Cycling properties of Sc- and Ce-doped NaAlH4 hydrogen storage materials prepared by the one-step direct synthesis method

Bogdanović, Borislav; Felderhoff, Michael; Pommerin, A.; Schüth, Ferdi; Spielkamp, Nick; Stark, Arne

doi:10.1016/j.jallcom.2008.03.106

Cited by 72 publications

(53 citation statements)

References 17 publications

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“…It was noted [3] that NaAlH 4 seems to be closest to the demands for automotive applications in combination with advanced fuel cells working at 150°C. However, the heat management for absorption/desorption at these temperatures brings about additional difficulties and the calculations show [17] that the total weight of the storage tank increases by a factor of 1.6-2.…”

Section: Processes In Isotopes Andmentioning

confidence: 99%

“…A large number of studies recently reviewed [2] have been focused on a wide range of catalysts and procedures, aiming to lower the desorption temperature and to increase the desorption rates. Ballmilling with doping agents proved to result both in high capacity reversible storage with excellent kinetics and a "one-step direct synthesis method" from NaH and Al powder [3]. A loss of capacity appears due to the irreversible reaction between the hydride and some dopants [4,5] which led to investigations of various forms of carbon as catalyst [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen desorption from NaAlH₄catalyzed by ball-milling with carbon nanofibers

Lupu

Blăniţă

Mişan

et al. 2009

J. Phys.: Conf. Ser.

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Section: Processes In Isotopes Andmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hydrogen desorption from NaAlH₄catalyzed by ball-milling with carbon nanofibers

Lupu

Blăniţă

Mişan

et al. 2009

J. Phys.: Conf. Ser.

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“…(6) Transition metals have been shown to significantly improve kinetics and reduction of dehydrogenation temperatures in many hydrogen storage systems, including NaAlH 4 [4][5][6][7][8], MgH 2 [9][10][11][12], the 1:1 MgH 2 :LiNH 2 [2,13] and 2:1 LiNH 2 :MgH 2 [14]. Through the electronic structure and total energy calculation using first principle calculations on the effect of titanium on MgH 2 , Song et al found that the bond between magnesium and hydrogen was weakened [15].…”

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confidence: 99%

The effects of halide modifiers on the sorption kinetics of the Li-Mg-N-H System

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Gray

Lascola

et al. 2012

International Journal of Hydrogen Energy

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The effects of different transition metal halides (TiCl 3 , VCl 3 , ScCl 3 and NiCl 2 ) on the sorption properties of the 1:1 molar ratio of LiNH 2 to MgH 2 are investigated. The modified mixtures were found to contain LiNH 2 , MgH 2 and LiCl. TGA results showed that the hydrogen desorption temperature was reduced with the modifier addition in this order: TiCl 3 > ScCl 3 > VCl 3 > NiCl 2 . Ammonia release was not significantly reduced resulting in a weight loss greater than the theoretical hydrogen storage capacity of the material. The isothermal sorption kinetics of the modified systems showed little improvement after the first dehydrogenation cycle over the unmodified system but showed drastic improvement in rehydrogenation cycles. X-ray diffraction and Raman spectroscopy identified the cycled material to be composed of LiH, MgH 2 , Mg(NH 2 ) 2 and Mg 3 N 2 .

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“…The rehydrogenation properties of doped NaAlH 4 are outstanding compared to any other complex aluminum hydride. Rehydrogenation times of 3-5 min have been achieved [133]. However, certain problems have to be faced with respect to the requirements of low temperature (LT) fuel cells for transportation systems.…”

Section: Role Of Catalystsmentioning

confidence: 99%

Complex Hydrides

and

Felderhoff

2010

Handbook of Hydrogen Storage

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Complex hydrides are salt-like materials in which hydrogen is covalently bound to the central atoms, in this way a crystal structure consisting of so-called complex anions is formed. In general, complex hydrides have the chemical formula A x Me y H z . Compounds where position A is preferentially occupied by elements of the first and second groups of the periodic table and Me is occupied either by boron or aluminum are well known and have been intensively investigated. However, another possibility is that complex hydrides are built by transition metal cations. Complex metal hydrides have been known for more than 50 years, but for many years they were not considered for reversible hydrogen storage due to the high kinetic barriers of the decomposition requiring high temperatures. The situation changed in 1997 when Bogdanovi c and Schwickardi discovered that the kinetic barrier of the decomposition of the complex metal hydride, NaAlH 4 , can be lowered by the addition of Ti catalysts and that the material becomes reversible close to acceptable technical conditions [1]. They further showed not only that catalysts can enhance the kinetics of dehydrogenation but also that rehydrogenation under moderate conditions becomes feasible. This breakthrough induced the publication of a tremendous number of papers focusing on the synthesis and the properties of complex hydrides. The major goal is to understand the basic steps of dehydrogenation and rehydrogenation and the role of catalysts. Many complex metal hydrides have high hydrogen gravimetric storage capacities and some of them are commercially available. Some complex hydride systems, such as Mg 2 FeH 6 and Al(BH 4 ) 3 , have an extremely high volumetric hydrogen density of up to 150 kg m À3 . Compared to liquid hydrogen with a volumetric density of 70 kg m À3 , the amount of hydrogen in such metal hydrides is much higher. This makes complex transition metal hydrides interesting as potential storage materials.Handbook of Hydrogen Storage. Edited by Michael Hirscher

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Cycling properties of Sc- and Ce-doped NaAlH4 hydrogen storage materials prepared by the one-step direct synthesis method

Cited by 72 publications

References 17 publications

Hydrogen desorption from NaAlH₄catalyzed by ball-milling with carbon nanofibers

Hydrogen desorption from NaAlH₄catalyzed by ball-milling with carbon nanofibers

The effects of halide modifiers on the sorption kinetics of the Li-Mg-N-H System

Complex Hydrides

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Cycling properties of Sc- and Ce-doped NaAlH4 hydrogen storage materials prepared by the one-step direct synthesis method

Cited by 72 publications

References 17 publications

Hydrogen desorption from NaAlH4catalyzed by ball-milling with carbon nanofibers

Hydrogen desorption from NaAlH4catalyzed by ball-milling with carbon nanofibers

The effects of halide modifiers on the sorption kinetics of the Li-Mg-N-H System

Complex Hydrides

Contact Info

Product

Resources

About

Hydrogen desorption from NaAlH₄catalyzed by ball-milling with carbon nanofibers

Hydrogen desorption from NaAlH₄catalyzed by ball-milling with carbon nanofibers