| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a carbon fiber sheet in which reaction efficiency of hydrogen and oxygen is improved, water holding ability of a polymer electrolyte film can be obtained, deterioration of the electrolytic film can be prevented, and battery performance can be improved, when used as an electrode for a polyelectrolyte fuel cell. <P>SOLUTION: In this carbon fiber sheet, carbon fibers and activated carbon fibers are mixed, or the carbon fibers are mixed with the activated carbon fibers having a specific surface area of 500 to 2,500 m<SP>2</SP>/g and a carbonizable binder, and the specific surface area is made as 15 to 350 m<SP>2</SP>/g, thickness as 0.1 to 0.7 mm, an electrical resistance value in the thickness direction as 6 mΩ or less, and bulk density as 0.16 to 0.40 g/cm<SP>3</SP>. Or, the carbon fiber sheet is formed since the carbon fibers or oxidized fibers, the activated carbon fibers having the specific surface area of 500 to 2,500 m<SP>2</SP>/g, and the carbonizable binder are mixed, and the carbon fiber sheet is carbonized in inert gas atmosphere under temperature of 950 to 1,550°C. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
