GAS DIFFUSION ELECTRODE AND SOLID-STATE HIGH-MOLECULAR ELECTROLYTE TYPE FUEL CELL

摘要

A gas diffusion electrode includes: an electrode catalyst layer (13); porous layers (11, 12) arranged on the electrode catalyst layer (13) and including at least two layers: a second porous layer (12) and a first porous layer (11) formed from materials having different water repellencies, wherein the second porous layer (12) arranged at the side of the electrode catalyst layer (13) has a higher water repellency than the first porous layer (11); and oxidizer gas diffusion substrate (10) arranged on the porous layers (11, 12) and formed by carbon fiber. According to the gas diffusion electrode, it is possible to improve the water repellency of the generated water from the electrode catalyst layer to the gas diffusion layer, the moisture retention and the gas diffusion characteristic of the electrode catalyst layer. Moreover, a solid-state high-molecular electrolyte type fuel cell enables stable electricity generation characteristic even under an operation condition of a wide humidity range and a wide current density region.