2024-03-29T12:03:22Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/536132022-11-17T02:08:08Zhdl_2115_20074hdl_2115_161Microscopic characterization of metal-carbon-hydrogen composites (metal = Li, Mg)Isobe, ShigehitoYamada, SumitoWang, YongmingHashimoto, NaoyukiOhnuki, SomeiMiyaoka, HirokiIchikawa, TakayukiKojima, Yoshitsugu431Li-C-H system, which can store about 5.0 mass% of rechargeable H-2, has been reported as a promising hydrogen storage system by Ichikawa et al. [Appl. Phys. Lett. 86, 241914 (2005); Mater. Trans. 46, 1757 (2005)]. This system was investigated from the thermodynamic and structural viewpoints. However, hydrogen absorption/desorption mechanism and the state of hydrogen atoms absorbed in the composite have not been clarified yet. In order to find new or better hydrogen storage system, graphite powder and nano-structural graphite ball-milled under H-2 and Ar atmosphere were prepared and milled with Li and Mg under Ar atmosphere in this study. Microstructural analysis for those samples by transmission electron microscope revealed that LiC6 and/or LiC12 were formed in Li-C-H system. On the other hand, MgC2 was found in Mg-C-H system ball-milled under H-2 atmosphere, but not in the system ball-milled under Ar atmosphere. These results indicated that nano-structure in composites of nano-structural graphite is different from that of alkali (-earth) metal. For these reasons, metal-C-H system can be recognized to be a new family of hydrogen storage materials. (C) 2013 AIP Publishing LLC.American Institute of PhysicsJournal Articleapplication/pdfhttp://hdl.handle.net/2115/53613https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/53613/1/jap_114_093509.pdf0021-89791089-7550AA00693547Journal of applied physics1149093509-1093509-72013-09-07enginfo:doi/10.1063/1.4820455Copyright 2013 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of Applied Physics 114, 093509 (2013) and may be found at http://scitation.aip.org/content/aip/journal/jap/114/9/10.1063/1.4820455publisher