Hydrogenation reaction of Co3Ti alloy under high pressure and high temperature

Hiroyuki Saitoh; Masahiro Morimoto; Tetsu Watanuki; Toyoto Sato; Shigeyuki Takagi; Shin ichi Orimo

doi:10.1016/j.ijhydene.2020.06.027

Hydrogenation reaction of Co₃Ti alloy under high pressure and high temperature

Hiroyuki Saitoh, Masahiro Morimoto, Tetsu Watanuki, Toyoto Sato, Shigeyuki Takagi, Shin ichi Orimo

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

1 Citation (Scopus)

Abstract

To synthesize a novel titanium-containing hydride, a Co₃Ti alloy with a Cu₃Au-type structure was hydrogenated at 9 GPa and 900 °C. Structural changes under high pressure were monitored via in situ synchrotron radiation x-ray diffraction at BL14B1, SPring-8. The in-situ measurement reveals that novel hydride Co₃TiH_~4 is formed at 9 GPa and 900 °C. When the sample was depressurized at room temperature, the formed hydride decomposed to (the previously reported) Co₃TiH_~1 at a pressure of ~1 GPa. Co₃TiH_~1 was recovered at ambient conditions and decomposed gradually into the Co₃Ti alloy. Co₃TiH_~4 is thermodynamically stable only at pressures above 1 GPa.

Original language	English
Pages (from-to)	33675-33680
Number of pages	6
Journal	International Journal of Hydrogen Energy
Volume	45
Issue number	58
DOIs	https://doi.org/10.1016/j.ijhydene.2020.06.027
Publication status	Published - 2020 Nov 27

Keywords

CoTiH
High pressure
Hydride
Synchrotron radiation x-ray

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.ijhydene.2020.06.027

Cite this

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title = "Hydrogenation reaction of Co3Ti alloy under high pressure and high temperature",

abstract = "To synthesize a novel titanium-containing hydride, a Co3Ti alloy with a Cu3Au-type structure was hydrogenated at 9 GPa and 900 °C. Structural changes under high pressure were monitored via in situ synchrotron radiation x-ray diffraction at BL14B1, SPring-8. The in-situ measurement reveals that novel hydride Co3TiH~4 is formed at 9 GPa and 900 °C. When the sample was depressurized at room temperature, the formed hydride decomposed to (the previously reported) Co3TiH~1 at a pressure of ~1 GPa. Co3TiH~1 was recovered at ambient conditions and decomposed gradually into the Co3Ti alloy. Co3TiH~4 is thermodynamically stable only at pressures above 1 GPa.",

keywords = "CoTiH, High pressure, Hydride, Synchrotron radiation x-ray",

author = "Hiroyuki Saitoh and Masahiro Morimoto and Tetsu Watanuki and Toyoto Sato and Shigeyuki Takagi and Orimo, {Shin ichi}",

note = "Funding Information: The synchrotron radiation experiments were performed using a QST experimental station at the QST beamline BL14B1, SPring-8, with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2014A3614, 2015A3602, and 2015B3602). This work was supported by Grants-in-Aid for Scientific Research (KAKENHI) (Grant Nos. JP18H05513) from the Japan Society for the Promotion of Science as well as grants from the Inter-University Cooperative Research Program of the Institute for Materials Research, Tohoku University (Proposal Nos. 17K0026, 18K0032 , and 19K0049 ). Publisher Copyright: {\textcopyright} 2020 Hydrogen Energy Publications LLC",

year = "2020",

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doi = "10.1016/j.ijhydene.2020.06.027",

language = "English",

volume = "45",

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T1 - Hydrogenation reaction of Co3Ti alloy under high pressure and high temperature

AU - Saitoh, Hiroyuki

AU - Morimoto, Masahiro

AU - Watanuki, Tetsu

AU - Sato, Toyoto

AU - Takagi, Shigeyuki

AU - Orimo, Shin ichi

N1 - Funding Information: The synchrotron radiation experiments were performed using a QST experimental station at the QST beamline BL14B1, SPring-8, with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal Nos. 2014A3614, 2015A3602, and 2015B3602). This work was supported by Grants-in-Aid for Scientific Research (KAKENHI) (Grant Nos. JP18H05513) from the Japan Society for the Promotion of Science as well as grants from the Inter-University Cooperative Research Program of the Institute for Materials Research, Tohoku University (Proposal Nos. 17K0026, 18K0032 , and 19K0049 ). Publisher Copyright: © 2020 Hydrogen Energy Publications LLC

PY - 2020/11/27

Y1 - 2020/11/27

N2 - To synthesize a novel titanium-containing hydride, a Co3Ti alloy with a Cu3Au-type structure was hydrogenated at 9 GPa and 900 °C. Structural changes under high pressure were monitored via in situ synchrotron radiation x-ray diffraction at BL14B1, SPring-8. The in-situ measurement reveals that novel hydride Co3TiH~4 is formed at 9 GPa and 900 °C. When the sample was depressurized at room temperature, the formed hydride decomposed to (the previously reported) Co3TiH~1 at a pressure of ~1 GPa. Co3TiH~1 was recovered at ambient conditions and decomposed gradually into the Co3Ti alloy. Co3TiH~4 is thermodynamically stable only at pressures above 1 GPa.

AB - To synthesize a novel titanium-containing hydride, a Co3Ti alloy with a Cu3Au-type structure was hydrogenated at 9 GPa and 900 °C. Structural changes under high pressure were monitored via in situ synchrotron radiation x-ray diffraction at BL14B1, SPring-8. The in-situ measurement reveals that novel hydride Co3TiH~4 is formed at 9 GPa and 900 °C. When the sample was depressurized at room temperature, the formed hydride decomposed to (the previously reported) Co3TiH~1 at a pressure of ~1 GPa. Co3TiH~1 was recovered at ambient conditions and decomposed gradually into the Co3Ti alloy. Co3TiH~4 is thermodynamically stable only at pressures above 1 GPa.

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