高等学校化学学报 ›› 2016, Vol. 37 ›› Issue (10): 1757.doi: 10.7503/cjcu20160468

• 研究论文: 无机化学 • 上一篇    下一篇

h-BN负载纳米NbH对LiBH4放氢性能的协同改性作用

屠国平1,2, 何剑灵2, 肖学章1, 陈立新1(), 任钱江2, 杜锡勇2, 骆明儿2   

  1. 1. 浙江大学材料科学与工程学院, 杭州 310027
    2. 绍兴市质量技术监督检测院, 绍兴 312071
  • 收稿日期:2016-07-01 出版日期:2016-10-10 发布日期:2016-09-23
  • 作者简介:联系人简介: 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:
    国家自然科学基金(批准号: 51471151, 51571179, 51671173)资助

Synergetic Effect of NbH@h-BN on Dehydrogenation of LiBH4

TU Guoping1,2, HE Jianling2, XIAO Xuezhang1, CHEN Lixin1,*(), REN Qianjiang2, DU Xiyong2, LUO Minger2   

  1. 1. School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China
    2. Shaoxing Testing Institute of Quality Technical Supervision, Shaoxing 312071, China
  • Received:2016-07-01 Online:2016-10-10 Published:2016-09-23
  • Contact: CHEN Lixin E-mail:lxchen@zju.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.51471151, 51571179, 51671173)

摘要:

制备了h-BN负载纳米NbH改性剂(NbH@h-BN), 并采用X射线衍射(XRD)、 X射线光电子能谱(XPS)、 透射电子显微镜(TEM)以及X射线能谱(EDS)等测试手段对其进行表征, 分析了NbH@h-BN对LiBH4放氢反应的掺杂改性作用及机理. 结果表明: 经NbH@h-BN掺杂改性后, LiBH4的放氢峰值温度和表观活化能分别降低至380 ℃和142.31 kJ/mol, 放氢动力学性能也得到大幅改善. 分析认为: NbH@h-BN具备协同改性LiBH4的放氢性能是因为NbH@h-BN可以生成稳定的粒径为5~10 nm的NbH颗粒, 并且可以避免纳米NbH在掺杂改性过程和放氢过程中发生团聚, 能够充分发挥纳米NbH和h-BN各自的改性作用.

关键词: 储氢材料, 硼氢化锂, 协同效应

Abstract:

NbH@h-BN was prepared by mechanically milling h-BN, NbCl5 and LiH, and the samples were detected by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), transmission electron microscopy(TEM) and energy dispersive spectrometry(EDS). The enhancement of NbH@h-BN on the dehydrogenation of LiBH4 and its mechanism were investigated. The results showed that the onset dehydroge-nation temperature and the apparent activation energy(Ea) of LiBH4 were reduced to 380 ℃ and 142.31 kJ/mol respectively after the addition of NbH@h-BN, and the dehydrogenation kinetics of LiBH4 was improved significantly. These remarkable results are largely attributed to the nano NbH particles which were dispersed on the surface of h-BN stably.

Key words: Hydrogen storage material, LiBH4, Synergetic effect

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