In situ hybridization of LiNH2–LiH–Mg(BH4)2 nano-composites: intermediate and optimized hydrogenation properties
Literature Information
Dichen Li, He Fu, Gongbiao Xin, Jie Zheng, Xingguo Li
Nano-composites of LiNH2–LiH–xMg(BH4)2 (0 ≤ x ≤ 2) were prepared by plasma metal reaction followed by a nucleation growth method. Highly reactive LiNH2–LiH hollow nanoparticles offered a favorable nucleus during a precipitation process of liquid Mg(BH4)2·OEt2. The electron microscopy results suggested that more than 90% of the obtained nano-composites were in the range 200–400 nm. Because of the short diffusion distance and ternary mixture self-catalyzing effect, this material possesses enhanced hydrogen (de)sorption attributes, including facile low-temperature kinetics, impure gases attenuation and partial reversibility. The optimal hydrogen storage properties were found at the composition of LiNH2–LiH–0.5Mg(BH4)2, which was tentatively attributed to a Li4(NH2)2(BH4)2 intermediate. 5.3 wt% hydrogen desorption could be recorded at 150 °C, with the first 2.2 wt% release being reversible. This work suggests that controlled in situ hybridization combined with formula optimization can improve hydrogen storage properties.
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