等离子体改性碳纤维纸在燃料电池气体扩散层中的应用OA

Aqueous phenolic resin often poorly wets carbon fibers due to its physicochemical proper-ties,leading to non-uniform impregnation.This study applied plasma hydrophilic modification to car-bon fiber paper.Morphology,resin distribution,pores,and performance were systematically charac-terized.The results show that the resin distributes more uniformly after modification,effectively fill-ing large pores.The pore distribution shifts from a broad peak around 50 μm to a narrow single peak within the 20-50 μm range,forming a superior conductive network.The through-plane resistivity de-creases from 6.4 mΩ·cm2 to 5.3 mΩ·cm²,and the in-plane resistivity decreases from 15.7 mΩ·cm to 11.4 mΩ·cm.Compressive strength increases significantly(stress at 20%strain reaches 1.32 times that of the untreated sample).Although the air permeability decreased from 178 cm3/(cm2·s)to 94 cm3/(cm2·s),this change reflects essential improvements in impregnation uniformity and pore struc-ture.Single-cell tests demonstrate simultaneous reduction of ohmic and mass transfer polarizations,with the limiting current density increasing from 2.4 A/cm2 to 3.0 A/cm2.This process provides an ef-fective solution for producing high-performance GDLs using aqueous resin.