Process for manufacturing porous diffusion layer electrode plate of fuel cell by utilizing carbon fiber paper

Abstract

The invention relates to the field of porous diffusion layer electrode plates of fuel cells and particularly relates to a process for manufacturing the porous diffusion layer electrode plate of the fuel cell by utilizing carbon fiber paper, and the process can be used for meeting the batch industrial production needs of porous diffusion layer electrodes of the fuel cells. The process disclosed by the invention comprises the following steps of: impregnating the carbon fiber paper in a mixed solution of modified phenolic resin and epoxy resin, drying, then preparing a base plate at high temperature and high pressure, finally performing high-temperature carbonization and then preparing the porous diffusion layer electrode plate used for the fuel cell. The porous diffusion layer electrode plate after carbonization, disclosed by the invention, has the advantages of uniform porous structure, excellent gas permeability, low resistivity, high electron conduction capability, tight structure, smooth surface, a certain mechanical strength, stable chemical properties and thermal stability, and can achieve various required indexes of the porous diffusion layer electrode plate, such as the porosity is not less than 75%, the resistivity is not more than 0.05 omega.cm, and the gas diffusion coefficient is not less than 0.15cm<2>/s and the like.

Description

technical field [0001] The invention relates to the field of fuel cell porous diffusion layer electrode plates, in particular to a process for making fuel cell porous diffusion layer electrode plates using carbon fiber paper. Background technique [0002] The gas diffusion layer material plays a role in supporting the catalyst layer and stabilizing the electrode structure in the electrode. It also provides fuel gas channels, electron channels and drainage channels for the electrode reaction. The influence of different diffusion layer materials on the structure, manufacturing process and performance of the electrode They are also different. Carbon fiber paper (carbon paper), carbon cloth, non-woven fabric and carbon black paper are commonly used electrode materials. [0003] At present, carbon fiber paper (carbon paper) and carbon cloth are used for the gas diffusion layer. They not only have a uniform porous thin-layer structure, but also have good electrical conductivity, ...

AI Technical Summary

Problems solved by technology

[0010] At present, the porous diffusion layer electrode plates used in fuel cells produced in my country are all imported from abroad, most of which are imported from Japan. Only a few scientific research institutions are trial-producing carbon fiber to make fuel cell plates, but it is only in the experimental stage. Most of them are manufactured by dry method, suction molding method, and sieving method, and they have not been able to form mass industrial production, which hinders and affects my country's energy construction and environmental protection development.