Preparation process of fuel cell electrode porous diffusion layer material carbon fiber paper

Abstract

The invention relates to the field of fuel cell electrode porous diffusion layer materials, in particular to a preparation process of basic material carbon fiber paper for manufacturing fuel cell electrode porous diffusion layers. The carbon fiber paper can be produced on common paper machine production lines in a batch mode and meets the requirement for manufacture of fuel cell electrode porous diffusion layer electrodes. The preparation process comprises the steps of (1) performing surface treatment to short carbon fiber; (2) performing surface treatment to conductive carbon black; (3) smashing raw wood pulp and placing the raw wood pulp into a pulping pond, wherein the ratio of the raw wood pulp to water is 5-15%; and the like. The carbon fiber paper produced by means of the preparation process can meet the requirement for manufacture of the fuel cell electrode porous diffusion materials, can evenly support catalyst layers in electrodes and stabilizing electrode structures, further has functions of providing gas channels, electronic channels and drainage channels for electrode reaction and the like, and has porous structures, excellent gas generating performance, high conductivity, certain mechanical strength, chemical stability and heat stability.

Description

technical field

[0001] The invention relates to the field of fuel cell electrode porous diffusion layer materials, in particular to a preparation process of carbon fiber paper, a basic material for manufacturing a fuel cell electrode porous diffusion layer. 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 hav...