Measuring method of the specific surface area available for reac

Details Measuring method of the specific surface area available for reac Measuring method of the specific surface area available for reac

1997-01-15

1999-02-02

Alexander, Lyle A.

Chemistry: analytical and immunological testing

Process or composition for determination of physical state...

Surface area, porosity, imperfection, or alteration

73 181, 429 40, G01N 1508

Patent

active

058664238

ABSTRACT:
A measuring method for determining the specific surface area available for reaction of a noble metal catalyst of an electrode for use in a polymer electrolyte membrane fuel cell. The method includes measuring the total specific surface area of the noble metal catalyst and the specific surface area of the noble metal catalyst mixed with a polymer electrolyte by detecting the adsorption amounts of carbon monoxide upon exposure to carbon monoxide after reduction in hydrogen, and subtracting the latter from the former. Also provided is an electrode material for use in a polymer electrolyte membrane fuel cell having excellent polarization characteristics by controlling the utilization of a noble metal catalyst determined from the total specific surface area and specific surface area available for reaction of the noble metal catalyst. The electrode material includes a noble metal catalyst powder and a polymer electrolyte, wherein the utilization ratio of the noble metal catalyst is at least 40% of the saturation value of the utilization of the noble metal catalyst powder.

REFERENCES:
patent: 3944390 (1976-03-01), Lieber

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