Enhanced hydrogen storage performance of Mg-Cu-Ni system catalyzed by CeO2 additive

作者：Yi Yin,Bo Li,Zeming Yuan,Yan Qi,Yanghuan Zhang

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.

发文机构：Department of Functional Material Research Key Laboratory of Integrated Exploitation of Baiyun Obo Multi-Metal Resources

关键词：Mg-Cu-NialloyCeO2additiveBallmillingDehydrogenationactivationenergyThermodynamicproperty

分类号： TG139.7[一般工业技术—材料科学与工程]