A novel method for the synthesis of solvent-free Mg(B3H8)2

Sodium borohydride (NaBH4) is regarded as an excellent hydrogen‐generated material, but its irreversibility of hydrolysis and high cost of regeneration restrict its large‐scale application. In this study a convenient and economical method for NaBH4 regeneration is developed for the first time without hydrides used as starting materials for the reduction process. The real hydrolysis by‐products (NaBO2·2H2O and NaBO2·4H2O), instead of dehydrated sodium metaborate (NaBO2), are applied for the regeneration of NaBH4 with Mg at room temperature and atmospheric pressure. Therefore, the troublesome heat‐wasting process to obtain NaBO2 using a drying procedure at over 350 °C from NaBO2·xH2O is omitted. Moreover, the highest regeneration yields of NaBH4 are achieved to date with 68.55% and 64.06% from reaction with NaBO2·2H2O and NaBO2·4H2O, respectively. The cost of NaBH4 regeneration shows a 34‐fold reduction compared to the previous study that uses MgH2 as the reduction agent, where H2 is obtained from a separate process. Furthermore, the regeneration mechanism of NaBH4 is clarified and the intermediate compound, NaBH3(OH), is successfully observed for the first time during the regeneration process.

show abstract

“…[39] Figure 1E shows the morphology of the purified product. [39] Figure 1E shows the morphology of the purified product.…”

Section: Regeneration Of Nabhmentioning

confidence: 99%

Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage

Ouyang

Chen

Liu

et al. 2017

Advanced Energy Materials

Self Cite

353

View full text Add to dashboard Cite

show abstract

“…7 and 8) and BH 4 − (ref. 15 Ouyang et al 16 reported a method for in situ formation of cycle stable CeH 2.73 -MgH 2 -Ni nanocomposites, from the hydrogenation of as-melt Mg 80 Ce 18 Ni 2 alloys. However, when these materials were applied for commercial purposes, MgH 2 and LiBH 4 met with the problems of high dehydrogenation temperature and poor hydriding/ dehydriding kinetics.…”

Section: Introductionmentioning

confidence: 99%

Enhanced hydrogen storage properties of the 2LiBH₄–MgH₂composite with BaTiO₃as an additive

et al. 2016

View full text Add to dashboard Cite

The 2LiBH4-MgH2 + 20 wt% BaTiO3 composite was prepared by ball-milling LiBH4, MgH2 and BaTiO3, and the effect of BaTiO3 on the hydrogen storage properties of the composite was investigated. TG-DSC results show that the onset dehydrogenation temperature of the composite is 299 °C, which is 124 °C lower than that of 2LiBH4-MgH2, and the dehydrogenation amount of the composite increases from 6.86 wt% to 7.48 wt% at 500 °C. Kinetic tests show that the dehydrogenation amount of 2LiBH4-MgH2 + 20 wt% BaTiO3 reaches 1.5 wt% within 400 seconds, almost 10 times that of 2LiBH4-MgH2. BaTiO3 reacts with LiBH4 during the dehydrogenation of the composite and generates BaB6 and TiO2. BaB6 is beneficial to lower the stability of LiBH4, while TiO2 has a catalytic effect in improving the hydrogenation/dehydrogenation kinetics of the reaction between Mg and LiBH4.

show abstract

“…The study on rehydrogenation from the intermediates was mainly focusing on Mg(B 3 H 8 ) 2 . 15,17,18 By controlling the decomposition in a relatively low temperature range from 200 to 285°C, Mg ( 19 Stable closo-borates such as MgB 12 H 12 and stable Mg-B-H polymers have also been widely discussed as the intermediates, which will hinder the reversible hydrogen sorption. 11,12,20 Apparently, the higher the borate formed in the desorption process, the more hydrogen might reversibly be stored.…”

Section: Introductionmentioning

confidence: 99%

On the reversible hydrogen storage in Mg(BH₄)₂ under moderate conditions

2016

Self Cite

View full text Add to dashboard Cite

Mg(BH 4) 2 contains 14.9 mass% of hydrogen and is considered as a promising hydrogen storage material. Reversible hydrogen sorption under moderate conditions represents a main challenge for Mg(BH 4) 2 being utilized for solid-state hydrogen storage. Here, we achieve the reversible storage of 4.0 mass% of hydrogen at 265°C in Mg(BH 4) 2. That is, desorption of 7.5 mass% H at 265°C under vacuum and absorption of 4.0 mass% at 265°C and 160 bar H 2. 11 B MAS NMR measurements indicate that the reversible hydrogen sorption involves the formation of a decisive intermediate which shows a major resonance with a chemical shift at-50.0 ppm. The phase evolution in the hydrogen cycles as well as the capacity loss in the hydrogen sorption cycles is discussed.

show abstract

A novel method for the synthesis of solvent-free Mg(B₃H₈)₂

Abstract: This communication presents a novel and solvent-free method to synthesise Mg(B3H8)2 via the gas-solid reaction between B2H6 and Mg2NiH4, which overcomes the limitations of wet chemical methods requiring solvent removal.

Cited by 35 publications

References 29 publications

Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage

Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage

Enhanced hydrogen storage properties of the 2LiBH₄–MgH₂composite with BaTiO₃as an additive

On the reversible hydrogen storage in Mg(BH₄)₂ under moderate conditions

Contact Info

Product

Resources

About

A novel method for the synthesis of solvent-free Mg(B3H8)2

Abstract: This communication presents a novel and solvent-free method to synthesise Mg(B3H8)2 via the gas-solid reaction between B2H6 and Mg2NiH4, which overcomes the limitations of wet chemical methods requiring solvent removal.

Cited by 35 publications

References 29 publications

Enhancing the Regeneration Process of Consumed NaBH4 for Hydrogen Storage

Enhancing the Regeneration Process of Consumed NaBH4 for Hydrogen Storage

Enhanced hydrogen storage properties of the 2LiBH4–MgH2composite with BaTiO3as an additive

On the reversible hydrogen storage in Mg(BH4)2 under moderate conditions

Contact Info

Product

Resources

About

A novel method for the synthesis of solvent-free Mg(B₃H₈)₂

Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage

Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage

Enhanced hydrogen storage properties of the 2LiBH₄–MgH₂composite with BaTiO₃as an additive

On the reversible hydrogen storage in Mg(BH₄)₂ under moderate conditions