Comprehensive Study of Melt Infiltration for the Synthesis of NaAlH4/C Nanocomposites

被引：74

作者：

Adelhelm, Philipp ^{[1
]}

Gao, Jinbao ^{[1
]}

Verkuijlen, Margriet H. W. ^{[2
]}

Rongeat, Carine ^{[3
]}

Herrich, Monika ^{[3
]}

van Bentum, P. Jan M. ^{[2
]}

Gutfleisch, Oliver ^{[3
]}

Kentgens, Arno P. M. ^{[2
]}

de Jong, Krijn P. ^{[1
]}

de Jongh, Petra E. ^{[1
]}

机构：

[1] Univ Utrecht, Debye Inst Nanomat Sci, NL-3584 CA Utrecht, Netherlands

[2] Radboud Univ Nijmegen, Phys Chem Solid State NMR, NL-6525 ED Nijmegen, Netherlands

[3] IFW Dresden, Inst Metall Mat, D-01171 Dresden, Germany

来源：

CHEMISTRY OF MATERIALS | 2010年 / 22卷 / 07期

关键词：

REVERSIBLE HYDROGEN STORAGE; SODIUM ALANATES; ALUMINUM HYDRIDES; CARBON NANOTUBES; DOPED NAALH4; NANOPARTICLES; BEHAVIOR; KINETICS; SILICA;

D O I：

10.1021/cm902681d

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：

In the search for suitable solid state hydrogen storage systems, NaAlH4 (7.4 wt % H-2) holds great promise due to its suitable thermodynamical properties. However, hydrogen release and uptake are hampered by high activation energies, most likely due to solid state mass transfer limitations. A recent strategy to improve the hydrogen de- and rehydrogenation properties of NaAlH4 is to reduce the particle size to the nanometer scale. We prepared high loadings of nanosized NaAlH4 confined in the pores of a carbon support by melt infiltration. XRD, nitrogen physisorption, high pressure DSC and solid-state NMR are used to evidence that the molten NaAlH4 infiltrates the carbon support, and forms a nanosized NaAlH4 phase lacking long-range order. The confined NaAlH4 shows enhanced hydrogen dehydrogenation properties and rehydrogenation under mild conditions that is attributed to the nanosize and close contact to the carbon matrix.

引用

页码：2233 / 2238

页数：6

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