Anomalous hydrogen absorption on non-stoichiometric iron-carbon compound
JAlloyCompd_507_547.pdf 270 KB
Hydrogen absorbing materials
X-ray and gamma-ray spectroscopies
On the synthesis of nano-structural hydrogenated graphite by ball-milling under H-2 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 H-2 desorption at 450 degrees 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.
Journal of Alloys and Compounds
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Elsevier Science SA
Copyright (c) 2010 Elsevier B.V.
Institute for Advanced Materials Research