Ti-doped alkali metal aluminium hydrides as potential novel reversible hydrogen storage materials
Ti-doped alkali metal aluminium hydrides as potential novel reversible hydrogen storage materials
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DOI：
10.1016/s0925-8388(96)03049-6
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发表时间：
1997-05-20
影响因子：
6.2
通讯作者：
Schwickardi, M
中科院分区：
文献类型：
--
作者：
Bogdanovic, B;Schwickardi, M
提出了基于催化反应的新的可逆储氢系统（Eqs.（第4至6段）。在两个方向上的反应的催化加速是通过用几摩尔%的选定的Ti化合物掺杂碱金属铝来实现的。Ti催化体系的PCI图显示不存在滞后和几乎水平的压力平台。的NaAlH 4系统的PCI揭示了两个温度依赖性的压力平台，对应于两步可逆解离的NaAlH 4。的Na 3AlH 6系统的PCI显示只有一个压力平台，后者可以降低部分取代钠锂。在循环试验中，可逆H-2容量为4.2-3.1和2.7-2.1重量% H。
New reversible hydrogen storage systems are proposed, based on catalyzed reactions (Eqs. 4-6). The catalytic acceleration of the reactions in both directions is achieved by doping alkali metal aluminium hydrides with a few mol% of selected Ti compounds. The PCI diagrams of the Ti catalyzed systems show an absence of hysteresis and nearly horizontal pressure plateaus. The PCI of the NaAlH4 system reveals two temperature-dependent pressure plateaus, corresponding to the two-step reversible dissociation of NaAlH4. The PCI of the Na3AlH6 system shows only one pressure plateau; the latter can be lowered by partial substitution of Na by Li. Ln cyclic tests, reversible H-2 capacities of 4.2-3.1 and 2.7-2.1 wt% H have been achieved.