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*; *; Kasai, Noboru; Seguchi, Tadao; Okamura, K.*
High-Temperature Ceramic-Matrix Composites II (HT-CMC2), 0, p.281 - 286, 1995/00
no abstracts in English
Ota, Tomonori*; Hagiwara, Tokio*; Sugimoto, Masaki; Yamamoto, Shunya; Koshikawa, Hiroshi; Yamaki, Tetsuya
no journal, ,
Nitrogen (N)-doped carbon-based electrocatalysts are expected as a platinum alternative material for cost reduction of polymer electrolyte membrane fuel cells. However, nobody has not yet established the method of introducing N atoms in a graphene structure at high concentrations. Therefore, our purpose is to propose a new method of N doping using electron beam irradiation at high temperatures in an ammonia atmosphere. We developed here a sample chamber with a heating device, gas inlet and outlet, which made it possible to perform the irradiation without any temperature change. As a result, the phenolic resin, that is, a source of carbon-based electrocatalysts was irradiated with 2 MeV electrons at a dose rate of 2 kGy/s while being maintained at 300 
C with a high precision as 
2 C.
Ota, Tomonori*; Yamaki, Tetsuya; Sugimoto, Masaki; Yamamoto, Shunya; Koshikawa, Hiroshi; Hagiwara, Tokio*
no journal, ,
Nitrogen-doped carbon-based catalysts are expected as Pt alternatives, and however there have been so far no established methods to introduce N atoms into graphene structures. Thus, we report N doping in carbon-based catalysts by electron beam (EB) irradiation in ammonia (NH
). A precursor was phenolic resin or its mixture with 5 or 10 wt% cobalt(II) chloride (CoCl
); it was then irradiated with 2 MeV electron beam up to a dose of 6 MGy in 1 vol% NH at 400C. This irradiated powder was carbonized in an Ar atmosphere at 800C for 1 h. An N-doping level reached an atomic concentration of ca. 0.5% when 5 wt% CoCl was mixed in the precursor.
Sugimoto, Masaki; Ota, Tomonori*; Yamamoto, Shunya; Koshikawa, Hiroshi; Yamaki, Tetsuya; Hagiwara, Tokio*
no journal, ,
no abstracts in English
