Proton exchange model fuel cell unit, membrane electrode group and gaseous diffusion layer structure

Abstract

The invention relates to a proton exchange model fuel cell unit, a membrane electrode group and a gaseous diffusion layer structure. The gaseous diffusion layer structure is applied to the membrane electrode group of the proton exchange model fuel cell unit and at least comprises a material layer which is provided with a flow penetration capability distribution profile firstly progressively increasing and progressively decreasing from a start region to an end region and having optimal flow penetration capability in the rapid reaction position. The gaseous diffusion layer structure can considerate the permeability of a gaseous diffusion layer and the wettability of a proton exchange film to improve the effect of the membrane electrode group of a fuel cell and further improve the performance of the fuel cell.

Description

technical field [0001] The invention relates to a gas diffusion layer (gas diffusion layer, GDL) structure applied to a fuel cell, in particular to a gas diffusion layer structure applied to a proton exchange membrane fuel cell (proton exchange membrane fuel cell, PEMFC). Background technique [0002] With the rising price of petrochemical energy and the depletion of reserves, the search for energy alternatives can be said to be in the ascendant, and fuel cells are a promising alternative. In recent years, the technical development of fuel cells has made significant progress in both basic scientific research and commercial application development. The so-called fuel cell (Fuel Cell) is a direct energy conversion device that converts the chemical energy stored in the fuel directly into electrical energy through a catalyst and electrocatalytic reaction mechanism. Compared with traditional power generation methods, fuel cell power generation technology has the advantages of lo...

AI Technical Summary

Problems solved by technology

[0007] 2. The water conductivity of the gas diffusion layer has a great impact on the water management of the fuel cell. If the water cannot be discharged smoothly, the gas channels will be blocked by water, and the fuel and oxygen (air) will not be able to react smoothly. place, such as the catalyst layer, the overall efficiency will become poor

[0008] 3. The proton exchange membrane needs the help of water when conducting protons, so if all the generated water is discharged, the proton exchange membrane cannot get the required water, and the overall efficiency is also not good, especially in the early stage of the reaction or when the reaction is relatively slow. slow area

Therefore, when the reaction rate at the outlet is already low, too high a through-hole density may remove too much water, which is not conducive to the improvement of the efficiency of the MEA

Images