将氨气等离子体法制备的50nm左右的Mg3N2纳米颗粒与氨气反应,成功合成出大小约为80nm,球壳厚度约为10nm的Mg（NH2）2纳米空心球。利用Mg（NH2）2纳米空心球制备的Mg（NH2）2＋2LiH储氢体系,比普通Mg（NH2）2＋2LiH具有更低的放氢温度,放氢活化能从149.1kJ/mol降低到了117.6kJ/mol。对该体系添加纳米级的Ni作为催化剂,放氢活化能进一步降低为108.0kJ/mol。反应后生成物颗粒大小取决于反应前Mg（NH2）2颗粒的大小。通过对放氢性能的比较,讨论了影响Mg（NH2）2＋2LiH体系放氢性质的因素和决速步骤。
Mg3N2 nanocubes with particle size about 50nm were synthesized by vaporized bulk magnesium with ammonia plasma metal reaction.Reacted the Mg3N2 nanocubes with NH3,Mg（NH2）2 hollow nanospheres with particle sizes of about 80nm and the shell thickness of about 10nm were successfully synthesized.Hydrogen desorption temperature of Mg（NH2）2＋2LiH system was lowered by use of Mg（NH2）2 hollow nanospheres,and the desorption activation energy was lowered from 149.1 to 117.6kJ/mol.Furthermore,the desorption activation energy was lowered to 108.0kJ/mol by doping with Ni nanoparticles.The particle size of resultant after dehydrogenation lied on the size of Mg（NH2）2.The factors on the hydrogen desorption kinetics of Mg（NH2）2＋2 LiH system were also discussed.
参考文献
| [1] | Chen P;Xiong ZT;Luo JZ;Lin JY;Tan KL .Interaction of hydrogen with metal nitrides and imides[J].Nature,2002(6913):302-304. |
| [2] | Ping Chen;Zhitao Xiong;Jizhong Luo;Jianyi Lin;Kuang Lee Tan .Interaction between Lithium Amide and Lithium Hydride[J].The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical,2003(39):10967-10970. |
| [3] | Orimo S;Nakamori Y;Kitahara G;Miwa K;Ohba N;Noritake T;Towata S .Destabilization and enhanced dehydriding reaction of LiNH2: an electronic structure viewpoint[J].Applied physics, A. Materials science & processing,2004(7):1765-1767. |
| [4] | Zhitao Xiong;Ping Chen;Guotao Wu;Jianyi Lin;Kuang Lee Tan .Investigations into the interaction between hydrogen and calcium nitride[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2003(7):1676-1680. |
| [5] | Shin-ichi Orimo;Yuko Nakamori;Jennifer R. Eliseo;Andreas Züttel;Craig M. Jensen .Surface and Interface Sciences, Sandia National Laboratories, P.O. Box 5800, M.S. 1415, Albuquerque, New Mexico 87185[J].Chemical Reviews,2007(10):4111-4132. |
| [6] | Huaiyu Shao;Hairuo Xu;Yuntao Wang .Preparation and hydrogen storage properties of Mg_2Ni intermetallic nanoparticles[J].Nanotechnology,2004(3):269-274. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%