研究了在Zintl相SrAl2合金中添加不同金属氯化物催化剂后的相结构和吸氢动力学性能。XRD分析表明,合金吸氢前仍然为SrAl2相,催化剂由于含量较少未被检测出;吸氢后,合金相结构根据催化剂添加种类的不同分为以下两种情况：氢化程度高的样品,由SrAl2H2、SrAl4和SrH2三相组成;氢化程度低的样品,由SrAl2H2、SrAl4、SrH2和未反应的SrAl2四个相组成。储氢性能研究表明,添加金属氯化物催化剂能够有效改善SrAl2合金的吸氢动力学性能。吸氢动力学机理分析表明,SrAl2合金吸氢控制步骤为表面化学反应,而添加催化剂使得合金的吸氢控制步骤转变为三维扩散。
Crystal structure and hydrogenation kinetics of the Zintl phase SrAl2 doped with various metal chlorides were studied.X-ray diffractometry（XRD） results indicate the alloy is composed of SrAl2 phase regardless of the doped catalyst.After hydrogenation,the alloy either consists of SrAl2H2,SrAl4 and SrH2,or consists of SrAl2H2,SrAl4,SrH2 and unreacted SrAl2 depending on the type of catalyst.Hydrogenation measurements show that the hydrogen absorption kinetics of the SrAl2 alloy is improved effectively by doping with metal chlorides.Hydrogenation mechanism analysis reveals that the control step for hydrogenation of the SrAl2 alloy is surface chemical reaction,while it changes to 3D diffusion for the alloy after adding catalyst.
参考文献
| [1] | Schlapbach L;Zttel A .Hydrogen-storage materials formobile applications[J].Nature,2001,414:353-358. |
| [2] | H.G. Pan;Y.F. Liu;M.X. Gao .Function of cobalt in the new type rare-earth Mg-based hydrogen storage electrode alloys[J].Intermetallics,2005(7):770-777. |
| [3] | 柳东明,韦涛,李李泉.氢化燃烧合成Mg-Mg2Ni储氢合金组成和性能研究[J].材料科学与工程学报,2005(06):818-821. |
| [4] | 张琰,王新华,方国华,李寿权,陈立新,陈长聘.用于超高压化学热压缩的稀土储氢合金研究[J].材料科学与工程学报,2006(01):97-100. |
| [5] | Hel molta R.V;Eberle U .Fuel cell vehicles:Status 2007[J].Journal of Power Sources,2007,165(02):833-843. |
| [6] | 葛红卫,刘剑,范修林,杭州明,陈长聘,陈立新.（Ti-Cr）40V55Zr5储氢合金的热处理改性[J].材料科学与工程学报,2008(04):567-569,553. |
| [7] | Wu H .Strategies for the Improvement of the Hydrogen Storage Properties of Metal Hydride Materials[J].Chemphyschem: A European journal of chemical physics and physical chemistry,2008(15):2157-2162. |
| [8] | Ritter J.A;Ebner A.D;Wang J;Zidan R .Implementinga Hydrogen Economy[J].Materials Today,2003,6(09):18-23. |
| [9] | Gingl F.;Vogt T. .Trigonal SrAl_2H_2: the first Zint1 phase hydride[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2000(1/2):127-132. |
| [10] | Zhang QA.;Nakamura Y.;Oikawa K.;Kamiyama T.;Akiba E. .Synthesis and crystal structure of Sr2AlH7: A new structural type of alkaline earth aluminum hydride[J].Inorganic Chemistry: A Research Journal that Includes Bioinorganic, Catalytic, Organometallic, Solid-State, and Synthetic Chemistry and Reaction Dynamics,2002(25):6547-6549. |
| [11] | Q. A. Zhang;E. Akiba .Phase relations and hydrogenation behavior of Sr(Al_(1-x)Mg_x)_2[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2003(1/2):143-150. |
| [12] | Yunfeng Zhu;Feng Hua;Wei Zhang;Liquan Li .Structural And Hydrogenation Properties Of Sral_(2-x)ni_x Alloys[J].International journal of hydrogen energy,2008(24):7498-7504. |
| [13] | Zhu Y.F;Zhang W;Hua F;Li L.Q et al.Effect of Sisubstitution for Al on the structural and hydrogenationproperties of the Zintl phase alloy SrAl2[J].Journal of Alloys and Compounds,2009,485(1-2):439-443. |
| [14] | Bogd anovicB;Schwickardi M .Ti-doped alkali metal aluminiumhydrides as potential novel reversible hydrogen storage materials[J].Journal of Alloys and Compounds,1997,253-254:1-9. |
| [15] | Zhu Y.F;Zhang W;Liu Z.B;Li L.Q .Hydrogenstorage properties of the Zintl phase alloy SrAl2doped with TiF3[J].Journal of Alloys and Compounds,2009,492(1-2):277-281. |
| [16] | D. L. Anton .Hydrogen desorption kinetics in transition metal modified NaAlH_4[J].Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics,2003(0):400-404. |
| [17] | 李谦 .镁基合金氢化反应的物理化学[D].北京科技大学,2004. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%