Preparation method of proton exchange film fuel cell film electrode

Abstract

The invention provides a preparation method of a proton exchange film fuel cell film electrode. Pt / C catalyst layers are coated on two sides of a proton exchange film respectively to obtain a CCM filmsemi-finished product, and anti-reverse pole slurry layers are coated on peripheral edges of anode surfaces of the CCM film semi-finished product; the preparation process of the anti-reverse pole slurry specifically comprises steps of adding an antipole substance into deionized water, uniformly mixing the mixture to form mixed solution, adding mixed solution of organic solvent and proton exchangefilm resin solution into the mixed solution, and uniformly mixing the mixture to obtain anti-reverse pole slurry; the solid content of the anti-reverse pole slurry is controlled to be 1-4%, the anti-reverse pole substance is one or more of iridium, rubidium, tin, cobalt metal and metal oxide thereof, and the organic solvent is one or more of ethanol, isopropanol, tert-butyl alcohol and n-propyl alcohol. The method is simple in process, can reduce the probability of occurrence of a reverse pole phenomenon of a fuel cell in the operation process, and reduces a perforation phenomenon.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a method for preparing membrane electrodes of proton exchange membrane fuel cells. Background technique [0002] During the actual operation of the fuel cell, various operating conditions will inevitably occur. During the start-up and shutdown of the battery, especially in the state of high-current instantaneous loading, the membrane electrodes will be damaged due to reasons such as unreasonable gas distribution and gas supply lag. There are short-term abnormal working conditions in the area, and the local and surface of the catalyst are prone to voltage dips and even reverse polarity, especially at the edge of the membrane electrode, which is a multi-interface contact point, and insufficient gas supply is more likely to occur, and reverse polarity is very prone to occur. It will affect the stability and life of the fuel cell. In severe cases, the membrane electrode will be perforated a...

AI Technical Summary

Problems solved by technology

[0002] During the actual operation of the fuel cell, various operating conditions will inevitably occur. During the start-up and shutdown of the battery, especially in the state of high-current instantaneous loading, the membrane electrodes will be damaged due to reasons such as unreasonable gas distribution and gas supply lag. There are short-term abnormal working conditions in the area, and the local and surface of the catalyst are prone to voltage dips and even reverse polarity, especially at the edge of the membrane electrode, which is a multi-interface contact point, and insufficient gas supply is more likely to occur, and reverse polarity is very prone to occur. Affect the stability and life of the fuel cell. In severe cases, the membrane electrode will be perforated and the entire membrane electrode will be scrapped.

Aiming at the anti-polarity phenomenon, at present, it is mainly focused on modeling and analysis, and there are also a small number of improvement methods for this phenomenon, mainly to modify and optimize the conventional Pt / C catalyst, so as to speed up the battery response and alleviate the difference in response to working conditions. Purpose, this method increases the difficulty of catalyst preparation, thereby increasing the cost of membrane electrodes, and fails to significantly improve the phenomenon of edge membrane perforation