Hydrogen Storage Kinetics of Nanocrystalline and Amorphous LaMg12-Type Alloy–Ni Composites Synthesized by Mechanical Milling
来源期刊:JOURNAL OF MATERIALS SCIENCE TECHNOLOG2016年第3期
论文作者:Yanghuan Zhang Baowei Li Huiping Ren Tai Yang Shihai Guo Yan Qi Dongliang Zhao
文章页码:218 - 225
摘 要: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.
Yanghuan Zhang1,2,Baowei Li1,Huiping Ren1,Tai Yang2,Shihai Guo2,Yan Qi2,Dongliang Zhao2
1. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources, Inner Mongolia University of Science and Technology2. Department of Functional Material Research, Central Iron and Steel Research Institute
摘 要: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.
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