Hydrogen Storage Kinetics of Nanocrystalline and Amorphous LaMg12-Type Alloy-Ni Composites Synthesized by Mechanical Milling

• Published in: Journal of materials science & technology Vol. 32; no. 3; pp. 218 - 225
• Main Authors: Zhang, Yanghuan, Li, Baowei, Ren, Huiping, Yang, Tai, Guo, Shihai, Qi, Yan, Zhao, Dongliang
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2016
• Subjects: Activation energy; Hydrogen storage kinetics; LaMg12 alloy; Mechanical milling; 动力学性能; 复合材料; 机械球磨; 电化学储氢; 电化学性能; 纳米晶; 镍含量; 非晶; LaMg12 alloy; Mechanical milling; Hydrogen storage kinetics; Activation energy
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/j.jmst.2015.12.005

The nanocrystalline and amorphous LaMg11Ni ＋ x wt% Ni （x = 100, 200） composites were synthesized by the mechanical milling, and their gaseous and electrochemical hydrogen storage kinetics performance were systematically investigated, The results indicate that the as-milled composites exhibit excellent hydrogen storage kinetic performances, and increasing Ni content significantly facilitates the improvement of the hydrogen storage kinetics properties of the composites. The gaseous and electrochemical hydrogen storage kinetics of the composites reaches a maximum value with the variation of milling time. Increasing Ni content and milling time both make the hydrogen desorption activation energy lower, which are responsible for the enhancement in the hydrogen storage kinetics properties of the composites. The diffusion coefficient of hydrogen atom and activation enthalpy of charge transfer on the surface of the as-milled composites were also calculated, which are considered to be the dominated factors for the electrochemical high rate discharge ability.