Low-cost method for sodium borohydride regeneration and the energy efficiency of its hydrolysis and regeneration process

Ouyang, Liuzhang; Zhong, Hao; Li, Z.M.; Cao, Zhijie; Wang, H.; Liu, J.W.; Zhu, Xiaoke; Zhu, Min

doi:10.1016/j.jpowsour.2014.07.074

Cited by 129 publications

(53 citation statements)

References 20 publications

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“…Figure 1B shows the XRD patterns of the standard PDF card, commercial NaBH 4 , and the purified product, respectively. [38] In addition, solutionstate (D 2 O + NaOD) 1 H-coupled 11 B NMR spectra ( Figure 1D) were also used to compare the purified product with the commercial product. Figure 1C shows the FT-IR spectra of the purified product and commercial NaBH 4 .…”

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

353

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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.

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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

353

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“…All of their NaBH 4 yields were over 70%, which strongly indicated that ball milling is suitable for the reaction between MgH 2 and NaBO 2 . Based on the thermodynamics calculation, we found the maximum energy efficiency of the cycle was 49.91% [70]. Recently, we found that the addition of hydrogen pressure and methanol could further increase the NaBH 4 yield by this method [71].…”

Section: Nabh 4 Regeneration Via the Reaction Between Metal Or Other mentioning

confidence: 93%

“…By modifying the hydrogenation of Mg using Mg-based alloy, the above issue can be partly solved. Following this observation, we tried to use Mg 3 La hydrides to react with NaBO 2 for its advantage of room temperature hydrogenation and low hydrogen purity requirement and found that NaBH 4 could be produced (Figure 1a) [70]. However, introduction of other elements influences the regeneration reaction of MgH 2 .…”

Section: Nabh 4 Regeneration Via the Reaction Between Metal Or Other mentioning

confidence: 99%

A Recycling Hydrogen Supply System of NaBH4 Based on a Facile Regeneration Process: A Review

Ouyang

Zhong

et al. 2018

Inorganics

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NaBH 4 hydrolysis can generate pure hydrogen on demand at room temperature, but suffers from the difficult regeneration for practical application. In this work, we overview the state-of-the-art progress on the regeneration of NaBH 4 from anhydrous or hydrated NaBO 2 that is a byproduct of NaBH 4 hydrolysis. The anhydrous NaBO 2 can be regenerated effectively by MgH 2 , whereas the production of MgH 2 from Mg requires high temperature to overcome the sluggish hydrogenation kinetics. Compared to that of anhydrous NaBO 2 , using the direct hydrolysis byproduct of hydrated NaBO 2 as the starting material for regeneration exhibits significant advantages, i.e., omission of the high-temperature drying process to produce anhydrous NaBO 2 and the water included can react with chemicals like Mg or Mg 2 Si to provide hydrogen. It is worth emphasizing that NaBH 4 could be regenerated by an energy efficient method and a large-scale regeneration system may become possible in the near future.

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“…Recycling was discussed in Refs [51][52][53][54][55][56][57]. However, this discussion would go beyond the scope of this work.…”

Section: Water Requirementsmentioning

confidence: 99%

A hybrid hydrolytic hydrogen storage system based on catalyst-coated hollow glass microspheres

Schmid

Bauer

Eder

et al. 2016

Int. J. Energy Res.

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Summary Hydrogen‐pressurized hollow glass microspheres (HGMs) in combination with a hydride bear the potential of storing hydrogen in feasible amounts. Therefore, the approximately 20‐µm diameter spheres are heated up and pressurized with hydrogen at a pressure of 85 MPa, so hydrogen diffuses into the spheres. After the spheres are cooled down, hydrogen can be stored at room temperature without excessive security measures. To release the stored hydrogen, heat has to be applied again to reach temperatures of about 250 °C (523.15 K). To reach this temperature, it is suggested in this work to use an exothermal chemical reaction, which produces hydrogen as a by‐product. In this case, an NaBH4–water reaction will be discussed, which has to be initialized by a catalyst deployed on the HGMs. It will be shown that hydrogen storage densities of up to 20 wt% and 50 kg/m3 can be theoretically achieved with the proposed hydrogen storage system consisting of hydrogen‐pressurized HGMs and a hydride, that is, NaBH4. Volumetric storage density and other aspects, such as water management, temperature restriction, stoichiometric restriction and hydrogen diffusion through glass, will be discussed. Due to resulting high water vapour pressures, a pressure vessel will still be needed in the concept. This paper shall give an overview of theoretically achievable storage densities with the proposed system. Experiments were carried out regarding catalytic promoted hydrolysis with HGMs, and resulting storage densities were determined. These experiments show good agreement with theory. However, they will be addressed only briefly in the outlook of the paper because a detailed discussion would go beyond the scope of this work. Copyright © 2016 John Wiley & Sons, Ltd.

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Low-cost method for sodium borohydride regeneration and the energy efficiency of its hydrolysis and regeneration process

Cited by 129 publications

References 20 publications

Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage

Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage

A Recycling Hydrogen Supply System of NaBH4 Based on a Facile Regeneration Process: A Review

A hybrid hydrolytic hydrogen storage system based on catalyst-coated hollow glass microspheres

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Low-cost method for sodium borohydride regeneration and the energy efficiency of its hydrolysis and regeneration process

Cited by 129 publications

References 20 publications

Enhancing the Regeneration Process of Consumed NaBH4 for Hydrogen Storage

Enhancing the Regeneration Process of Consumed NaBH4 for Hydrogen Storage

A Recycling Hydrogen Supply System of NaBH4 Based on a Facile Regeneration Process: A Review

A hybrid hydrolytic hydrogen storage system based on catalyst-coated hollow glass microspheres

Contact Info

Product

Resources

About

Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage

Enhancing the Regeneration Process of Consumed NaBH₄ for Hydrogen Storage