Preparation method and application of membrane electrode for improving water management of cathode catalyst layer of proton exchange membrane fuel cell

A fuel cell cathode, proton exchange membrane technology, applied in fuel cells, battery electrodes, electrochemical generators, etc., can solve the problems of reducing the conductivity of the catalytic layer, affecting the life of the membrane electrode, etc., to improve the utilization rate and mass specific activity. , The effect of improving electrochemical active area and mass specific activity and improving porosity

Pending Publication Date: 2022-04-29
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the existing membrane electrode preparation processes similar to optimizing the three-phase interface adopt the method of introducing additives or mechanically changing the structure of the catalytic layer. This way of introducing foreign additives or changing the structure has the risk of reducing the conductivity of the catalytic layer and will affect the membrane electrode. life

Method used

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  • Preparation method and application of membrane electrode for improving water management of cathode catalyst layer of proton exchange membrane fuel cell
  • Preparation method and application of membrane electrode for improving water management of cathode catalyst layer of proton exchange membrane fuel cell
  • Preparation method and application of membrane electrode for improving water management of cathode catalyst layer of proton exchange membrane fuel cell

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Experimental program
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Effect test

Embodiment 1

[0038] Prepare three cathode catalyst slurries according to the previous experimental plan; the first layer of catalyst slurries: accurately weigh 3g of catalyst Pt / C with a platinum content of 47%, and add a mass fraction of 10wt% perfluorosulfonic acid resin solution The resin solution I is a perfluorosulfonic acid resin solution of EW700, and then 70 g of low-boiling point alcohol isopropanol and 50 g of deionized water are added in sequence and then ultrasonically mixed for 20 minutes to form the catalytic layer slurry; the second layer Catalyst slurry: Accurately weigh 3g of catalyst Pt / C with a platinum content of 47%, add a mass fraction of 10wt% mixed perfluorosulfonic acid resin solution with a mass of 16 grams, and the resin solution is EW700 and EW1100 with a mass ratio of 1:1 A mixed solution of two perfluorosulfonic acid resins, that is, adding 8 grams of EW700 resin solution and 8 grams of EW1100 resin solution, then adding 70 g of low-boiling point alcohol isopro...

Embodiment 2

[0040] Prepare three cathode catalyst slurries according to the previous experimental plan; the first layer of catalyst slurries: accurately weigh 3g of catalyst Pt / C with a platinum content of 47%, and add a mass fraction of 10wt% perfluorosulfonic acid resin solution The resin solution I is a perfluorosulfonic acid resin solution of EW700, and then 70 g of low-boiling point alcohol isopropanol and 50 g of deionized water are added in sequence and then ultrasonically mixed for 20 minutes to form the catalytic layer slurry; the second layer Catalyst slurry: Accurately weigh 3g of catalyst Pt / C with a platinum content of 47%, add a mass fraction of 10wt% mixed perfluorosulfonic acid resin solution with a mass of 16 grams, and the resin solution is EW700 and EW1100 with a mass ratio of 1:3 A mixed solution of two perfluorosulfonic acid resins, that is, adding 4 grams of EW700 resin solution and 12 grams of EW1100 resin solution, then adding 70 g of low-boiling alcohol isopropanol...

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Abstract

The invention belongs to the technical field of proton exchange membrane fuel cells, and discloses a preparation method and application of a membrane electrode for improving water management of a cathode catalyst layer of a proton exchange membrane fuel cell. The membrane electrode comprises an anode catalyst layer, a proton exchange membrane, a cathode catalyst layer and a gas diffusion layer. Under a high relative humidity test, the hydrophobic layer reduces the capillary pressure gradient between the catalyst layer and the gas diffusion layer, so that water generated by reaction can be discharged towards the gas diffusion layer, and diffusion of the water towards the catalyst layer is inhibited. According to the invention, a gas / liquid / solid three-phase interface in the catalyst layer is optimized while the proton conduction capability is considered, and the hydrophilic-hydrophobic gradient is formed in the cathode catalyst layer, so that the water management is improved, and the performance of the fuel cell is greatly improved. The method is of great significance to follow-up slurry process development and platinum loading reduction, namely reduction of membrane electrode cost.

Description

technical field [0001] The invention belongs to the technical field of proton exchange membrane fuel cells, and more specifically relates to a preparation method and application of a membrane electrode for improving the water management of the cathode catalytic layer of the proton exchange membrane fuel cell. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) has the advantages of low operating temperature, high energy conversion efficiency, fast start-up, clean emission, no noise, no vibration, and high power density. It is currently the most promising new generation Green energy power system helps to solve problems such as energy crisis and environmental pollution. Membrane electrode assembly (MEA) is the heart of PEMFC, and the catalyst-coated membrane (CCM) in the membrane electrode is one of the key components that determine the performance of the entire membrane electrode. It is the reaction site of the fuel cell and realizes chemical energy. Con...

Claims

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Application Information

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IPC IPC(8): H01M4/88H01M4/86H01M4/90H01M8/1004
CPCH01M4/8825H01M4/8657H01M4/9008H01M8/1004H01M2004/8689Y02E60/50
Inventor 梁长海王强李闯
Owner DALIAN UNIV OF TECH
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