Fuel cell

摘要

A fuel cell equipped with at least an air electrode side power collector layer, an air electrode catalyst layer, a polymer electrolyte membrane, a fuel electrode catalyst layer and a fuel electrode side power collector layer and provided with a porous body layer having a porous body at a liquid fuel side of the fuel electrode side power collector layer assumes a structure in which the porous body layer is provided with a gas flow velocity (superficial velocity in the layer) of 10 to 5000 cm/s at a differential pressure of 100 kPa. The porous body layer is a diffusion medium of a fuel into the fuel electrode catalyst layer and a discharge resistor of gases comprising carbon dioxide and steam which are electrode reaction products and a vapor of the liquid fuel in progress of electrode reaction. An interface of the gases and a gases layer are also provided.

主权项

1. A fuel cell equipped with
at least an air electrode side power collector layer, an air electrode catalyst layer, a polymer electrolyte membrane, a fuel electrode catalyst layer and a fuel electrode side power collector layer, and provided with a porous body layer comprising a porous body at a liquid fuel side of the fuel electrode side power collector layer, wherein the porous body layer has a gas flow velocity (superficial velocity in the layer) of 10 to 5000 cm/s at a differential pressure of 100 kPa and is a diffusion medium of a fuel into the fuel electrode catalyst layer and a discharge resistor of gases comprising carbon dioxide and steam which are electrode reaction products and a vapor of the liquid fuel in progress of electrode reaction; an interface of the gases is formed in the porous body layer or on the surface of the porous body layer in progress of electrode reaction, and a gases layer comprising the gases is formed between the fuel electrode catalyst layer and the porous body layer, and further a closed space layer in which a closed space is formed at least at a fuel electrode layer side is provided between the porous body layer and the fuel electrode side power collector layer, the closed space layer having a thickness of 0.05 to 10 mm.