Enhanced hydrogen storage properties of LiBH4–MgH2 composite by the catalytic effect of MoCl3

✍ Scribed by Guang-lin Xia; Hai-yan Leng; Nai-xin Xu; Zhi-lin Li; Zhu Wu; Jun-lin Du; Xue-bin Yu

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 888 KB
• Volume: 36
• Category: Article
• ISSN: 0360-3199
• DOI: 10.1016/j.ijhydene.2011.03.060

✦ Synopsis

Though LiBH 4 eMgH 2 system exhibits an excellent hydrogen storage property, it still presents high decomposition temperature over 350 C and sluggish hydrogen absorption/desorption kinetics. In order to improve the hydrogen storage properties, the influence of MoCl 3 as an additive on the hydrogenation and dehydrogenation properties of LiBH 4 eMgH 2 system is investigated. The reversible hydrogen storage performance is significantly improved, which leads to a capacity of about 7 wt.% hydrogen at 300 C. XRD analysis reveals that the metallic Mo is formed by the reaction between LiBH 4 and MoCl 3 , which is highly dispersed in the sample and results in improved dehydrogenation and hydrogenation performance of LiBH 4 eMgH 2 system. From Kissinger plot, the activation energy for hydrogen desorption of LiBH 4 eMgH 2 system with additive MoCl 3 is estimated to be w43 kJ mol À1 H 2 , 10 kJ mol À1 lower than that for the pure LiBH 4 eMgH 2 system indicating that the kinetics of LiBH 4 eMgH 2 composite is significantly improved by the introduction of Mo.