Membrane electrode for proton exchange membrane fuel cell and preparation method of membrane electrode

Abstract

The invention relates to a membrane electrode for a proton exchange membrane fuel cell and a preparation method of the membrane electrode. The preparation method comprises the following steps: A, spinning catalyst slurry onto a microporous layer on the surface of hydrophobic carbon paper by adopting a variable-voltage electrostatic spinning process to obtain a gas diffusion catalyst layer integrated electrode; B, assembling according to the assembly sequence of the gas diffusion catalyst layer integrated electrode, the proton exchange membrane and the gas diffusion catalyst layer integrated electrode, and after assembly, preparing the membrane electrode for the proton exchange membrane fuel cell through a hot pressing or cold pressing process. The catalyst layer is directly spun on the gas diffusion layer by means of an electrostatic spinning technology, the thickness of the catalyst layer and the loading capacity of a catalyst are reduced, the dispersity of the catalyst is improved, and a fibrous structure obtained through spinning is good in uniformity and rich and moderate in pore structure; water transmission and air mass transfer in a high-current density area of the fuel cell are improved, and the cell performance is improved.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, in particular to a method for preparing membrane electrodes for proton exchange membrane fuel cells. Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is an energy device that directly converts hydrogen energy into electrical energy, and its energy conversion efficiency is as high as 60% to 70%. Due to its outstanding features such as low operating temperature (about 80°C), high energy density, and environmental friendliness, hydrogen fuel cells are expected to be widely used in automotive, aerospace and other fields in the future. [0003] As the core component of proton exchange membrane fuel cell, membrane electrode is composed of cathode, proton exchange membrane and anode. The quality of membrane electrode directly determines the performance of fuel cell. At present, no matter whether it has been commercialized or is in the laboratory resea...

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Problems solved by technology

[0004] In the current prior art, the catalyst layer is usually placed on the surface of a carbon paper coated with a microporous layer or a water management layer, hot pressed, and then the A proton exchange membrane is placed between two identical gas diffusion layer electrodes, the membrane is in contact with the catalyst layer, and then hot pressed, or arranged in the order of carbon paper-catalyst layer-proton exchange membrane-catalyst layer-carbon paper, and then hot pressing, but it should be pointed out that the defects in the prior art are: when the porous proton exchange membrane is directly impregnated with the catalyst slurry and then dried and hot pressed, the carbon-supported catalyst and Nafion are only in contact at the macroscopic level, and it is difficult to pass through at the microscopic level. Hot pressing makes Nafion wrap Pt intact. At the same time, this method will also cause Nafion in the catalytic layer to be too thick, which increases the resistance of proton conduction and is not conducive to water discharge.

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