the pressurizing time is 50-180 s;

(4) and (4) dispensing glue on the two surfaces of the CCM, and then bonding a gas diffusion layer to obtain the membrane electrode of the low-platinum proton exchange membrane fuel cell.

5. The method for preparing a membrane electrode of a low-platinum proton exchange membrane fuel cell according to claim 4, wherein the method for preparing the catalytic layer in the step (1) comprises the following steps: and soaking the porous material in the catalyst ink, taking out the porous material and drying when the content of the catalyst in the porous material is not increased any more, and coating and drying the catalyst ink on the surface of the dried porous material.

6. The method for preparing a membrane electrode of a low platinum proton exchange membrane fuel cell according to claim 5, wherein the drying process is performed in an oven with a set temperature of 40-150 ℃.

7. The method for preparing the membrane electrode assembly of the low-platinum proton exchange membrane fuel cell according to claim 4, wherein the concentration of the perfluorinated sulfonic acid resin solution in the step (2) is 0.05wt% -0.5wt%, the perfluorinated sulfonic acid resin solution is prepared by diluting a high-concentration Nafion solution to a target concentration by using isopropanol or propanol aqueous solution with the volume fraction of 50%, and the loading of the perfluorinated sulfonic acid resin is 0.01-0.1mg/cm²。

8. The method of claim 4 wherein the catalytic layer has an anode platinum loading of 0.05-0.15mg/cm²。

9. The method for preparing a membrane electrode assembly for a proton exchange membrane fuel cell according to claim 4, wherein the thickness of the CCM prepared in the step (3) is 28 to 40 μm.