| 摘要 |
PROBLEM TO BE SOLVED: To provide a gas diffusion electrode in which a good three-phase reaction zone is formed inside a gas diffusion layer and good characteristics as a water repellent are developed by using polyphosphazene. SOLUTION: In the case that polyphosphazene is a low molecular weight liquid, a porous substrate is directly immersed in single polyphosphazene or its solution in a suitable solvent such as THF, to attach the polyphosphazene to the surface of the porous substrate for water repellent treatment. A catalyst dispersion solution is prepared by uniformly mixing polyphosphazne, carbon powder on which a catalyst such as platinum black is carried, and a solvent, and the catalyst dispersion solution is applied or relayed to the surface of the water repellent treated porous substrate, dried, and the solvent is removed to obtain a gas diffusion electrode, In the case that polyphosphazene is a high molecular weight fine powder or fibers, it is put into a solvent such as THF, stirred, and then dispersed to prepare a dispersion solution, and particles of a catalyst such as platinum black or carbon powder, on which the catalyst is carried and a polymer electrolyte are added to the dispersion solution prepared, and they are mixed uniformly to obtain a catalyst dispersion solution. |
