LiBH4LiBH4 nanoparticles supported by disordered mesoporous carbon: Hydrogen storage performances and destabilization mechanisms

Zhang, Yao; Zhang, Wansheng; Wang, Aiqin; Sun, Lin; Fan, Meiqiang; Chu, Hailiang; Sun, Juncai; Zhang, Tao

doi:10.1016/j.ijhydene.2007.04.010

Cited by 131 publications

(111 citation statements)

References 21 publications

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“…Actually, the amorphous Na 2 [B 12 H 12 ] has been detected in the desorbed states of nanoconfined NaBH 4 and NaBH 4 ÀMgH 2 composite. 26,27 However, the role of B 12 25 On the other hand, the general chemical inertness of boron and the phase separation will also lead to poor recombination kinetics.…”

Section: Discussionmentioning

confidence: 99%

Hydrogen De-/Absorption Improvement of NaBH₄ Catalyzed by Titanium-Based Additives

et al. 2011

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NaBH 4 is considered as a promising candidate material for solid-state hydrogen storage due to its high hydrogen content of 10.6 wt %. However, its practical use is hampered by its high thermodynamic stability and slow H-exchange kinetics. In the present work, the effects of Ti-based additives, including Ti, TiH 2 , and TiF 3 , on the dehydrogenation and rehydrogenation of NaBH 4 (NaH+B) were investigated. It was revealed that all of the titanium-based additives were effective in improving the hydrogen desorption and absorption reactions of NaBH 4 , and, among them, TiF 3 possessed the highest catalytic activity. The whole dehydrogenation process for the NaBH 4 À0.05TiF 3 sample can be regarded as a two-step process: (i) a preferential reaction (3NaBH 4 + TiF 3 f 3NaF + TiB 2 + B + 6H 2 ) occurring at around 300 °C, and (ii) the formation of Ti-and F-containing species catalyze the dehydrogenation of the remaining NaBH 4 . It was also indicated that the F anion can substitute for anionic H in NaH to form NaF 1Àx H x in the case of NaHÀBÀ0.05TiF 3 during the hydrogenation process. Therefore, the observed promotion effect of TiF 3 on the reversible dehydrogenation of NaBH 4 should be understood as arising from the combined effects of active Ti-and F-containing species. Also, FTIR spectroscopy confirmed the presence of amorphous Na 2 B 12 H 12 , in both the dehydrogenated and the rehydrogenated states, which may play a role in the partial dehydrogenation and reversibility observed in NaBH 4 with and without catalyst doping.

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Section: Discussionmentioning

confidence: 99%

Hydrogen De-/Absorption Improvement of NaBH₄ Catalyzed by Titanium-Based Additives

et al. 2011

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“…Since Bogdanovic et al found that the addition of Ti-based compounds significantly promoted the dehydrogenation-rehydrogenation reactions of NaAlH 4 [193], the development of complex hydrides for hydrogen storage has significantly increased. Stimulated by this finding, a large number of additives from oxides, halides, metals, and carbon-based materials to M(BH 4 ) n have been examined [19,20,58,87,101,130,144,150,161,168,170,171,191,[194][195][196][197][198][199][200][201][202][203][204][205][206][207][208][209][210]; the corresponding dehydrogenation and rehydrogenation properties are summarized in Table 5. For instance, the most effective additive for LiBH 4 was found to be the mixture of 0.2 MgCl 2 + 0.1 TiCl 3 , in which approximately 5 mass% of hydrogen was released from 333 K and 4.5 mass% of hydrogen was rehydrogenated at 873 K in 7 MPa H 2 [195].…”

Section: Promoting Kineticsmentioning

confidence: 99%

Recent Progress in Metal Borohydrides for Hydrogen Storage

et al. 2011

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Abstract:The prerequisite for widespread use of hydrogen as an energy carrier is the development of new materials that can safely store it at high gravimetric and volumetric densities. Metal borohydrides M(BH 4 ) n (n is the valence of metal M), in particular, have high hydrogen density, and are therefore regarded as one such potential hydrogen storage material. For fuel cell vehicles, the goal for on-board storage systems is to achieve reversible store at high density but moderate temperature and hydrogen pressure. To this end, a large amount of effort has been devoted to improvements in their thermodynamic and kinetic aspects. This review provides an overview of recent research activity on various M(BH 4 ) n , with a focus on the fundamental dehydrogenation and rehydrogenation properties and on providing guidance for material design in terms of tailoring thermodynamics and promoting kinetics for hydrogen storage.

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“…Compared with neat LiBH 4 , the LiBH 4 -mesoporous carbon mixture released the majority of H 2 at lower temperatures and could achieve partial reversibility at 350 1C. 272 Gross et al incorporated LiBH 4 into porous carbon of different pore sizes and observed the size-dependence of dehydrogenation kinetics (see Fig. 32).…”

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confidence: 99%

Nanomaterials for renewable energy production and storage

et al. 2012

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Over the past decades, there have been many projections on the future depletion of the fossil fuel reserves on earth as well as the rapid increase in green-house gas emissions. There is clearly an urgent need for the development of renewable energy technologies. On a different frontier, growth and manipulation of materials on the nanometer scale have progressed at a fast pace. Selected recent and significant advances in the development of nanomaterials for renewable energy applications are reviewed here, and special emphases are given to the studies of solar-driven photocatalytic hydrogen production, electricity generation with dye-sensitized solar cells, solidstate hydrogen storage, and electric energy storage with lithium ion rechargeable batteries.

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LiBH4LiBH4 nanoparticles supported by disordered mesoporous carbon: Hydrogen storage performances and destabilization mechanisms

Cited by 131 publications

References 21 publications

Hydrogen De-/Absorption Improvement of NaBH₄ Catalyzed by Titanium-Based Additives

Hydrogen De-/Absorption Improvement of NaBH₄ Catalyzed by Titanium-Based Additives

Recent Progress in Metal Borohydrides for Hydrogen Storage

Nanomaterials for renewable energy production and storage

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LiBH4LiBH4 nanoparticles supported by disordered mesoporous carbon: Hydrogen storage performances and destabilization mechanisms

Cited by 131 publications

References 21 publications

Hydrogen De-/Absorption Improvement of NaBH4 Catalyzed by Titanium-Based Additives

Hydrogen De-/Absorption Improvement of NaBH4 Catalyzed by Titanium-Based Additives

Recent Progress in Metal Borohydrides for Hydrogen Storage

Nanomaterials for renewable energy production and storage

Contact Info

Product

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Hydrogen De-/Absorption Improvement of NaBH₄ Catalyzed by Titanium-Based Additives

Hydrogen De-/Absorption Improvement of NaBH₄ Catalyzed by Titanium-Based Additives