Catalyst layer, membrane electrode assembly, fuel cell and production method

Abstract

The embodiment of the invention provides a catalyst layer, a membrane electrode assembly, a fuel cell and a production method, and relates to the field of fuel cells. The catalytic layer is mainly obtained by covering the surface of a bottom membrane with a dispersion mixture and drying, and the dispersion mixture comprises a solvent, a first supported catalyst, a second supported catalyst and ion exchange resin, wherein the first supported catalyst, the second supported catalyst and the ion exchange resin are dispersed in the solvent. A carbon carrier of the first supported catalyst is low-specific-surface-area carbon with a carbon specific surface area of 20-400. And the carbon carrier of the second supported catalyst is high-specific-surface-area carbon with the carbon specific surface area of 600-1800. The catalyst layer, the membrane electrode assembly and the fuel cell are excellent in initial performance and good in durability.

Description

technical field [0001] The application relates to the field of fuel cells, in particular, to a catalytic layer, a membrane electrode assembly, a fuel cell and a preparation method. Background technique [0002] Proton exchange membrane fuel cell (PEMFC for short) has the advantages of environmental protection, high energy density, high power generation efficiency, and fast start-up speed, and is considered to be one of the most potential future vehicle power sources. With the continuous improvement of commercialization, fuel cells are used more and more in commercial and passenger vehicles. Due to the complexity of vehicle working conditions, the requirements for fuel cells are getting higher and higher. [0003] Membrane Electrode Assemblies (MEA) is the core component of a proton exchange membrane fuel cell, which mainly consists of a gas diffusion layer (GDL), a catalytic layer (CL) and a proton exchange membrane , PEM for short). Among them, the catalytic layer, as a p...

AI Technical Summary

Problems solved by technology

Among them, the catalytic layer, as a place for electrochemical reactions, is mainly composed of carrier platinum or carbon-supported platinum alloy. During the start-up and shutdown of the fuel cell, due to the hydrogen-air interface at the anode, the cathode voltage exceeds 1V, and the battery voltage is too high. However, the high potential will lead to accelerated corrosion of the carbon support of the catalyst, and the continuous collapse of the catalytic layer, which will lead to a rapid decline in the performance of the membrane electrode assembly.

In order to ensure the high performance of current mainstream fuel cell commercial products, the carbon carrier used in the catalytic layer is carbon with high specific surface area, which is more likely to corrode and collapse under high potential, which leads to the widespread high potential corrosion resistance of existing products. Poor problem, unable to meet current international tolerance standards

Images