Effect of h-BN additive on hydrogen sorption by Ti under mechanical treatment in H-2/He flow

ISSN
1932-7447
Date Issued
2008
Author(s)
Morozova, Olga S.
Khomenko, T. I.
Leonov, Alexander V.
Postnikov, A. V.
Kurmaev, Ernst Z.
Moewes, A.
DOI
10.1021/jp077582s
Abstract
The effect of h-BN additive on hydrogen sorption by Ti under mechanical treatment in H-2/He flow and on the thermal stability of Ti-hydride produced during milling were studied using kinetic, structural, microscopic, and spectroscopic techniques and theoretical first-principles calculations. The results obtained were compared with the corresponding properties of pure Ti and Ti with graphite additive. Like graphite, hexagonal BN was found to be an effective additive to improve the hydrogen sorption capacity of Ti. New types of occupation sites available for hydrogen, very similar to those detected for Ti/C, were observed. These sites are characterized by a low H-2 desorption temperature: 630-670 K instead of similar to 1000 K.