Enhanced hydrogen storage performance of Mg-Cu-Ni system catalyzed by CeO2 additive
来源期刊:JOURNAL OF RARE EARTHS2020年第9期
论文作者:Yi Yin Bo Li Zeming Yuan Yan Qi Yanghuan Zhang
文章页码:983 - 993
摘 要:In this paper,the as-cast Mg85Cu5Ni10 alloy and Mg85Cu5Ni10-x wt% CeO2(x=0,4,8) alloys were prepared successfully by vacuum induction smelting and ball milling.The microstructure,hydrogen absorption/desorption kinetics and thermodynamics performances of the alloys were studied in detail.The results show that the Mg85Cu5Ni10 alloys with CeO2 additive have faster hydrogenation/dehydrogenation kinetics and better thermodynamic properties.The dehydrogenation activation energy is reduced to 81.211 kJ/mol from 119.142 by adding 8 wt% CeO2.CeO2 contributes to producing structural defects,nanocrystallines,grain boundaries,partial amorphous,lattice dislocations and cracks which are favorable to provide more hydrogen diffusion channels during hydriding/dehydriding process.Meanwhile,CeO2 additive weakens the bond energy of Mg-H.These micro structural changes caused by CeO2 additive improve the hydrogen storage performance of Mg85Cu5Ni10 markedly.
Yi Yin1,Bo Li1,Zeming Yuan1,2,Yan Qi1,Yanghuan Zhang1,2
1. Department of Functional Material Research,Central Iron and Steel Research Institute2. Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources,Inner Mongolia University of Science and Technology
摘 要:In this paper,the as-cast Mg85Cu5Ni10 alloy and Mg85Cu5Ni10-x wt% CeO2(x=0,4,8) alloys were prepared successfully by vacuum induction smelting and ball milling.The microstructure,hydrogen absorption/desorption kinetics and thermodynamics performances of the alloys were studied in detail.The results show that the Mg85Cu5Ni10 alloys with CeO2 additive have faster hydrogenation/dehydrogenation kinetics and better thermodynamic properties.The dehydrogenation activation energy is reduced to 81.211 kJ/mol from 119.142 by adding 8 wt% CeO2.CeO2 contributes to producing structural defects,nanocrystallines,grain boundaries,partial amorphous,lattice dislocations and cracks which are favorable to provide more hydrogen diffusion channels during hydriding/dehydriding process.Meanwhile,CeO2 additive weakens the bond energy of Mg-H.These micro structural changes caused by CeO2 additive improve the hydrogen storage performance of Mg85Cu5Ni10 markedly.
关键词: