广西科学2019，Vol.26Issue(4)：385-390,6.DOI:10.13656/j.cnki.gxkx.20190808.002
基于X(X=Sc,Ce,Pr,Sm)单质原位球磨合成的NaAlH4储氢性能
Hydrogen Storage Properties of NaAlH4 Prepared Via in-situ Ball-milling Method Based on X (X=Sc,Ce,Pr,Sm)Additive
摘要
Abstract
To improve the hydrogen storage properties of sodium aluminohydride(NaA1H,)，a transitional and rare earth element X element(X=Sc，Ce，Pr，Sm)，NaH and Al were used as reactants. The doped NaA1H4 was synthesized in situ based on a two-step preparation method of pre-ball milling and hydrogenation ball milling. The results of XRD analysis showed that the synthesis effect of NaAlH4 was very good，and dehydrogenation was also carried out thoroughly. Under Sc-doped situation，the hydrogen absorption and desorption performance test showed that the first hydrogen release amount was the highest(up to 5. 2 wt %，reaching 99% of the theoretical capacity)，and there was the best hydrogen absorption kinetics. The capacity retention rate when adding rare earth element was significantly higher than that of adding Sc. When Sm was added，the capacity retention rate was the best. Under Ce-doped situation，the initial dehydrogenation temperature (90℃)was the lowest，and the kinetics of hydrogen absorption was the best among the three rare earth element，but the maximum dehydrogenation capacity was the lowest. None of the four elements could rank the best in all performance. In this paper，doped low-dose element，NaAlH4, synthesized with in-situ method exhibits good hydrogen storage performance. The main reason is that the elemental additive can react with the matrix during the ball milling process，the in situ product can form a tight coupling with the matrix and even activate the matrix from the body to obtain a good catalytic effect.关键词
铝氢化钠/储氢材料/配位氢化物/原位合成/催化效果/稀土元素Key words
sodium aluminium hydride/hydrogen storage materials/complex hydrides/in-situ synthesis/catalytic effects/rare earth elements分类
矿业与冶金引用本文复制引用
丁志强,李俊峰,黄存可,郭进..基于X(X=Sc,Ce,Pr,Sm)单质原位球磨合成的NaAlH4储氢性能[J].广西科学,2019,26(4):385-390,6.基金项目
国家自然科学基金项目(51461003)和广西相对论天体物理重点实验室开放基金项目资助. （51461003）
