中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 32 No. 6 June 2022 |
（1. Fujian Provincial Key Laboratory of Functional Materials and Applications, School of Materials Science and Engineering, Xiamen University of Technology, Xiamen 361024, China;
2. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310014, China;
3. Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering, School of Marine Engineering, Jimei University, Xiamen 361021, China）
Abstract:LaF3 was doped to the Mg(Al) solid solution alloy for enhancing the hydrogen absorption and desorption by ball milling. XRD was used to analyze the phases of the samples and the phase transition induced by hydrogenation and dehydrogenation. The microstructure and phase distribution were investigated by SEM and STEM. The hydrogen storage properties were measured by Sieverts method. For Mg0.93Al0.07-5wt.%LaF3 nanocomposite, the hydrogen storage kinetic properties were significantly improved by reducing the hydriding and dehydriding activation energies to 65 and 78 kJ/mol, respectively, and the dehydriding enthalpy was calculated to be 69.7 kJ/mol. The improved hydrogen storage properties were mainly attributed to the catalytic effects of the in situ formed nanostructure Al11La3 and MgF2 together with the dissolving of Al in Mg lattice.
Key words: lanthanum fluorite; magnesium hydride; magnesium; aluminum; hydrogen storage properties; hydrogenation
