Investigations on synthesis, characterization and hydrogenation behavior of hydrogen storage alloys, Mm1-xCaxNi5-y-zAlyFez(x=0,0.05,0.1,0.2,0.3;y=0,0.1;z=0,0.1)
Investigations on synthesis, characterization and hydrogenation behavior of hydrogen storage alloys, Mm1-xCaxNi5-y-zAlyFez(x=0,0.05,0.1,0.2,0.3;y=0,0.1;z=0,0.1)
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DOI：
10.1016/j.ijhydene.2007.06.011
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发表时间：
2007-12
影响因子：
7.2
通讯作者：
S. Srivastava;R. K. Upadhyay
中科院分区：
文献类型：
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作者：
S. Srivastava;R. K. Upadhyay
本研究涉及以成分 Mm1-xCaxNi5-y-zAlyFez(x=0,0.05,0.1,0.2,0.3;y=0,0.1;z=0,0.1) 为代表的 Ca 取代版本 MmNi5 型储氢材料的合成和表征。对材料中存在的 Ca 浓度进行了比较研究，重点是它们的储氢能力，然后研究了 Al 和 Fe 的作用。结构表征表明合成合金中形成了 CaCu5 型结构和少量游离 Ni。在脱氢版本中检测到一些额外的 XRD 峰，对应于 CaH2，这些峰在含铁样品中消失。通过 PC 等温线和动力学曲线监测这些材料的氢化行为。使用复合颗粒路线重新合成了最大存储容量为1.6wt％的组合物Mm0.9Ca0.1Ni4.8Al0.1Fe0.1，该组合物显着提高了储氢容量，即1.9wt％。
The present study deals with investigations on the synthesis and characterization of Ca substituted versions of MmNi5-type hydrogen storage materials typified by the compositions Mm1-xCaxNi5-y-zAlyFez(x=0,0.05,0.1,0.2,0.3;y=0,0.1;z=0,0.1). A comparative study of Ca concentration present in the materials, with emphasis on their hydrogen storage capacity, was carried out and then the role of Al and Fe was studied. The structural characterization revealed formation of CaCu5-type structure and small amount of free Ni in the as-synthesized alloys. Some extra XRD-peaks, corresponding to CaH2were detected in dehydrogenated versions which disappeared in Fe containing samples. The hydrogenation behavior of these materials was monitored through pc-isotherms and kinetic curves. A composition, Mm0.9Ca0.1Ni4.8Al0.1Fe0.1having maximum storage capacity of 1.6wt% was resynthesized using composite pellet route which improved hydrogen storage capacity drastically, i.e. 1.9wt%.