Hydrogen storage of a novel combined system of LiNH2–NaMgH3: synergistic effects of in situ formed alkali and alkaline-earth metal hydrides

Yongtao Li; Fang Fang; Yun Song; Yuesheng Li; Dalin Sun; Shiyou Zheng; Leonid A. Bendersky; Qingan Zhang; Liuzhang Ouyang; Min Zhu

doi:10.1039/C2DT31923C

Hydrogen storage of a novel combined system of LiNH₂–NaMgH₃: synergistic effects of in situ formed alkali and alkaline-earth metal hydrides†

Yongtao Li,^a Fang Fang,^a Yun Song,^a Yuesheng Li,^a Dalin Sun,*^a Shiyou Zheng,^b Leonid A. Bendersky,^b Qingan Zhang,^c Liuzhang Ouyang^d and Min Zhu*^d

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* Corresponding authors

^a Department of Materials Science, Fudan University, Shanghai 200433, China
E-mail: dlsun@fudan.edu.cn
Fax: +86-21-6564 2873
Tel: +86-21-6564 2873

^b Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA

^c School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China

^d School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China
E-mail: memzhu@scut.edu.au
Tel: +86-20-8711 2830

Abstract

Bimetallic hydride NaMgH₃ is used for the first time as a vehicle to enhance hydrogen release and uptake from LiNH₂. The combination of NaMgH₃ with LiNH₂ at a molar ratio of 1 : 2 can release about 4.0 wt% of hydrogen without detectable NH₃ emission in the temperature range of 45 °C to 325 °C and exhibiting superior dehydrogenation as compared to individual NaH and/or MgH₂ combined with LiNH₂. A high capacity retention of about 75% resulting from the introduction of NaMgH₃ is also achieved in LiNH₂ as well as re-hydrogenation under milder conditions of 180 °C and 5 MPa H₂ pressure. These significant improvements are attributed to synergistic effects of in situ formed NaH and MgH₂via the decomposition of NaMgH₃ 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 [NH₂]⁻ amide and the resulting [NH]²⁻ imide complexes.

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Hydrogen storage of a novel combined system of LiNH₂–NaMgH₃: synergistic effects of in situ formed alkali and alkaline-earth metal hydrides†

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Hydrogen storage of a novel combined system of LiNH₂–NaMgH₃: synergistic effects of in situ formed alkali and alkaline-earth metal hydrides

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