Ti/C and Ti/ h-BN nanocomposites: Comparison of hydrogen sorption/desorption properties

Differences in hydrogen uptake properties of Ti upon mechanical treatment with graphite or h-BN as additive are entropic in nature. The effect of graphite and BN on hydrogen absorption by Ti under milling in H 2/He flow and on the thermal stability of Ti-hydride produced during milling is compared....

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Bibliographic Details
Published in:Chemical physics letters 2008-11, Vol.465 (1), p.82-85
Main Authors: Borchers, C., Morozova, O.S., Khomenko, T.I., Leonov, A.V., Kurmaev, E.Z., Moewes, A., Pundt, A.
Format: Article
Language:English
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Summary:Differences in hydrogen uptake properties of Ti upon mechanical treatment with graphite or h-BN as additive are entropic in nature. The effect of graphite and BN on hydrogen absorption by Ti under milling in H 2/He flow and on the thermal stability of Ti-hydride produced during milling is compared. BN is the more effective additive than graphite to improve hydrogen sorption capacity of Ti because of the stimulation of a higher hydrogen uptake. Both additives stimulate the formation of occupation sites characterized by a H 2 desorption temperature that is up to 400 K lower than that of pure Ti. The reasons for the higher performance of hexagonal BN as compared to graphite are found to be entropic in nature.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2008.09.054