Hydrogen storage properties of LaMg4Cu. (April 2018)

• Record Type: Journal Article
• Authors: Jiang, Xiaojing; Wu, Yong; Fu, Kai; Zheng, Jie; Li, Xingguo
• Is Part Of: Intermetallics. Volume 95(2018:Apr.)
• Page Start: 73
• Page End: 79
• Publication Date: 2018-04
• Subjects: A. Intermetallic -- B. Hydrogen storage -- C. Casting -- D. Segregation; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2018.01.015
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: A new LaMg4 Cu intermetallic compound with hexagonal UCoAl4 type structure is prepared by induction melting and subsequent heating treatment. The compound rapidly absorb 3.3 wt% hydrogen at 573 K under 4.0 MPa H2 for the first cycle, leading to phase segregation into LaH3, MgH2 and MgCu2 . The reversible dehydrogenation capacity is 2.6 wt% at 523 K, forming a mixture of LaH2, Mg and Mg2 Cu. The PCT curves show two plateaus corresponding to the formation of Mg and Mg2 Cu, respectively. Compared with mechanically manufactured Mg and bulk Mg2 Cu alloy, our in-situ generated LaH2, Mg and Mg2 Cu mixture exhibits excellent kinetics and cycling properties, which is mainly attributed to the La-Mg-Cu-H nanostructures via the hydrogen-induced decomposition of LaMg4 Cu intermetallic compounds. Highlights: Synthesis, structural and hydrogen storage behavior of LaMg4 Cu compounds. Nanocomposite was obtained by hydrogen-induced decomposition of LaMg4 Cu intermetallic. The intermetallic LaMg4 Cu exhibits excellent hydrogen desorption kinetic properties.