Patent ID: 6967039
Filing Date: 2005-11-22
Classification: H01M,Y02E,Y02T,Y10T

Abstract:
1. A process for fabricating diffusion media, said process comprising: providing a diffusion media substrate comprising a porous fibrous matrix defining first and second major faces, wherein said substrate is free of fluorinated polymers and comprises an amount of carbonaceous material sufficient to render said substrate electrically conductive; applying a mesoporous layer along at least a portion of one of said first and second major faces of said substrate to define a region carrying said mesoporous layer and regions outside of said mesoporous layer, wherein said mesoporous layer is applied to said fluorinated polymer free substrate by providing a coating comprising a hydrophobic component, a hydrophilic component, and a pore forming agent, and said regions outside of said mesoporous layer are free of fluorinated polymers; and decomposing said pore forming agent such that said mesoporous layer is characterized by a porosity greater than a porosity of said diffusion media substrate.