Hydrogen storage kinetics of Mg20Ni1o-xMx (M=Cu, Co; x=0-4) alloys prepared by melt spinning
In order to improve the gaseous hydrogen storage kinetics of the Mg2Ni-type alloys, Ni in the alloy was partially substituted by M (M=Cu, Co). Melt-spinning technology was used for the preparation of the Mg20Ni10-xMx(M=Cu, Co; x=0, 1, 2, 3, 4) hydrogen storage alloys. The structures of the as-cast and spun alloys are characterized by XRD, SEM and TEM. The gaseous hydrogen absorption and desorption kinetics of the alloys were measured by an automatically controlled Sieverts apparatus. The results show that the as-spun (M=Cu) alloys hold a typical nanocrystalline structure, whereas the asspun (M=Co) alloys display a nanocrystalline and amorphous structure, confirming that the substitution of Co for Ni facilitates the glass formation in the Mg2Ni-type alloy. The substitution of M (M=Cu, Co) for Ni engenders an insignificant effect on the hydrogen absorption kinetics of the alloys, but it markedly ameliorates the hydrogen desorption kinetics of the alloys. As the M (M=Cu, Co) content increase from 0 to 4, the hydrogen desorption ratio (Rd20) is enhanced from 27.7％ to 58.9％ for the as-spun (30 m/s) alloy (M=Cu), and from 27.7％ to 70.2％ for the as-spun (30 m/s) alloy (M=Co).
Mg2Ni-type alloy Melt spinning Element substitution Hydrogen storage kinetics
Yang-huan Zhang Xiao-gang Liu Le-le Chen Hui-ping Ren Guo-fang Zhang Dong-liang Zhao
Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 10008 Elected State Key Laboratory, Inner Mongolia University of Science and Technology, Baotou 014010, Ch Department of Functional Material Research, Central Iron and Steel Research Institute, Beijing 10008
国际会议
大连
英文
291-296
2011-10-19（万方平台首次上网日期，不代表论文的发表时间）