Gas diffusion layer and process for production thereof, and fuel cell

摘要

An object of the present invention is to provide a gas diffusion layer having gas flow passages formed at its one main surface, which is capable of achieving a further improvement in power generation performance. The fuel cell-use gas diffusion layer (14A, 14C) of the present invention has a double-layer structure made up of a first diffusion layer (15A, 15C) having gas flow passages (21A, 21C) at its one main surface, and a second diffusion layer (16A, 16C) disposed on the other main surface of the first diffusion layer. The first diffusion layer and the second diffusion layer are each structured with a porous member mainly comprised of conductive particles and a polymer resin, and the first diffusion layer is structured to be lower in porosity than the second diffusion layer.

主权项

1. A gas diffusion layer used for fuel cell, wherein
the gas diffusion layer has a double-layer structure made up of a first diffusion layer and a second diffusion layer, the first diffusion layer having a gas flow passage formed at one main surface of the first diffusion layer, and the second diffusion layer being stacked on an other main surface of the first diffusion layer, the first and second diffusion layers are each structured with a porous member mainly comprised of conductive particles and a polymer resin, with carbon fibers added by a weight smaller than a weight of the polymer resin, the first diffusion layer is lower in a porosity than the second diffusion layer, and the first diffusion layer is higher in a composition ratio of the carbon fibers than the second diffusion layer.