Method for preparing catalytic layer structure of proton exchange membrane fuel cell

Abstract

The invention relates to a method for preparing a catalytic layer structure of a proton exchange membrane fuel cell. The method comprises the following steps of: (1) adding carbon powder and an electrolyte resin solution to isopropanol to obtain mixed liquid, carrying out ultrasonic treatment to uniformly mix the mixed liquid, then dispersing the mixed liquid into a proton exchange membrane, and carrying out drying treatment to form a carbon powder layer on the membrane so as to obtain the proton exchange membrane with the carbon powder layer; (2) dipping the proton exchange membrane with the carbon powder layer into a solution containing a platinum precursor and a weak reducing agent, standing for 48-72 hours at room temperature, taking the proton exchange membrane out, repeatedly rinsing the proton exchange membrane for multiple times by deionized water, and then carrying out drying treatment to obtain the proton exchange membrane with a platinum nanowire catalyst deposited on the carbon powder layer; and (3) spraying a layer of electrolyte solution on the surface of the platinum nanowire catalyst and then carrying out drying treatment to obtain the catalytic layer structure of the proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, in particular to a method for preparing a catalytic layer structure of proton exchange membrane fuel cells. Background technique [0002] A fuel cell is a clean, efficient, and long-life power generating device. Compared with conventional power generation technologies, fuel cells have great advantages in terms of efficiency, safety, reliability, flexibility, cleanliness, and operability, and their application prospects are very broad. As a kind of fuel cell, proton exchange membrane fuel cell also has the advantages of low operating temperature, high specific energy, long service life, fast response speed, and no electrolyte leakage. It has a good application prospect. [0003] The core component of a proton exchange membrane fuel cell is a membrane electrode (Membrane Electrode Assembly, MEA), which is composed of an anode, a cathode and a polymer electrolyte membra...

AI Technical Summary

Problems solved by technology

This method is simple and easy, improves the efficiency of electrode preparation and simplifies the process flow, and the catalyst is in good contact with the proton conductor polymer, but the porosity of the catalytic layer is low, which is not conducive to the gas diffusion process, and the utilization rate of the electrode catalyst and the Three-phase reaction interface needs to be improved

The third is to mix the prepared carbon-supported catalyst with a certain amount of solid polymer electrolyte solution evenly, spray it on an intermediate medium, and then transfer it to the proton exchange membrane by heating and pressing. This method can effectively avoid swelling and deformation of the membrane when it encounters a solvent, and the contact between the catalytic layer and the membrane is good, but the process is cumbersome, and there are still problems that the utilization rate of the catalyst and the three-phase reaction interface need to be improved.

This ultra-thin proton exchange membrane structure has the problem that platinum is mainly deposited on the surface of carbon nanotubes, and the specific surface of platinum is small.

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