Radiation Induced Synthesis of Tin-based Nanoparticles and Investigation of the Generating Mechanism

Shinyoshi, Naoki; Seino, Satoshi; Uegaki, Naoto; Fujieda, Shun; Uetake, Yuta; Nakagawa, Takashi

doi:10.3769/radioisotopes.71.171

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Characterization Of Gamma-ray Irradiated Samples1

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2023

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“…A previous study on the synthesis of Sn nanoparticles [E°( Sn 2+ /Sn) = ¹0.14 V] by irradiation reported that Sn metal nanoparticles supported on a surface carbon support were oxidized to SnO 2 . 10), 11) The Nb nanoparticles obtained in this study were assumed to exist in the same state.…”

Section: Characterization Of Gamma-ray Irradiated Samplesmentioning

confidence: 99%

Radiation-induced synthesis of carbon-supported niobium oxide nanoparticle catalysts and investigation of heat treatment conditions to improve the oxygen reduction reaction activity

Shinyoshi,

Seino,

Uetake

et al. 2023

J. Ceram. Soc. Japan

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Carbon-supported niobium oxide nanoparticle catalysts were synthesized for the oxygen reduction reaction (ORR) in acidic media. These catalysts were prepared using a 60 Co gamma-ray and heat-treated with polyacrylonitrile. Carbon black powder or multi-walled carbon nanotube (CNT) was used as the support for the niobium nanoparticle. Nb 2 O 5 nanoparticles with low crystallinity were fine and well dispersed on the carbon support in the as-irradiated samples. The loading amount of niobium increased with the absorbed dose, which indicated that niobium nanoparticles were produced by the irradiation. The as-irradiated composite nanoparticles were heat-treated under an H 2 atmosphere (5 %) or a mixed atmosphere of H 2 (2 %) and O 2 (0.05 %) to introduce active sites. The ORR activities were significantly enhanced by the heat treatment. Furthermore, the ORR activities were improved by using multi-walled CNT as the support.

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Section: Characterization Of Gamma-ray Irradiated Samplesmentioning

confidence: 99%