Effect of h-BN Additive on Hydrogen Sorption by Ti under Mechanical Treatment in H2/He Flow

• Published in: Journal of physical chemistry. C Vol. 112; no. 15; pp. 5869 - 5879
• Main Authors: Borchers, C, Morozova, O. S, Khomenko, T. I, Leonov, A. V, Postnikov, A. V, Kurmaev, E. Z, Moewes, A, Pundt, A
• Format: Journal Article
• Language: English
• Published: American Chemical Society 17.04.2008
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/jp077582s

The effect of h-BN additive on hydrogen sorption by Ti under mechanical treatment in H2/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 H2 desorption temperature:  630−670 K instead of ∼1000 K.