Abstract
Hydrogen permeation tests were carried out on ultrafine-grained palladium processed by high-pressure torsion (HPT) and the results were compared with those on an annealed coarse-grained state. It is shown that hydrogen diffusion is similar above 200 C but is enhanced at temperatures below 200 C in the ultrafine-grained state. All samples were subjected to X-ray diffraction analyses after the hydrogen permeation tests. It is shown that hydride formation occurs at lower temperatures in both coarse- and ultrafine-grained states but the hydride formation temperature is reduced to a lower temperature in the ultrafine-grained state. This study suggests that grain boundaries of palladium act as diffusion pass but not as the sites for hydride formation.
| Original language | English |
|---|---|
| Pages (from-to) | 14879-14886 |
| Number of pages | 8 |
| Journal | International Journal of Hydrogen Energy |
| Volume | 38 |
| Issue number | 34 |
| DOIs | |
| Publication status | Published - Nov 13 2013 |
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All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Fuel Technology
- Condensed Matter Physics
- Energy Engineering and Power Technology
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Hydrogen behavior in ultrafine-grained palladium processed by high-pressure torsion. / Iwaoka, Hideaki; Horita, Zenji.
In: International Journal of Hydrogen Energy, Vol. 38, No. 34, 13.11.2013, p. 14879-14886.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Hydrogen behavior in ultrafine-grained palladium processed by high-pressure torsion
AU - Iwaoka, Hideaki
AU - Horita, Zenji
PY - 2013/11/13
Y1 - 2013/11/13
N2 - Hydrogen permeation tests were carried out on ultrafine-grained palladium processed by high-pressure torsion (HPT) and the results were compared with those on an annealed coarse-grained state. It is shown that hydrogen diffusion is similar above 200 C but is enhanced at temperatures below 200 C in the ultrafine-grained state. All samples were subjected to X-ray diffraction analyses after the hydrogen permeation tests. It is shown that hydride formation occurs at lower temperatures in both coarse- and ultrafine-grained states but the hydride formation temperature is reduced to a lower temperature in the ultrafine-grained state. This study suggests that grain boundaries of palladium act as diffusion pass but not as the sites for hydride formation.
AB - Hydrogen permeation tests were carried out on ultrafine-grained palladium processed by high-pressure torsion (HPT) and the results were compared with those on an annealed coarse-grained state. It is shown that hydrogen diffusion is similar above 200 C but is enhanced at temperatures below 200 C in the ultrafine-grained state. All samples were subjected to X-ray diffraction analyses after the hydrogen permeation tests. It is shown that hydride formation occurs at lower temperatures in both coarse- and ultrafine-grained states but the hydride formation temperature is reduced to a lower temperature in the ultrafine-grained state. This study suggests that grain boundaries of palladium act as diffusion pass but not as the sites for hydride formation.
UR - http://www.scopus.com/inward/record.url?scp=84886723600&partnerID=8YFLogxK
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U2 - 10.1016/j.ijhydene.2013.08.098
DO - 10.1016/j.ijhydene.2013.08.098
M3 - Article
AN - SCOPUS:84886723600
VL - 38
SP - 14879
EP - 14886
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
SN - 0360-3199
IS - 34
ER -