中文摘要：

氢是最有发展潜力的清洁能源之一，开发温和条件下具有高吸放氢容量的储氢材料是目前研究的一个重要方向．1996年，Bogdanovic等发现掺入Ti（OBu^n）4可使NaAlH4在100℃=左右进行可逆吸放氢反应．这一突破性研究激发了人们对以NaAlH4为代表的轻质络合氢化物体系研究的极大兴趣．NaAlH4的吸放氢过程是多步反应：

英文摘要：

In this paper, the microstructure and hydrogen storage properties of the （NaH/Al） ＋ x （ molar fraction, % ） Ti（x = 0, 4, 6, 10） composites were investigated. It was found that the reversible hydrogen storage properties can be improved by mechanically ball-milling the （NaH/Al） mixture together with Ti powder. H2 is a better ball-milling atmosphere than Ar, because a part of Nail is consumed during the ball-milling under an Ar of H2 atmosphere. As the Ti content increases, the hydrogen storage properties are enhanced gradually. In case x = 10, the reversible hydrogen absorption/desorption capacities of the composites milled for 6 h under the atmosphere reach 4.01% and 3.93% （ mass fraction）, respectively. The catalytic mechanism of the Tidoped NaH/Al composites system is discussed briefly.