Hydrogen absorption in 3.1 nanometre sized palladium samples: does structure matter?
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Mohammed Suleiman
Abstract
In this work the hydrogen absorption behaviour of two types of Pd-clusters, different in structure but similar in size (3.1 nm), will be presented. First, icosahedral Pd clusters stabilised in surfactants; second, cubic Pd clusters stabilised in a Teflon-AF matrix. The phase transition in these samples was monitored by in-situ X-ray diffraction. It will be shown that the hydrogen uptake ability depends strongly on the lattice structure, which is affected by the type of stabiliser. Teflon AF stabilised clusters (cubic clusters) show the phase transition which is common for bulk Pd, whereas the surfactant stabilised clusters (icosahedral clusters) show only weak lattice dilatation upon hydrogen absorption. Pressure – lattice parameter isotherms show that the cubic clusters absorb large amounts of hydrogen in comparison to the icosahedral clusters. The measured lattice expansion is 0.130 Å at 105 Pa and 300 K, which is about 320 % the amount measured for icosahedral clusters (0.04 Å). This suggests that surface sites are available for hydrogen in the Pd – Teflon-AF samples which are not accessible for Pd – surfactant-clusters, and that the icosahedral lattice absorbs less hydrogen for similar external pressures.
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© 2008, Carl Hanser Verlag, München
Articles in the same Issue
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- Prof. Dr. Reiner Kirchheim
- Review
- Laser-assisted atom probe tomography and nanosciences
- Heusler films and multilayers: X-ray resonant magnetic scattering and polarized neutron reflectivity studies on the relation between structure and magnetism
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- Effect of Chemical Confinement on the mechanical relaxation spectra of poly(ethene-co-methacrylic acid) copolymers
- Applied
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- A subnanoscale study of the nucleation, growth, and coarsening kinetics of Cu-rich precipitates in a multicomponent Fe – Cu based steel
- Hydrogen absorption in 3.1 nanometre sized palladium samples: does structure matter?
- Ultrasonic study of short-range hydrogen ordering in Pd-hydride
- Homogeneity of mechanically alloyed nano-crystalline Fe – Cu-powders
- Formation of nickel nanoparticles in nickel – ceramic anodes during operation of solid-oxide fuel cells
- Characterisation of complex hydrides synthesised or modified by ball milling
- On the small scale character of the stress and hydrogen concentration fields at the tip of an axial crack in steel pipeline: effect of hydrogen-induced softening on void growth
- Notifications
- DGM News
Articles in the same Issue
- Contents
- Contents
- Editorial
- Prof. Dr. Reiner Kirchheim
- Review
- Laser-assisted atom probe tomography and nanosciences
- Heusler films and multilayers: X-ray resonant magnetic scattering and polarized neutron reflectivity studies on the relation between structure and magnetism
- Perovskite-type hydrides – synthesis, structures and properties
- Basic
- Interface width of immiscible layered elements
- The decomposition reaction of lithium amide studied by anelastic spectroscopy and thermogravimetry
- Migration of faceted high-angle grain boundaries in Zn
- EELS analysis of internal metal – oxide interfaces
- Effect of Chemical Confinement on the mechanical relaxation spectra of poly(ethene-co-methacrylic acid) copolymers
- Applied
- Properties of hydrogen absorption by nano-structured FeTi alloys
- A subnanoscale study of the nucleation, growth, and coarsening kinetics of Cu-rich precipitates in a multicomponent Fe – Cu based steel
- Hydrogen absorption in 3.1 nanometre sized palladium samples: does structure matter?
- Ultrasonic study of short-range hydrogen ordering in Pd-hydride
- Homogeneity of mechanically alloyed nano-crystalline Fe – Cu-powders
- Formation of nickel nanoparticles in nickel – ceramic anodes during operation of solid-oxide fuel cells
- Characterisation of complex hydrides synthesised or modified by ball milling
- On the small scale character of the stress and hydrogen concentration fields at the tip of an axial crack in steel pipeline: effect of hydrogen-induced softening on void growth
- Notifications
- DGM News