Hydrogen desorption mechanism in MgH2-Nb nanocomposites - art. no. 052103

Authors
Pelletier, JF Huot, J Sutton, M Schulz, R Sandy, AR Lurio, LB Mochrie, SGJ
Citation
Jf. Pelletier et al., Hydrogen desorption mechanism in MgH2-Nb nanocomposites - art. no. 052103, PHYS REV B, 6305(5), 2001, pp. 2103-NIL_9
Citations number
22
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICAL REVIEW B
ISSN journal
01631829 → ACNP
Volume
6305
Issue
5
Year of publication
2001
Pages
2103 - NIL_9
Database
ISI
SICI code
0163-1829(20010201)6305:5<2103:HDMIMN>2.0.ZU;2-W
Abstract
In situ time-resolved x-ray scattering measurements of hydrogen desorption in MgH2-Nb nanocomposites using synchrotron radiation are presented. Result s show that niobium acts like a catalyst for hydrogen absorption and desorp tion. It is found that hydrogen desorption involves the formation of a shor t-lived metastable niobium-hydride phase which acts as a gateway through wh ich hydrogen released from MgH2 is Bowing. The desorption kinetics of this system is revealed through temporal profiles showing the lifetimes of the d ifferent phases involved.