DIRECT METHANOL FUEL CELL MEMBRANE ELECTRODE FOR IMPROVING CATALYST UTILIZATION AND PREPARATION METHOD THEREOF

摘要

#$%^&*AU2020101412A420200910.pdf#####14 ABSTRACT The present invention discloses a direct methanol fuel cell (DMFC) membrane electrode capable of improving catalyst utilization and a preparation method thereof, and relates to the technical field of fuel cells. In the fuel cell membrane electrode prepared by the method of 5 the present invention, the microporous layer has a bilayer structure, including an outer microporous layer with hydrophobic polymers and an inner microporous layer with protonconductive polymers. The microporous bilayer structure, with extremely-large three-phase reaction interface and electrochemical reaction area, can effectively reduce the material transport resistance inside the electrode and remarkably improves the catalyst utilization, 0 thereby enhancing the electrode discharge performance and extending the battery life. As determined by a single-cell performance test, the membrane electrode prepared by the preparation method of the present invention has significantly-improved monomer performance compared to a membrane electrode prepared by a conventional method. 51/6 1 2 3 4 5 6 3 2 1 FIG. 1 Slurry including hydrophobic Gas diffusion layer polymers and carbon powder Spra h sluronthegasdusionlayer Slurry including proton-conductive polymers and then dry and sinter and carbon powder Gas diffusion layer with an outer microporous layer prry rry on theCsur ae ofthe (atalyst slurry outer diffusion layer Gas diffusion layer ith a microporous bilayer structure Spraythe slurry on the suraee of the inner diffusion layer I Microporous bilayer electrode FIG. 2