Preparation method of low-temperature proton exchange membrane fuel cell membrane electrode

Abstract

The invention discloses a preparation method of a low-temperature proton exchange membrane fuel cell membrane electrode. The preparation method comprises the following steps of preparing a carbon paper surface microporous layer (MPL), namely printing a carbon powder and PTFE mixed solution on the surface of a carbon paper subjected to hydrophobic treatment, drying, carrying out high-temperature treatment in an inert atmosphere, and cooling to obtain a gas diffusion layer (GDL) of which the surface is provided with an MPL layer; depositing Pt nanoparticles directly on the MPL layer by adoptingan atomic layer deposition (ALD) technology to form a continuous gas diffusion electrode (GDE); uniformly spraying the ion resin onto the electrode; and assembling the membrane electrode according toan order of a cathode gas electrode, a proton exchange membrane and an anode gas diffusion electrode. The catalyst layer prepared by the atomic layer deposition technology is very clean, the preparation of a thin catalyst layer is facilitated, the pore structure is rich, the uniformity is good, the traditional thought of firstly preparing a catalyst slurry and then preparing an electrode catalystlayer is broken through, and the prepared membrane electrode is beneficial to improving the performance of a large-current density region of a fuel cell.

Description

technical field [0001] The invention relates to the field of proton exchange membrane fuel cells, in particular to a method for preparing membrane electrodes of low temperature proton exchange membrane fuel cells. Background technique [0002] Hydrogen energy is considered to be the ultimate solution to automobile energy, and proton exchange membrane fuel cell (PEMFC) is a very important energy way to convert hydrogen energy into electric energy, and its energy conversion efficiency is as high as 60% to 70%. Hydrogen fuel cells can be widely used in various modern vehicles due to their outstanding characteristics such as low operating temperature (about 80 °C), long life, fast response to load changes, high energy density, and environmental friendliness. [0003] Membrane electrode is the core component of proton exchange membrane fuel cell, and it is the place where hydrogen energy is converted into electrical energy. A typical fuel cell membrane electrode consists of a ca...

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Problems solved by technology

[0004] According to the search, in the prior art, the atomic layer deposition method is mainly used to deposit the platinum source on the carrier to prepare platinum or platinum shell-supported electrocatalysts (such as the Chinese invention patent application with the application number CN201710108023.8), which must be made into a film The electrodes still need to go through the tedious process of preparing slurry and making electrodes, which not only reduces the production efficiency, but also problems in the intermediate links may affect the performance of the final membrane electrode

In the traditional spraying and printing electrode technology, the problem of catalyst sedimentation often occurs during the slurry spraying or printing process, which will not only cause blockage of the pipeline, but also cause great inhomogeneity of the catalytic layer, affecting the membrane electrode. performance

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