Single-roll transfer coating method for CCM electrodes of hydrogen fuel cells

Abstract

A single-roll transfer coating method for CCM (Catalyst Coated Membrane) electrodes of hydrogen fuel cells includes the following steps: S1, a surface A of a proton exchange membrane is coated with a first catalytic layer; S2, the first catalytic layer is baked at a first predetermined temperature; S3, a protective film on a surface B of the proton exchange membrane is removed; S4, a transfer roll arranged on one side of the surface B of the proton exchange membrane is coated with a second catalytic layer, the transfer roll is internally equipped with a heating source, and the second catalytic layer is heated at a second predetermined temperature through the transfer roll to evaporate at least the alcohol solvent in the second catalytic layer; and S5, the transfer roll cooperates with a press roll arranged on one side of the surface A of the proton exchange membrane to transfer the baked second catalytic layer to the surface B of the proton exchange membrane to obtain a CCM electrode. The method has the advantage that the catalytic layer can be dried before transfer and cannot be taken away during transfer.

Description

technical field [0001] The invention relates to a coating method and equipment of a CCM (catalyst coated membrane) membrane electrode of a hydrogen fuel cell. [0002] technical background [0003] When coating the catalytic layer on both sides of the hydrogen fuel cell proton exchange membrane, since most of the solvents used in the catalytic layer are alcohols, such as methanol, ethanol, propanol, isopropanol, n-propanol or glycerol However, most of the proton exchange membranes currently used are perfluorosulfonic acid membranes. In this way, when the catalytic layer is coated on the proton exchange membrane, the presence of alcohol solvents will cause the proton exchange membrane to swell and affect the proton exchange. film quality. In order to solve the above swelling problem, people currently use two different coating methods, one is the support membrane coating method, which is to first coat one side (A side) of the proton exchange membrane with a first catalytic lay...

AI Technical Summary

Problems solved by technology

[0004] In the above three methods, whether the protective film or release paper is removed, part of the catalytic layer will be taken away more or less, or the transfer is incomplete, resulting in incomplete surface morphology of the catalytic layer and uneven thickness distribution of the catalytic layer. problem, this is not allowed

Images