高等学校化学学报 ›› 2013, Vol. 34 ›› Issue (10): 2347.doi: 10.7503/cjcu20130449

• 物理化学 • 上一篇    下一篇

MgH2粒径对2LiBH4+MgH2体系放氢动力学性能的影响

寇化秦1,2, 桑革1, 陈立新2, 肖学章2, 邓帅帅2, 黄志勇3   

  1. 1. 表面物理与化学重点实验室, 绵阳 621907;
    2. 浙江大学材料科学与工程系, 杭州 310027;
    3. 中国工程物理研究院, 绵阳 621900
  • 收稿日期:2013-05-13 出版日期:2013-10-10 发布日期:2013-10-10
  • 作者简介:陈立新,男,博士,教授,博士生导师,主要从事储氢材料研究.E-mail:lxchen@zju.edu.cn
  • 基金资助:

    国家“九七三”计划项目(批准号:2011GB111003, 2010CB631300)、国家自然科学基金(批准号:51171173, 51001090)和四川材料与工艺研究所基金(批准号:SJ201104)资助.

Grain Size Effect of MgH2 on Dehydrogenation Kinetics of 2LiBH4+MgH2 System

KOU Hua-Qin1,2, SANG Ge1, CHEN Li-Xin2, XIAO Xue-Zhang2, DENG Shuai-Shuai2, HUANG Zhi-Yong3   

  1. 1. Science and Technology on Surface Physics and Chemistry Laboratory, Mianyang 621907, China;
    2. Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;
    3. China Academy of Engineering Physics, Mianyang 621900, China
  • Received:2013-05-13 Online:2013-10-10 Published:2013-10-10

摘要:

研究了MgH2粒径对2LiBH4+MgH2体系放氢动力学性能的影响.采用高能球磨方式对50~100 μm 粒径的MgH2预球磨96 h, 其粒径可减小到100~200 nm.结果表明, 对MgH2进行预球磨可使2LiBH4+MgH2体系的两步放氢温度分别降低58和24℃, 并可明显提高体系的放氢动力学性能.XRD结果表明, MgH2粒径的减小有利于放氢过程中MgB2 的生成, 从而提高体系放氢产物的可逆吸氢能力.

关键词: LiBH4, MgH2, 储氢, 动力学, 粒径

Abstract:

Grain size effect of MgH2 on dehydrogenation kinetics of the 2LiBH4+MgH2 system was investigated. Experimental results show that the grain size of MgH2 is significantly reduced to 100—200 nm after pre-ball milling for 96 h. It was found that these two step dehydrogenation temperature of 2LiBH4+MgH2 system was lowered by 58 and 24℃ respectively through pre-ball milling MgH2. Meanwhile, the desorption rate was improved obviously as the grain size of MgH2 decreased. X-Ray diffraction(XRD) analysis indicates that the formation of MgB2 in dehydrided products is promoted by decreasing the grain size of MgH2, resulting in an improved reversibility.

Key words: LiBH4, MgH2, Hydrogen storage, Kinetics, Grain size

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