LiAlH4/4MgH2+5%M(M=0, NbSi2, Ni2Si, Nb2O5)复合材料的制备和储氢性能*

doi:10.11901/1005.3093.2016.132

材料研究学报

2016, Vol. 30

Issue (10): 781-786 DOI: 10.11901/1005.3093.2016.132

研究论文

本期目录 | 过刊浏览

LiAlH₄/4MgH₂+5%M(M=0, NbSi₂, Ni₂Si, Nb₂O₅)复合材料的制备和储氢性能*

黄显吞(

),卿培林,覃昌生

百色学院材料科学与工程学院百色 533000

Preparation and Hydrogen Storage Performance of Composite Materials of LiAlH₄/4MgH₂+5%M(M=0, NbSi₂, Ni₂Si, Nb₂O₅)

Xiantun HUANG(

),Peilin QING,Changsheng QIN

Department of Materials Science and Engineering, Baise College, Baise 533000, China

引用本文:

黄显吞,卿培林,覃昌生. LiAlH₄/4MgH₂+5%M(M=0, NbSi₂, Ni₂Si, Nb₂O₅)复合材料的制备和储氢性能*[J]. 材料研究学报, 2016, 30(10): 781-786.
Xiantun HUANG, Peilin QING, Changsheng QIN. Preparation and Hydrogen Storage Performance of Composite Materials of LiAlH₄/4MgH₂+5%M(M=0, NbSi₂, Ni₂Si, Nb₂O₅)[J]. Chinese Journal of Materials Research, 2016, 30(10): 781-786.

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摘要:

应用机械合金化技术制备LiAlH₄/4MgH₂以及LiAlH₄/4MgH₂+5%M(质量分数, M = NbSi₂, Ni₂Si, Nb₂O₅)复合材料, 并对其组织、热性质以及吸放氢动力学进行了表征。结果表明, 添加NbSi₂、Ni₂Si和Nb₂O₅能提高复合材料的吸放氢动力学性能和改善热力学性质。添加NbSi₂、Ni₂Si和Nb₂O₅使复合材料的氢化反应低温段的峰值温度分别降低了19 K、15 K和23 K, 使复合物放氢反应的表观活化能从145.71 kJ/mol分别降低到142.12 kJ/mol和115.12 kJ/mol。

关键词 ：复合材料, LiAlH4, 催化剂, 储氢性能

Abstract：

Composite materials of LiAlH₄/4MgH₂+5% (mass fraction) M (M = NbSi₂, Ni₂Si and Nb₂O₅respectively) were prepared by mechanical alloying in hydrogen atmosphere, and the hydrogen storage properties of the composite materials, as well as LiAlH₄ and MgH₂were investigated. The results show that the kinetics property and thermodynamic property of the 4MgH₂/TiH₂ can be improved by adding NbSi₂, Ni₂Si and Nb₂O₅respectively. DTA curves (by a heating rate 5 K/min) show that the peak temperature within the low temperature range of the hydrogenation for the corresponding composite materials decreased by 19 K, 15 K and 23 K respectively, especially the catalyst effect of which become more obvious after adding Ni₂Si and Nb₂O₅. The activation energy of the LiAlH₄/4MgH₂ composite is 145.71 kJ/mol, however, after adding Ni₂Si and Nb₂O_5,which decreases to 142.12 kJ/mol and 115.12 kJ/mol respectively.

Key words： composite LiAlH4 catalyst hydrogen storage performance

收稿日期: 2016-03-14

基金资助:* 广西自然科学基金2014GXNSFAA118346和广西高校特色专业及课程一体化建设GXTSZY024资助项目

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图1 LiAlH4/4MgH2以及LiAlH4/4MgH2+5%M(M=NbSi2, Ni2Si, Nb2O5)复合材料的XRD谱

图2 LiAlH4/4MgH2以及LiAlH4/4MgH2+5%M(M=NbSi2, Ni2Si, Nb2O5)复合材料的SEM照片

图3 LiAlH4/4MgH2以及LiAlH4/4MgH2+5%M(M=NbSi2, Ni2Si, Nb2O5)复合材料的红外光谱

图4 LiAlH4/4MgH2以及LiAlH4/4MgH2+5%M(M=NbSi2, Ni2Si, Nb2O5)复合材料的吸氢动力学

图5 LiAlH4/4MgH2+5%NbSi2复合材料在573 K、598 K、623 K、648 K的吸氢动力学

图6 LiAlH4/4MgH2+5%NbSi2复合材料的吸氢ln[-ln(1-a)]和lnt关系曲线

图7 LiAlH4/4MgH2+5%NbSi2复合材料的吸氢(1000/RT)-lnk曲线

图8 LiAlH4/4MgH2+5%M(M=0, NbSi2, Ni2Si, Nb2O5)复合材料的DTA曲线

图9 LiAlH4/4MgH2+5%M(M=0, NbSi2, Ni2Si, Nb2O5)复合材料的Kissinger方程曲线

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