| 摘要 |
It is intended to provide a porous membrane comprising a film or sheet made of a polymer or inorganic material, characterized by having a large number of pores of 0.1 to 100 mum in pore size formed by irradiation with an ultra-short pulse laser with a pulse width of 10-9 seconds or less at an output power of 0.001 to 10 W at focal position, and to provide a polymer electrolyte membrane having the pores that are filled with a polymer electrolyte. This polymer electrolyte membrane can be prepared as a thin membrane and is highly durable with high strength and a reduced cross-leak of fuel gas. This porous membrane can be used as a solid polymer electrolyte membrane to obtain a fuel cell improved in output voltage and electric current density.
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