(北京有色金屬研究總院 能源材料與技術研究中心， 北京 100088)
摘 要: 通過加入鈦系、 鋯系催化劑以及碳等添加劑可以顯著改善配位氫化物的吸放氫動力學性能， 加入催化劑可以使配位氫化物的可逆貯氫量達3.1%~4.2%(質量分數(shù))。 采用機械合金化法在NaAlH4中加入鈦的化合物作為催化劑， 在很大程度上改進了其熱力學和動力學性能， 可逆吸氫量可達4.0%以上， 可逆放氫量也能達3.0%以上。 并對試樣進行了X射線衍射、 掃描電鏡以及X射線光電子能譜分析， 證明了可逆反應的發(fā)生， 探討反應的機理。
關鍵字: 氫化鋁鈉； 貯氫材料； 機械合金化
JIANG Li-jun, LIU Xiao-peng
（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
