Influence of Transition Metal Additives on the Hydriding/Dehydriding Critical Point of NaAlH4

被引：23

作者：

Huang, C. K. ^{[1
]}

Zhao, Y. J. ^{[1
,2
]}

Sun, T. ^{[1
]}

Guo, J. ^{[3
]}

Sun, L. X. ^{[4
]}

Zhu, M. ^{[1
]}

机构：

[1] S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China

[2] S China Univ Technol, Dept Phys, Guangzhou 510640, Guangdong, Peoples R China

[3] Guangxi Univ, Coll Phys Sci & Technol, Nanning 530004, Peoples R China

[4] Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 22期

关键词：

HYDROGEN STORAGE PROPERTIES; X-RAY-DIFFRACTION; DEHYDROGENATION PROPERTIES; SODIUM ALANATE; DOPED NAALH4; TI; DECOMPOSITION; TITANIUM; HYDRIDE; MAGNESIUM;

D O I：

10.1021/jp808775v

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of transition metals (TMs) on the hydriding/dedydriding critical point of NaAlH4 has been studied using the chemical potential method. The theoretical results predict that, if the reaction system reaches equilibrium, most of the TM additives significantly increase its hydriding/dedydriding critical point in the sequence Pd > Co > Zr > Ni > Nb > Hf > Ti > Mn > Fe > V > Cu > Cr and therefore have destabilizing effects on NaAlH4 in the same sequence. Experimentally, the isothermal dehydriding kinetics of NaAlH4 is studied only with Fe, Ti, and FeTi additives. The experimental results show that the destabilizing effect of Fe and Ti additives with coarse particles is very low while more effective destabilizing ability is achieved with fine FeTi particles. These experimental results suggest that the predicted destabilizing effect of TM additive is hindered kinetically due to the coarse particles of additives, and therefore experimental verification of the destabilizing effect of TMs should be performed with nanosized particles.

引用

页码：9936 / 9943

页数：8

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