TiZr氢化物掺杂NaAlH₄的储氢性能

来源期刊：中国有色金属学报2008年第4期

论文作者：刘晓鹏 庄鹏辉 李志念 王树茂 蒋利军 李华玲

文章页码：671 - 671

关键词：NaAlH₄；储氢材料；络合氢化物；TiZr合金氢化物

Key words：NaAlH₄; hydrogen storage material; complex hydrides; TiZr alloy hydride

摘    要：采用机械球磨方法在NaAlH₄ 络合氢化物中添加3%(摩尔分数)TiZr合金氢化物，合成复合储氢材料。采用XRD、SEM和等容法储放氢性能测试等技术对该复合储氢材料的形态、物相和可逆储放氢性能进行研究。结果表明：加入TiZr合金氢化物的NaAlH₄ 可以实现可逆吸放氢，同时具有良好的储放氢动力学性能，在160 ℃、0.1 MPa放氢条件下，其总放氢量达4.5%(质量分数)，40 min可逆放氢量超过3.0 %，且具有良好的循环稳定性； NaAlH₄ 基体中均匀弥散分布的TiZr合金氢化物，在复合储氢材料吸放氢前后保持物相和结构不变，对NaAlH₄ 络合氢化物的可逆储放氢反应起到催化改善作用。

Abstract: The hydrogen storage properties of NaAlH₄ doped by 3%(mole fraction) TiZr alloy hydride with ball-milling method was investigated by X-ray diffractometry, scanning electron microscopy and sievert’s technology test. The results show that the TiZr alloy hydride/NaAlH₄ composite has good reversible hydrogen storage properties. The hydrogenation and dehydrogenation kinetics of NaAlH4 can be greatly improved by doping TiZr alloy hydride. The reversible dehydrogenation capacity of this composite reaches to 3.0%(mass fraction) in 40 min and 4.5% in 11 h. The TiZr alloy hydride uniformly distributing in the NaAlH₄ substrate has stable phase structure during the hydrogenation/ dehydrogenation cycle, indicating that the catalytic effect of TiZr alloy hydride is the main mechanism for improving the reversible hydrogen storage properties of NaAlH₄.

基金信息：国家高技术研究发展计划资助项目