TY - JOUR
T1 - Anomalous hydrogen absorption on non-stoichiometric iron-carbon compound
AU - Miyaoka, Hiroki
AU - Ichikawa, Takayuki
AU - Fujii, Tatsuo
AU - Ishida, Wataru
AU - Isobe, Shigehito
AU - Fuji, Hironobu
AU - Kojima, Yoshitsugu
N1 - Funding Information:
This work was supported by the project “Advanced Fundamental Research Project on Hydrogen Storage Materials” of the New Energy and Industrial Technology Development Organization (NEDO) , Research Fellowships of the Japan Society for the Promotion of Science for young Scientists (JSPS) , and the Sasakawa Scientific Research Grant from The Japan Science Society. The authors gratefully acknowledge Dr. Tetsuo Honma for valuable help of X-ray absorption spectroscopy at SPring-8 BL19B2, and Dr. Tsumuraya, Dr. Biswajit Paik for the good discussion and valuable help in this work.
PY - 2010/10/8
Y1 - 2010/10/8
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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U2 - 10.1016/j.jallcom.2010.07.221
DO - 10.1016/j.jallcom.2010.07.221
M3 - Article
AN - SCOPUS:77957148425
VL - 507
SP - 547
EP - 550
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
SN - 0925-8388
IS - 2
ER -