Conductive carbon paper and preparation method thereof

Abstract

The invention belongs to the technical field of conductive material preparation methods, and particularly relates to conductive carbon paper and a preparation method thereof. The conductive carbon paper is composed of 2-10 layers of single-layer carbon fiber paper with porosity of 10-80%, wherein the porosity of the single-layer carbon fiber paper on the outermost side is denoted as A, the porosity of the single-layer carbon fiber paper on the outermost side of the other side is denoted as B, the unit of A and B is%, the total thickness of the conductive carbon paper is denoted as L, the unitof L is [mu] m, and the three should meet the following relationship: 0.2 < = | A-B | / L < = 0.8. A mixture containing a dispersing agent, chopped carbon fibers and carbon nanofibers is put into waterand pulped to uniformly disperse the carbon fibers and the carbon nanofibers to form a suspension; the suspension is manufactured by adopting a conventional wet papermaking technology to form carbon fiber base paper and soaked in a binder, dried, and carbonized to obtain the conductive carbon paper.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of conductive materials, and in particular relates to a conductive carbon paper and a preparation method thereof. Background technique [0002] The gas diffusion layer of a proton exchange membrane hydrogen fuel cell needs to have functions such as current collection, gas transmission, and gas distribution. Therefore, the carbon fiber paper layer material constituting the gas diffusion layer is required to have properties such as high electrical conductivity, high gas diffusibility, and high gas distribution property at the same time. [0003] As carbon paper for the gas diffusion layer of a proton exchange membrane fuel cell, Japanese Laid-Open Patent No. 6-20710 discloses that chopped carbon fibers are randomly dispersed to form carbon fiber paper, and then combined with carbon materials to form a porous structure. Carbon fiber paper material. However, it is difficult for the carbo...

AI Technical Summary

Problems solved by technology

However, in traditional electrode substrates, in order to improve the gas transport performance, the porosity of the carbon paper is increased, making the surface of the carbon paper rough and poorly bonded to the catalyst layer.

Images