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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.46  No.8 (2005)  >  pp.1757-1759

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Hydrogen Desorption Properties of Lithium–Carbon–Hydrogen System

Takayuki Ichikawa1), Shigehito Isobe1) and Hironobu Fujii1)
1) Materials Science Center, N-BARD, Hiroshima University

Hydrogen desorption properties of a mixture of hydrogenated nanostructural graphite CnanoHx and lithium hydride LiH are demonstrated in this paper, where CnanoHx was synthesized from graphite by ballmilling under 1 MPa hydrogen for 80 h. First of all, we clarified the hydrogenated properties of CnanoHx synthesized under four different milling conditions. The hydrogen desorption profile with typical two-peak structure was caused by iron contamination in CnanoHx from steel balls during ballmilling, while the products prepared by zirconia balls showed the broad single peak in hydrogen desorption. The amount of desorbed hydrocarbon gas from the products using a rocking (vibrating) mill estimated by the thermogravimetry was larger than that using a rotating (planetary) one. Next, the destabilization properties of extremely stable LiH was examined, indicating that LiH was destabilized by mixing with another component LiOH or NaOH, and then, the mixture easily released hydrogen gas at lower temperature compared with LiH, LiOH and NaOH themselves. On the analogy of this result, we examined hydrogen desorption properties of the ballmilled mixture of LiH and CnanoHx. The hydrogen desorption started from about 200°C and showed a peak at 350°C, although each product needs more than 400°C to release hydrogen. Since this hydrogen storage system is specially based on lithium, carbon and hydrogen in the mixture, it can be regarded as Li–C–H hydrogen storage system.

hydrogen storage materials, nanostructured graphite, lithium hydride, thermal desorption properties, destabilization

Received: April 22, 2005
Accepted: June 08, 2005 , Published online: November 14, 2005
Copyright (c) 2005 The Japan Institute of Metals



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