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  • Yagi, Shinya  (3)
  • Engineering  (3)
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  • Engineering  (3)
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  • 1
    Online Resource
    Online Resource
    XAFS and XPS study of hydro‐/dehydrogenation reaction of Mg–Pd nanoparticles
    Wiley ; 2014
    In:  Surface and Interface Analysis Vol. 46, No. 12-13 ( 2014-12), p. 1143-1146
    Details
    In: Surface and Interface Analysis, Wiley, Vol. 46, No. 12-13 ( 2014-12), p. 1143-1146
    Abstract: The nanoparticles composed of Mg and Pd atoms (Mg–Pd NPs) have been fabricated by the gas evaporation method, and the variation of the chemical state during hydro‐/dehydrogenations has been investigated by X‐ray photoelectron spectroscopy (XPS) and in‐situ X‐ray absorption fine structure (XAFS) analyses. Both XPS and XAFS spectra have indicated that the Mg–Pd NPs contain the chemical state of the metallic Pd and Mg–Pd alloy phases. The Mg–Pd alloy phase has been identified as MgPd and Mg 6 Pd by the Pd K‐edge EXAFS analysis. The hydrogen release of the Mg–Pd NPs has not been observed after first hydrogenation due to the migration of Mg toward the surface of the Mg–Pd NPs during the hydrogen storage. This irreversible migration has led the inhibition of the hydrogen diffusion into the surface from the inside of the Mg–Pd NPs. Copyright © 2014 John Wiley & Sons, Ltd.
    Type of Medium: Online Resource
    ISSN: 0142-2421 , 1096-9918
    URL: Issue
    URL: Article
    DOI: 10.1002/sia.v46.12-13
    DOI: 10.1002/sia.5647
    RVK:
    ZG 1100
    Language: English
    Publisher: Wiley
    Publication Date: 2014
    detail.hit.zdb_id: 2023881-2
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Surface chemical states of gold nanoparticles prepared using the solution‐plasma method in a CsCl aqueous solution
    Wiley ; 2019
    In:  Surface and Interface Analysis Vol. 51, No. 1 ( 2019-01), p. 85-88
    Details
    In: Surface and Interface Analysis, Wiley, Vol. 51, No. 1 ( 2019-01), p. 85-88
    Abstract: In this study, gold nanoparticles (AuNPs) prepared in a 5 mM CsCl aqueous solution using the solution‐plasma method are characterized via transmission electron microscopy (TEM) and X‐ray photoelectron spectroscopy with synchrotron radiation (SR‐XPS). The particle diameter is measured over the process time via TEM. During the solution‐plasma process, small particles of 2.1 to 2.2‐nm diameter are generated in the CsCl aqueous solution; these particles then enlarge via Ostwald ripening over time until they reach an equilibrium size of ~13 nm after 36 days. In addition, the surface chemical states of the AuNPs are characterized at different depths via SR‐XPS. The SR‐XPS measurements obtained using incident X‐ray energy ( hν ) of 945.0 eV revealed that Cs─Au, Cl─Au, and Cs─Cl─Au bonds are present 1.2 nm below the surface. The measurements obtained at an incident X‐ray energy of 2515.0 eV showed that Cs─Cl─Au bonding is also present 2.5 nm below the surface, indicating that Cs and Cl strongly interact with Au. The TEM and SR‐XPS measurements revealed that 2 processes occur cyclically during the growth process via Ostwald ripening: (i) the Cs and Cl in the aqueous solution adsorb on the AuNP surface and (ii) Au atoms subsequently bond to the AuNPs surface.
    Type of Medium: Online Resource
    ISSN: 0142-2421 , 1096-9918
    URL: Issue
    URL: Article
    DOI: 10.1002/sia.v51.1
    DOI: 10.1002/sia.6555
    RVK:
    ZG 1100
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2023881-2
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  • 3
    Online Resource
    Online Resource
    Hydrogen storage property of Ni nanoparticles fabricated by the gas evaporation method
    Wiley ; 2014
    In:  Surface and Interface Analysis Vol. 46, No. 12-13 ( 2014-12), p. 1121-1124
    Details
    In: Surface and Interface Analysis, Wiley, Vol. 46, No. 12-13 ( 2014-12), p. 1121-1124
    Abstract: We have fabricated the Ni nanoparticles with a clean surface by the gas evaporation method and clarified the hydrogen storage property by using atomic force microscope (AFM), X‐ray photoelectron spectroscopy (XPS) and quartz crystal microbalance (QCM) measurements. The diameter has been estimated as 4.0 ± 1.5 nm by AFM observation. The Ni nanoparticles possess a clean surface, because the surface chemical state has been confirmed as mainly metallic state by XPS. The hydrogen storage property has been investigated by QCM from the vacuum to the atmospheric pressure of the hydrogen at 300 K. The plateau pressure of the Ni nanoparticles and a maximum hydrogen storage capacity are about 7 Torr and H/Ni = 0.56, respectively. And the hydrogen release from the Ni nanoparticles has not been observed by QCM. The hydrogen adsorption/desorption reaction have also been observed as the plateau like pressure by QCM. These results indicate that (i) the plateau pressure of Ni is decreased by the nanosizing of the material, (ii) the large specific surface area of the Ni nanoparticles makes it possible to observe the adsorption/desorption reaction and (iii) the Ni hydride is stable under the vacuum condition. The chemical shift of Ni 2p 3/2 has not been observed in the XPS spectrum between before and after exposure to the hydrogen. This result implies that there is no strong chemical bonding between Ni and hydrogen or the hydrogen in the lateral surface has been released. Copyright © 2014 John Wiley & Sons, Ltd.
    Type of Medium: Online Resource
    ISSN: 0142-2421 , 1096-9918
    URL: Issue
    URL: Article
    DOI: 10.1002/sia.v46.12-13
    DOI: 10.1002/sia.5566
    RVK:
    ZG 1100
    Language: English
    Publisher: Wiley
    Publication Date: 2014
    detail.hit.zdb_id: 2023881-2
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
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