(北京有色金属研究总院 能源材料与技术研究中心， 北京 100088)
摘 要: 通过加入钛系、 锆系催化剂以及碳等添加剂可以显著改善配位氢化物的吸放氢动力学性能， 加入催化剂可以使配位氢化物的可逆贮氢量达3.1%~4.2%(质量分数)。 采用机械合金化法在NaAlH4中加入钛的化合物作为催化剂， 在很大程度上改进了其热力学和动力学性能， 可逆吸氢量可达4.0%以上， 可逆放氢量也能达3.0%以上。 并对试样进行了X射线衍射、 扫描电镜以及X射线光电子能谱分析， 证明了可逆反应的发生， 探讨反应的机理。
关键字: 氢化铝钠； 贮氢材料； 机械合金化
（Research Center of Energy Material and Technology,
General Research Institute for Non-ferrous Metals, Beijing 100088, China）
Abstract: The discovery that hydrogen can be reversibly absorbed and desorbed from complex hydrides (alanates) by the addition of catalysts has created an entirely new prospect for lightweight hydrogen storage. Unlike the intermetallic hydrides, these compounds release hydrogen through a series of decomposition/recombination reactions. The reversible capacity of these materials can reach 3.1%-4.2%(mass fraction) by addition of catalysts. The kinetics of dehydrogenation and rehydrogenation of the alanates was greatly improved by doping catalysts including Ti, Zr, Fe and additives such as C. The study on sodium aluminium hydride doping with Ti-compound by mechanical milling was shown. The thermodynamics and kinetics are enhanced greatly and its reversible capacity of hydrogen reaches 3.0%. The phase structure and valence change were characterized by X-ray diffractrometry (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS).
Key words: sodium aluminium hydride; hydrogen storage material; mechanical milling
