TiZr氢化物掺杂NaAlH4的储氢性能.pdfVIP

第l8卷第4期 中国有色金属学报 2008年4月 、，01．18 No．4 The Chinese Journal of Nonferrous Metals Apr．2008 文章编号：1004—0609(2008)04—067 1—05 TiZr氢化物掺杂NaAIH4的储氢性能 庄鹏辉，刘晓鹏，李志念，王树茂，蒋利军，李华玲 (北京有色金属研究总院 能源材料与技术研究所，北京 100088) 摘 要：采用机械球磨方法在NaAII-I4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NaALr~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： NaAlI-h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NaAIH4络 合氢化物的可逆储放氢反应起到催化改善作用。 关键词：NaAIH4：储氢材料；络合氢化物：TiZr合金氢化物 中图分类号：TG 139 文献标识码：A Hydrogen storage properties of NaAIH4 doped by Ti-Zr alloy hydride ZHUANG Peng-hui，LIU Xiao-peng，LI Zhi-nian，WANG Shu-mao，JIANG Li-jun，LI Hna-ling (Research Center of Energy Material and Technology，General Research Institute for Non-ferrous Metals， Beijing 100088，China) Abstract：The hydrogen storage properties of NaAII-L#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．Th e results show that the TiZr alloy hydride／NaAlI-h composite has good reversible hydrogen storage properties．The hydrogenation and dehydrogenation kinetics of NaAII-L#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 ll h．The TiZr alloy hydride uniformly distributing in the NaAII-L#substrate has stable phase structure during the hydrogenation／ dehydrogenation cycle，indicating that the catalytic effect of TiZr alloy hydride is