NDLI: Enhanced hydrogen storage properties of NaAlH<sub>4</sub> co-catalysed with niobium fluoride and single-walled carbon nanotubes

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Enhanced hydrogen storage properties of NaAlH₄ co-catalysed with niobium fluoride and single-walled carbon nanotubes

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RSC Advances Vol -1

RSC Advances Vol -0

Enhanced hydrogen storage properties of NaAlH₄ co-catalysed with niobium fluoride and single-walled carbon nanotubes

Content Provider	Royal Society of Chemistry (RSC)
Author	Guo, Zaiping Mao, Jianfeng Liu, Huakun
Copyright Year	2012
Abstract	The effects of single-walled carbon nanotubes (SWCNTs) as a co-catalyst with NbF5 on the dehydrogenation and hydrogenation kinetics of NaAlH4 were investigated by X-ray diffraction, Fourier transform infrared spectroscopy, differential thermal analysis, temperature-programmed desorption, and isothermal hydrogen ab/desorption techniques. It has been revealed that there is a synergistic effect of SWCNTs and NbF5 on the de/rehydrogenation of NaAlH4, which improves the hydrogen de/absorption performance when compared to adding either SWCNTs or NbF5 alone. For example, the apparent activation energy for the first-step and the second-step dehydrogenation of the co-doped NaAlH4 sample is estimated to be 85.9 and 96.2 kJ mol−1, respectively, using Kissinger's approach, which is lower than the pristine, SWCNT-, and NbF5 doped NaAlH4, respectively, indicating a reduced kinetic barrier. These results are attributed to the active Nb-containing species and the function of F anions, as well as the nanosized pores and high specific surface area of the SWCNTs, which facilitates the dissociation and recombination of hydrogen molecules on its surface and the atomic hydrogen diffusion along the grain boundaries and inside the grains, and decreases the segregation of bulk Al after the desorption. Hence, the combined catalytic mechanism is presented.
Starting Page	1569
Ending Page	1576
Page Count	8
File Format	HTM / HTML PDF
ISSN	20462069
Volume Number	2
Issue Number	4
Journal	RSC Advances
DOI	10.1039/c1ra00645b
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Infrared spectroscopy Isothermal process Carrier generation and recombination Crystallite Specific surface area Differential thermal analysis Dissociative Hydrogenation Carbon nanotube X-ray crystallography Fourier Dehydrogenation Henry Kissinger Kissinger Diffusion Activation energy
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering

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Enhanced hydrogen storage properties of NaAlH4 co-catalysed with niobium fluoride and single-walled carbon nanotubes

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CARBON NANOMATERIALS AS CATALYSTS FOR HYDROGEN UPTAKE AND RELEASE IN NAALH4

Feedstock Diffusion and Decomposition in Aligned Carbon Nanotube Arrays

Enhanced hydrogen storage properties of NaAlH₄ co-catalysed with niobium fluoride and single-walled carbon nanotubes

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