钒
解吸
氢气储存
吸附
氢
材料科学
过渡金属
热脱附
分析化学(期刊)
热脱附光谱法
相(物质)
结晶学
无机化学
物理化学
化学
冶金
吸附
催化作用
有机化学
作者
M.V. Lototsky,V.A. Yartys,I.Yu. Zavaliy
标识
DOI:10.1016/j.jallcom.2005.01.139
摘要
This work was focused on the studies of vanadium-based “low-temperature” bcc alloys as H storage materials. Both as cast and annealed at 1100 ° C quaternary alloys V92.5−x−yZr7.5Ti7.5+x−yMy (M = Cr, Mn, Fe, Co, Ni; x=0, 10; y=0, 7.5) were studied. They were characterised by XRD, PCT hydrogen absorption–desorption measurements (T=30 –120 ° C) and thermal desorption spectroscopy studies of H desorption from the saturated hydrides (T=−100to800° C). The thermodynamics of the VH∼2↔ VH∼1 transition and hydrogen sorption capacities (1.55,…,1.80 H/M) were found to be significantly influenced by the substituting M-element. The reversible hydrogen storage capacity (T<100° C, P>0.1 bar) reaches 50–60% of its overall value. Complete hydrogen desorption proceeds in vacuum at T<300° C. The major future challenge of the work is in increasing of the easy-reversible part of the H storage capacity corresponding to transformation VH∼2↔ VH∼1 by reducing the content of H in the monohydride.
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