Preparation of Gas Diffusion Carbon Paper and Its Uniformity Analysis

Gas diffusion layer of carbon paper plays the role of supporting catalyst layer,stabilizing the electrode structure and offering the gas-water channel,which is the key component of PEMFC.But the key technology of high performance carbon paper is held by Europe,the United States and other countries,it restricts the development of PEMFC technology in China.The effect of the different ratio of carbon fiber on the paper strength and electrical conductivity were studied,the influence of dispersant on the carbon fiber dispersion was investigated by the absorbance method,resistance detection and deviation of tensile strength.The results showed that the ratio of carbon fiber had a great effect on strength and electrical conductivity of carbon paper,the carbon fiber ratio from 70% to 80% to prepare carbon paper was appropriate.PAAS and CPAM had the same trend on the effect of carbon fiber dispersion,CPAM was relatively better.The analysis results of three detection methods to present the dispersion uniformity were basically identical and credible.