NaAlH_4空间约束体系的构建及其脱/加氢行为  

Hydrogen Release and Uptake Behaviors of Space-Confined NaAlH_4 in Porous Materials

作　　者：李永涛[1] 周广有[1] 郑时有[1] 方方[1] 孙大林[1] 欧阳柳章[2] 朱敏[2] 

机构地区：[1]复旦大学材料科学系,上海200433 [2]华南理工大学材料科学与工程学院,广东广州510640

出　　处：《中国材料进展》2009年第5期11-16,共6页Materials China

基　　金：国家自然科学基金资助项目(10776004;20833009)

摘　　要：配位氢化物具有较高的质量储氢密度,已成为国内外储氢材料的研究热点,但尚未解决的脱/加氢温度过高、速率慢和可逆性差等问题是制约其实际应用的主要原因。利用孔性材料的结构特点来构建纳米尺度的空间约束体系,可有效地改善配位氢化物的脱/加氢性能。以NaAlH4为例,介绍了孔性材料的制备和表面修饰,分析了配位氢化物/孔性介质空间约束体系的构建及其脱/加氢行为。这种空间约束体系为改善配位氢化物的储氢性能提供了一条新途径。进一步构建配位氢化物/孔性介质/催化剂的空间约束体系,实现对配位氢化物的复合催化,将是今后努力的方向。Complex hydrides have attracted intense interest owing to their higher mass hydrogen density compared with that of conventional metal hydrides; however, their practical applications are blocked by high thermal stability, slow reaction kinetics and poor reversibility. An improved hydrogen storage property has been obtained by using space-confining complex hydride in porous materials. The preparation and surface modification of porous materials are briefly introduced, followed by the incorporation of NaAlH4 into porous materials and the resulting effects on its dehydrogenation/rehydrogenation behaviors. The space confinement method provides a new approach to enhance the hydrogen storage properties of complex hydrides.

关 键 词：配位氢化物 孔性介质 纳米尺度 脱/加氢性能 

分 类 号：TK91[动力工程及工程热物理] TQ116.2[化学工程—无机化工]