Enhanced hydrogen storage performances of NaBH4-MgH2 system

J. F. Mao; X. B. Yu; Z. P. Guo; H. K. Liu; Z. Wu; J. Ni

doi:10.1016/j.jallcom.2009.01.012

Enhanced hydrogen storage performances of NaBH₄-MgH₂ system

J. F. Mao, X. B. Yu, Z. P. Guo, H. K. Liu, Z. Wu, J. Ni

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

99 Citations (Scopus)

Abstract

The hydrogen storage properties of 2NaBH₄ + MgH₂ system were studied. It was found that the presence of MgH₂ could destabilize the decomposition of NaBH₄, decreasing the dehydrogenation temperature about 40 °C compared with the pure NaBH₄. It is believed that the formation of MgB₂ upon dehydrogenation stabilizes the dehydrogenated state and, thereby, destabilizes the NaBH₄. For the desorption the following two-step reaction was observed: 2NaBH₄ + MgH₂ → 2NaBH₄ + Mg + H₂ → 2NaH + MgB₂ + 4H₂. Furthermore, various catalysts such as TiF₃, TiO₂, Zr, Si and BCC alloy were doped to the NaBH₄-MgH₂ system. Among these catalysts, TiF₃ exhibited the optimum behavior in terms of fast kinetics and lowering the dehydrogenation temperature of the NaBH₄-MgH₂ system. The rehydrogenation experiments of TiF₃-doped NaBH₄-MgH₂ system were investigated at 600 °C with an initial hydrogen pressure of about 4 MPa. It showed that 5.89 wt.% hydrogen was rehydrogenated within 12 h. XRD results demonstrated the formation of NaBH₄ and MgH₂ in the rehydrogenated sample. © 2009 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	619-623
Journal	Journal of Alloys and Compounds
Volume	479
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2009.01.012
Publication status	Published - 24 Jun 2009
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to <a href="mailto:[email protected]">[email protected]</a>.

Funding

This work was partially supported by the Hi-Tech Research and Development Program of China (2007AA05Z107), the Shanghai Leading Academic Discipline Project (B113), the Shanghai Rising-Star Program (05QMX1463), and the Shanghai Pujiang Program (08PJ14014), as well as the Australian ARC Discovery project (DP0771193) and the CSIRO Flagship Program.

Research Keywords

Ball milling
Catalyst doping
Hydrogen storage characteristics
Magnesium hydride
Sodium borohydride

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Cite this

@article{16237273f9e54cd0a088d6e3c069b95e,

title = "Enhanced hydrogen storage performances of NaBH4-MgH2 system",

abstract = "The hydrogen storage properties of 2NaBH4 + MgH2 system were studied. It was found that the presence of MgH2 could destabilize the decomposition of NaBH4, decreasing the dehydrogenation temperature about 40 °C compared with the pure NaBH4. It is believed that the formation of MgB2 upon dehydrogenation stabilizes the dehydrogenated state and, thereby, destabilizes the NaBH4. For the desorption the following two-step reaction was observed: 2NaBH4 + MgH2 → 2NaBH4 + Mg + H2 → 2NaH + MgB2 + 4H2. Furthermore, various catalysts such as TiF3, TiO2, Zr, Si and BCC alloy were doped to the NaBH4-MgH2 system. Among these catalysts, TiF3 exhibited the optimum behavior in terms of fast kinetics and lowering the dehydrogenation temperature of the NaBH4-MgH2 system. The rehydrogenation experiments of TiF3-doped NaBH4-MgH2 system were investigated at 600 °C with an initial hydrogen pressure of about 4 MPa. It showed that 5.89 wt.% hydrogen was rehydrogenated within 12 h. XRD results demonstrated the formation of NaBH4 and MgH2 in the rehydrogenated sample. {\textcopyright} 2009 Elsevier B.V. All rights reserved.",

keywords = "Ball milling, Catalyst doping, Hydrogen storage characteristics, Magnesium hydride, Sodium borohydride",

author = "Mao, {J. F.} and Yu, {X. B.} and Guo, {Z. P.} and Liu, {H. K.} and Z. Wu and J. Ni",

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T1 - Enhanced hydrogen storage performances of NaBH4-MgH2 system

AU - Mao, J. F.

AU - Yu, X. B.

AU - Guo, Z. P.

AU - Liu, H. K.

AU - Wu, Z.

AU - Ni, J.

N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to <a href="mailto:[email protected]">[email protected]</a>.

PY - 2009/6/24

Y1 - 2009/6/24

N2 - The hydrogen storage properties of 2NaBH4 + MgH2 system were studied. It was found that the presence of MgH2 could destabilize the decomposition of NaBH4, decreasing the dehydrogenation temperature about 40 °C compared with the pure NaBH4. It is believed that the formation of MgB2 upon dehydrogenation stabilizes the dehydrogenated state and, thereby, destabilizes the NaBH4. For the desorption the following two-step reaction was observed: 2NaBH4 + MgH2 → 2NaBH4 + Mg + H2 → 2NaH + MgB2 + 4H2. Furthermore, various catalysts such as TiF3, TiO2, Zr, Si and BCC alloy were doped to the NaBH4-MgH2 system. Among these catalysts, TiF3 exhibited the optimum behavior in terms of fast kinetics and lowering the dehydrogenation temperature of the NaBH4-MgH2 system. The rehydrogenation experiments of TiF3-doped NaBH4-MgH2 system were investigated at 600 °C with an initial hydrogen pressure of about 4 MPa. It showed that 5.89 wt.% hydrogen was rehydrogenated within 12 h. XRD results demonstrated the formation of NaBH4 and MgH2 in the rehydrogenated sample. © 2009 Elsevier B.V. All rights reserved.

AB - The hydrogen storage properties of 2NaBH4 + MgH2 system were studied. It was found that the presence of MgH2 could destabilize the decomposition of NaBH4, decreasing the dehydrogenation temperature about 40 °C compared with the pure NaBH4. It is believed that the formation of MgB2 upon dehydrogenation stabilizes the dehydrogenated state and, thereby, destabilizes the NaBH4. For the desorption the following two-step reaction was observed: 2NaBH4 + MgH2 → 2NaBH4 + Mg + H2 → 2NaH + MgB2 + 4H2. Furthermore, various catalysts such as TiF3, TiO2, Zr, Si and BCC alloy were doped to the NaBH4-MgH2 system. Among these catalysts, TiF3 exhibited the optimum behavior in terms of fast kinetics and lowering the dehydrogenation temperature of the NaBH4-MgH2 system. The rehydrogenation experiments of TiF3-doped NaBH4-MgH2 system were investigated at 600 °C with an initial hydrogen pressure of about 4 MPa. It showed that 5.89 wt.% hydrogen was rehydrogenated within 12 h. XRD results demonstrated the formation of NaBH4 and MgH2 in the rehydrogenated sample. © 2009 Elsevier B.V. All rights reserved.

KW - Ball milling

KW - Catalyst doping

KW - Hydrogen storage characteristics

KW - Magnesium hydride

KW - Sodium borohydride

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