title: Hydrogen storage of a novel combined system of LiNH2-NaMgH3: synergistic effects of in situ formed alkali and alkaline-earth metal hydrides.
abstract: Bimetallic hydride NaMgH(3) is used for the first time as a vehicle to enhance hydrogen release and uptake from LiNH(2). The combination of NaMgH(3) with LiNH(2) at a molar ratio of 1 : 2 can release about 4.0 wt% of hydrogen without detectable NH(3) emission in the temperature range of 45 °C to 325 °C and exhibiting superior dehydrogenation as compared to individual NaH and/or MgH(2) combined with LiNH(2). A high capacity retention of about 75% resulting from the introduction of NaMgH(3) is also achieved in LiNH(2) as well as re-hydrogenation under milder conditions of 180 °C and 5 MPa H(2) pressure. These significant improvements are attributed to synergistic effects of in situ formed NaH and MgH(2)via the decomposition of NaMgH(3) where a succession of competing reactions from the cyclic consumption/recovery of NaH are involved and serve as a "carrier" for the ultra-rapid conveyance of the N-containing species between the [NH(2)](-) amide and the resulting [NH](2-) imide complexes.
authors.affiliation: Department of Materials Science, Fudan University, Shanghai 200433, China.
authors.forename: Yongtao
authors.initials: Y
authors.lastname: Li
authors.forename: Fang
authors.initials: F
authors.lastname: Fang
authors.forename: Yun
authors.initials: Y
authors.lastname: Song
authors.forename: Yuesheng
authors.initials: Y
authors.lastname: Li
authors.forename: Dalin
authors.initials: D
authors.lastname: Sun
authors.forename: Shiyou
authors.initials: S
authors.lastname: Zheng
authors.forename: Leonid A
authors.initials: LA
authors.lastname: Bendersky
authors.forename: Qingan
authors.initials: Q
authors.lastname: Zhang
authors.forename: Liuzhang
authors.initials: L
authors.lastname: Ouyang
authors.forename: Min
authors.initials: M
authors.lastname: Zhu