Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
Phys Chem Chem Phys. 2012 Feb 28;14(8):2857-63. doi: 10.1039/c2cp23776h. Epub 2012 Jan 23.
Nano-composites of LiNH(2)-LiH-xMg(BH(4))(2) (0 ≤ x ≤ 2) were prepared by plasma metal reaction followed by a nucleation growth method. Highly reactive LiNH(2)-LiH hollow nanoparticles offered a favorable nucleus during a precipitation process of liquid Mg(BH(4))(2)·OEt(2). 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 LiNH(2)-LiH-0.5Mg(BH(4))(2), which was tentatively attributed to a Li(4)(NH(2))(2)(BH(4))(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.
LiNH(2)-LiH-xMg(BH(4))(2) (0 ≤ x ≤ 2)纳米复合材料通过等离子体金属反应和形核生长法制备而成。高反应性的 LiNH(2)-LiH 中空纳米粒子在液体 Mg(BH(4))(2)·OEt(2)的沉淀过程中提供了有利的核。电子显微镜结果表明，超过 90%的所得纳米复合材料的范围在 200-400nm 之间。由于短的扩散距离和三元混合物自催化效应，这种材料具有增强的氢（解）吸属性，包括低温动力学的易进行、杂质气体的衰减和部分可逆性。在 LiNH(2)-LiH-0.5Mg(BH(4))(2)的组成下发现了最佳的储氢性能，这归因于 Li(4)(NH(2))(2)(BH(4))(2)中间相。在 150°C 时可记录到 5.3wt%的氢解吸，其中前 2.2wt%的释放是可逆的。这项工作表明，通过控制原位杂化和配方优化可以提高储氢性能。
