Effect of transition metals on ball-milled MmNi5 hydrogen storage alloy

被引：13

作者：

Srivastava S. ^{[1
]}

Panwar K. ^{[1
]}

机构：

[1] Department of Physics, Government Post Graduate College, Rishikesh

来源：

Materials for Renewable and Sustainable Energy | 2015年 / 4卷 / 04期

关键词：

3d-transition metal; ball-milling; Catalyst; MmNi[!sub]5[!/sub] alloy; SEM; XRD;

D O I：

10.1007/s40243-015-0062-9

中图分类号：

学科分类号：

摘要：

MmNi5 hydrogen storage alloy has been ball-milled with transition metal Co/Ni/Mn/Fe, one at a time in small amount of 0.5, 1.0, 2.0 and 5.0 wt%. Optimum hydrogenation behaviour has been observed for the sample containing 2.0 wt% of transition metal. Maximum hydrogen storage capacities of the MmNi5 alloy have been obtained as 1.68, 1.64, 1.56 and 1.52 wt%. Time taken for the maximum hydrogen absorption was recorded as 3.0, 4.0, 4.0 and 4.5 min and desorption took 1.9, 3.0, 3.5 and 4.0 min. Short-term cyclic performance has been improved as 98, 98, 97 and 96 % storage capacity retention after 20 cycles upon ball-milling with Co, Ni, Mn and Fe, respectively. The improvement in hydrogenation behaviour due to addition of transition metal has been obtained as Co > Ni > Mn > Fe. Structural and microstructural characterizations have been carried out by XRD and SEM techniques. Several factors have been discussed which affect catalytic action of transition metals in ball-milled MmNi5 alloy. © 2015 The Author(s).

引用

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