Anomalous hydrogen absorption on non-stoichiometric iron-carbon compound

Hiroki Miyaoka; Takayuki Ichikawa; Tatsuo Fujii; Wataru Ishida; Shigehito Isobe; Hironobu Fuji; Yoshitsugu Kojima

doi:10.1016/j.jallcom.2010.07.221

Anomalous hydrogen absorption on non-stoichiometric iron-carbon compound

Hiroki Miyaoka, Takayuki Ichikawa, Tatsuo Fujii, Wataru Ishida, Shigehito Isobe, Hironobu Fuji, Yoshitsugu Kojima

Research output: Contribution to journal › Article

10 Citations (Scopus)

Abstract

On the synthesis of nano-structural hydrogenated graphite by ball-milling under H₂ atmosphere, iron contamination was mingled from steel balls during ball-milling. It is clarified by spectroscopic measurements that the mingled iron formed a non-stoichiometric iron-carbon (Fe-C) compound. The Fe-C phase was transformed to a well-ordered phase with H₂ desorption at 450 °C, suggesting that the hydrogen atoms were anomalously trapped at the Fe-C phase. With respect to hydrogen absorbing properties, the mingled iron enhanced the hydrogen capacity by about 50% compared with iron free hydrogenated graphite, where H/Fe was about 13 mass%. Therefore, if the hydrogen absorption site originated in the Fe-C phase could be synthesized independently, it should be recognized as a promising hydrogen storage system.

Original language	English
Pages (from-to)	547-550
Number of pages	4
Journal	Journal of Alloys and Compounds
Volume	507
Issue number	2
DOIs	https://doi.org/10.1016/j.jallcom.2010.07.221
Publication status	Published - Oct 8 2010

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Keywords

Amorphous materials
Hydrogen absorbing materials
Mechanochemical processing
Mössbauer spectroscopy
Thermal analysis
X-ray and gamma-ray spectroscopies

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Cite this

Miyaoka, H., Ichikawa, T., Fujii, T., Ishida, W., Isobe, S., Fuji, H., & Kojima, Y. (2010). Anomalous hydrogen absorption on non-stoichiometric iron-carbon compound. Journal of Alloys and Compounds, 507(2), 547-550. https://doi.org/10.1016/j.jallcom.2010.07.221

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abstract = "On the synthesis of nano-structural hydrogenated graphite by ball-milling under H2 atmosphere, iron contamination was mingled from steel balls during ball-milling. It is clarified by spectroscopic measurements that the mingled iron formed a non-stoichiometric iron-carbon (Fe-C) compound. The Fe-C phase was transformed to a well-ordered phase with H2 desorption at 450 °C, suggesting that the hydrogen atoms were anomalously trapped at the Fe-C phase. With respect to hydrogen absorbing properties, the mingled iron enhanced the hydrogen capacity by about 50% compared with iron free hydrogenated graphite, where H/Fe was about 13 mass%. Therefore, if the hydrogen absorption site originated in the Fe-C phase could be synthesized independently, it should be recognized as a promising hydrogen storage system.",

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author = "Hiroki Miyaoka and Takayuki Ichikawa and Tatsuo Fujii and Wataru Ishida and Shigehito Isobe and Hironobu Fuji and Yoshitsugu Kojima",

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AU - Miyaoka, Hiroki

AU - Ichikawa, Takayuki

AU - Fujii, Tatsuo

AU - Ishida, Wataru

AU - Isobe, Shigehito

AU - Fuji, Hironobu

AU - Kojima, Yoshitsugu

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N2 - On the synthesis of nano-structural hydrogenated graphite by ball-milling under H2 atmosphere, iron contamination was mingled from steel balls during ball-milling. It is clarified by spectroscopic measurements that the mingled iron formed a non-stoichiometric iron-carbon (Fe-C) compound. The Fe-C phase was transformed to a well-ordered phase with H2 desorption at 450 °C, suggesting that the hydrogen atoms were anomalously trapped at the Fe-C phase. With respect to hydrogen absorbing properties, the mingled iron enhanced the hydrogen capacity by about 50% compared with iron free hydrogenated graphite, where H/Fe was about 13 mass%. Therefore, if the hydrogen absorption site originated in the Fe-C phase could be synthesized independently, it should be recognized as a promising hydrogen storage system.

AB - On the synthesis of nano-structural hydrogenated graphite by ball-milling under H2 atmosphere, iron contamination was mingled from steel balls during ball-milling. It is clarified by spectroscopic measurements that the mingled iron formed a non-stoichiometric iron-carbon (Fe-C) compound. The Fe-C phase was transformed to a well-ordered phase with H2 desorption at 450 °C, suggesting that the hydrogen atoms were anomalously trapped at the Fe-C phase. With respect to hydrogen absorbing properties, the mingled iron enhanced the hydrogen capacity by about 50% compared with iron free hydrogenated graphite, where H/Fe was about 13 mass%. Therefore, if the hydrogen absorption site originated in the Fe-C phase could be synthesized independently, it should be recognized as a promising hydrogen storage system.

KW - Amorphous materials

KW - Hydrogen absorbing materials

KW - Mechanochemical processing

KW - Mössbauer spectroscopy

KW - Thermal analysis

KW - X-ray and gamma-ray spectroscopies

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10.1016/j.jallcom.2010.07.221