Mechanism of activation of TiFe intermetallics for hydrogen storage by severe plastic deformation using high-pressure torsion

Kaveh Edalati; Junko Matsuda; Makoto Arita; Takeshi Daio; Etsuo Akiba; Zenji Horita

doi:10.1063/1.4823555

Mechanism of activation of TiFe intermetallics for hydrogen storage by severe plastic deformation using high-pressure torsion

Kaveh Edalati, Junko Matsuda, Makoto Arita, Takeshi Daio, Etsuo Akiba, Zenji Horita

Research output: Contribution to journal › Article › peer-review

83 Citations (Scopus)

Abstract

TiFe, a potential candidate for solid-state hydrogen storage, does not absorb hydrogen without a sophisticated activation process because of severe oxidation. This study shows that nanostructured TiFe becomes active by high-pressure torsion (HPT) and is not deactivated even after storage for several hundred days in the air. Surface segregation and formation of Fe-rich islands and cracks occur after HPT. The Fe-rich islands are suggested to act as catalysts for hydrogen dissociation and cracks and nanograin boundaries act as pathways to transport hydrogen through the oxide layer. Rapid atomic diffusion by HPT is responsible for enhanced surface segregation and hydrogen transportation.

Original language	English
Article number	143902
Journal	Applied Physics Letters
Volume	103
Issue number	14
DOIs	https://doi.org/10.1063/1.4823555
Publication status	Published - Sept 30 2013

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

Access to Document

10.1063/1.4823555

Cite this

@article{3abd219ddd91468d95a4954b2f641f74,

title = "Mechanism of activation of TiFe intermetallics for hydrogen storage by severe plastic deformation using high-pressure torsion",

abstract = "TiFe, a potential candidate for solid-state hydrogen storage, does not absorb hydrogen without a sophisticated activation process because of severe oxidation. This study shows that nanostructured TiFe becomes active by high-pressure torsion (HPT) and is not deactivated even after storage for several hundred days in the air. Surface segregation and formation of Fe-rich islands and cracks occur after HPT. The Fe-rich islands are suggested to act as catalysts for hydrogen dissociation and cracks and nanograin boundaries act as pathways to transport hydrogen through the oxide layer. Rapid atomic diffusion by HPT is responsible for enhanced surface segregation and hydrogen transportation.",

author = "Kaveh Edalati and Junko Matsuda and Makoto Arita and Takeshi Daio and Etsuo Akiba and Zenji Horita",

note = "Funding Information: One of the authors (K.E.) thanks the Japan Society for Promotion of Science (JSPS) for providing a grant under the title of “Development of Hydrogen Storage Alloys Using Giant Straining Process” (Grant No. 22.0080). This work was supported in part by WPI-I2CNER, in part by the Light Metals Educational Foundation of Japan, in part by a Grant-in-Aid for Scientific Research from the MEXT, Japan, in Innovative Areas “Bulk Nanostructured Metals” (Grant No. 22102004).",

year = "2013",

month = sep,

day = "30",

doi = "10.1063/1.4823555",

language = "English",

volume = "103",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics Publising LLC",

number = "14",

}

TY - JOUR

T1 - Mechanism of activation of TiFe intermetallics for hydrogen storage by severe plastic deformation using high-pressure torsion

AU - Edalati, Kaveh

AU - Matsuda, Junko

AU - Arita, Makoto

AU - Daio, Takeshi

AU - Akiba, Etsuo

AU - Horita, Zenji

N1 - Funding Information: One of the authors (K.E.) thanks the Japan Society for Promotion of Science (JSPS) for providing a grant under the title of “Development of Hydrogen Storage Alloys Using Giant Straining Process” (Grant No. 22.0080). This work was supported in part by WPI-I2CNER, in part by the Light Metals Educational Foundation of Japan, in part by a Grant-in-Aid for Scientific Research from the MEXT, Japan, in Innovative Areas “Bulk Nanostructured Metals” (Grant No. 22102004).

PY - 2013/9/30

Y1 - 2013/9/30

N2 - TiFe, a potential candidate for solid-state hydrogen storage, does not absorb hydrogen without a sophisticated activation process because of severe oxidation. This study shows that nanostructured TiFe becomes active by high-pressure torsion (HPT) and is not deactivated even after storage for several hundred days in the air. Surface segregation and formation of Fe-rich islands and cracks occur after HPT. The Fe-rich islands are suggested to act as catalysts for hydrogen dissociation and cracks and nanograin boundaries act as pathways to transport hydrogen through the oxide layer. Rapid atomic diffusion by HPT is responsible for enhanced surface segregation and hydrogen transportation.

AB - TiFe, a potential candidate for solid-state hydrogen storage, does not absorb hydrogen without a sophisticated activation process because of severe oxidation. This study shows that nanostructured TiFe becomes active by high-pressure torsion (HPT) and is not deactivated even after storage for several hundred days in the air. Surface segregation and formation of Fe-rich islands and cracks occur after HPT. The Fe-rich islands are suggested to act as catalysts for hydrogen dissociation and cracks and nanograin boundaries act as pathways to transport hydrogen through the oxide layer. Rapid atomic diffusion by HPT is responsible for enhanced surface segregation and hydrogen transportation.

UR - http://www.scopus.com/inward/record.url?scp=84885648001&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84885648001&partnerID=8YFLogxK

U2 - 10.1063/1.4823555

DO - 10.1063/1.4823555

M3 - Article

AN - SCOPUS:84885648001

SN - 0003-6951

VL - 103

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 14

M1 - 143902

ER -

Mechanism of activation of TiFe intermetallics for hydrogen storage by severe plastic deformation using high-pressure torsion

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this