CARBON-FIBER NONWOVEN CLOTH AND GAS DIFFUSION ELECTRODE FOR POLYMER ELECTROLYTE FUEL CELL USING SAME POLYMER ELECTROLYTE FUEL CELL METHOD FOR MANUFACTURING CARBON-FIBER NONWOVEN CLOTH AND COMPOSITE SHEET

摘要

The present invention provides a carbon fiber nonwoven fabric having a low resistance in passing gases or liquids and having a small resistance in the thickness direction of heat or electricity, particularly a carbon fiber nonwoven fabric suitable for gas diffusion electrodes of solid polymer type fuel cells will, have a pore diameter of more than 20μm, and at least a portion of the continuous carbon fiber to the other surface from one surface thereof, the apparent density is more than 0.2 and has a 1.g / cm ³ is a carbon fiber non-woven fabric, or pore diameter of 20μm, at least A part of the carbon fibers are entangled with each other and at least a part of the carbon fibers are oriented in the thickness direction and an apparent density is 0.2 to 1.0 g / cm ³ .