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AssigneesNippon Steel & Sumitomo Metal Corporation, Nippon Steel & Sumikin Chemical Co., Ltd.
InventorsTakashi IIJIMA, Masataka HIYOSHI, Katsumasa MATSUMOTO, Hiroyuki HAYASHIDA, Kazuhiko MIZUUCHI, Takumi KOUNO, Masakazu HIGUCHI, Masakazu KATAYAMA
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Provided are: a supporting carbon material for a solid polymer fuel cell, said supporting carbon material making it possible to produce a high-performance solid polymer fuel cell in which there is little decrease in power generation performance as a result of repeated battery load fluctuation that inevitably occurs during operation of the solid polymer fuel cell; and a catalyst metal particle-supporting carbon material. The present invention relates to: a supporting carbon material for a solid polymer fuel cell, said supporting carbon material being a porous carbon material in which the specific surface area of mesopores having a pore diameter of 2-50 nm according to nitrogen adsorption measurement is 600-1,600 m2/g, the relative intensity ratio (IG′/IG) of the peak intensity (IG′) of the G-band 2,650-2,700 cm−1 range to the peak intensity (IG) of the G-band 1,550-1,650 cm−1 range in the Raman spectrum is 0.8-2.2, and the peak position of the G′-band is 2,660-2,670 cm−1; and a catalyst metal particle-supporting carbon material.
A supporting carbon material for a solid polymer fuel cell comprised of a porous carbon material having a specific surface area SA of mesopores of a pore size of 2 to 50 nm, found by analyzing a nitrogen adsorption isotherm of an adsorption process by the Dollimore-Heal method, of 600 m2/g to 1600 m2/g, having a relative intensity ratio (IG′/IG) of a peak intensity (IG′) of a peak present in the G′-band of 2650 to 2700 cm−1 in range at a Raman spectrum and a peak intensity (IG) of a peak present in the G-band of 1550 to 1650 cm−1 of 0.8 to 2.2, and having a peak position of the G′-band of 2660 to 2670 cm−1.
The supporting carbon material for a solid polymer fuel cell according to claim 2 wherein in said mesopores, mesopores with a pore size of 2 nm to less than 10 nm have a specific pore area S2-10 of 400 m2/g to 1100 m2/g, mesopores with a pore size of 2 nm to less than 10 nm have a specific pore volume V2-10 of 0.4 cc/g to 1.6 cc/g, and mesopores with a pore size of 10 nm to 50 nm have a specific pore area S10-50 of 20 m2/g to 150 m2/g, and micropores of a pore size of less than 2 nm, found by analyzing a nitrogen adsorption isotherm of an adsorption process by the Horvath-Kawazoe method, have a pore area S2 of 250 m2/g to 550 m2/g.
Dependencies are inferred from the claim text.