| 摘要 |
PURPOSE:To provide a fuel cell junction body capable of enhancing gas diffusion capability, making exhaust water control of excess water easy, and preventing cell performance drop caused by concentration polarization. CONSTITUTION:A junction body 1 of a fuel cell comprises an electrolyte film 2, a catalytic reaction layer 3 whose main component is carbon particles on which catalysts are carried, and a gas diffusion layer 4 made of carbon particles and water repellent resin, formed by sticking carbon short fibers at least on the surface on the opposite side to the catalytic reaction layer 3 in the state intertwined with the carbon particles. In the junction body 1, since the conductive carbon fibers intertwined each other cover the surface of the gas diffusion layer 4, an electrode can be made thin with conductivity with a separator (current collector) 14 ensured, strength of the gas diffusion layer 4 ensured, the catalytic reaction layer 3 protected without use of an electrode substrate such as carbon cloth and carbon paper. Therefore, gas diffusion capability and excess water exhausting capability are enhanced and high rate performance is improved. |
