Enhanced hydrogen storage performance of LiAlH4-MgH 2-TiF3 composite

Jianfeng Mao; Zaiping Guo; Xuebin Yu; Mohammad Ismail; Huakun Liu

doi:10.1016/j.ijhydene.2011.02.001

Enhanced hydrogen storage performance of LiAlH₄-MgH ₂-TiF₃ composite

Jianfeng Mao, Zaiping Guo, Xuebin Yu, Mohammad Ismail, Huakun Liu

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

64 Citations (Scopus)

Abstract

The mutual destabilization of LiAlH₄ and MgH₂ in the reactive hydride composite LiAlH₄-MgH₂ is attributed to the formation of intermediate compounds, including Li-Mg and Mg-Al alloys, upon dehydrogenation. TiF₃ was doped into the composite for promoting this interaction and thus enhancing the hydrogen sorption properties. Experimental analysis on the LiAlH₄-MgH₂-TiF₃ composite was performed via temperature-programmed desorption (TPD), differential scanning calorimetry (DSC), isothermal sorption, pressure-composition isotherms (PCI), and powder X-ray diffraction (XRD). For LiAlH₄-MgH ₂-TiF₃ composite (mole ratio 1:1:0.05), the dehydrogenation temperature range starts from about 60 °C, which is 100 °C lower than for LiAlH₄-MgH₂. At 300 °C, the LiAlH₄-MgH₂-TiF₃ composite can desorb 2.48 wt% hydrogen in 10 min during its second stage dehydrogenation, corresponding to the decomposition of MgH₂. In contrast, 20 min was required for the LiAlH₄-MgH₂ sample to release so much hydrogen capacity under the same conditions. The hydrogen absorption properties of the LiAlH ₄-MgH₂-TiF₃ composite were also improved significantly as compared to the LiAlH₄-MgH₂ composite. A hydrogen absorption capacity of 2.68 wt% under 300 °C and 20 atm H ₂ pressure was reached after 5 min in the LiAlH₄-MgH ₂-TiF₃ composite, which is larger than that of LiAlH ₄-MgH₂ (1.75 wt%). XRD results show that the MgH ₂ and LiH were reformed after rehydrogenation. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	5369-5374
Journal	International Journal of Hydrogen Energy
Volume	36
Issue number	9
DOIs	https://doi.org/10.1016/j.ijhydene.2011.02.001
Publication status	Published - May 2011
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

The authors are grateful for financial support from the Australian Research Council (ARC) through a Discovery project (DP0878661), the Shanghai Leading Academic Discipline Project (B113), and the National Natural Science Foundation of China (Grant No. 51071047 ).

Research Keywords

Catalyst
Hydrogen storage
LiAlH4
MgH2
TiF3

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title = "Enhanced hydrogen storage performance of LiAlH4-MgH 2-TiF3 composite",

abstract = "The mutual destabilization of LiAlH4 and MgH2 in the reactive hydride composite LiAlH4-MgH2 is attributed to the formation of intermediate compounds, including Li-Mg and Mg-Al alloys, upon dehydrogenation. TiF3 was doped into the composite for promoting this interaction and thus enhancing the hydrogen sorption properties. Experimental analysis on the LiAlH4-MgH2-TiF3 composite was performed via temperature-programmed desorption (TPD), differential scanning calorimetry (DSC), isothermal sorption, pressure-composition isotherms (PCI), and powder X-ray diffraction (XRD). For LiAlH4-MgH 2-TiF3 composite (mole ratio 1:1:0.05), the dehydrogenation temperature range starts from about 60 °C, which is 100 °C lower than for LiAlH4-MgH2. At 300 °C, the LiAlH4-MgH2-TiF3 composite can desorb 2.48 wt% hydrogen in 10 min during its second stage dehydrogenation, corresponding to the decomposition of MgH2. In contrast, 20 min was required for the LiAlH4-MgH2 sample to release so much hydrogen capacity under the same conditions. The hydrogen absorption properties of the LiAlH 4-MgH2-TiF3 composite were also improved significantly as compared to the LiAlH4-MgH2 composite. A hydrogen absorption capacity of 2.68 wt% under 300 °C and 20 atm H 2 pressure was reached after 5 min in the LiAlH4-MgH 2-TiF3 composite, which is larger than that of LiAlH 4-MgH2 (1.75 wt%). XRD results show that the MgH 2 and LiH were reformed after rehydrogenation. {\textcopyright} 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.",

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AU - Guo, Zaiping

AU - Yu, Xuebin

AU - Ismail, Mohammad

AU - Liu, Huakun

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>.

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N2 - The mutual destabilization of LiAlH4 and MgH2 in the reactive hydride composite LiAlH4-MgH2 is attributed to the formation of intermediate compounds, including Li-Mg and Mg-Al alloys, upon dehydrogenation. TiF3 was doped into the composite for promoting this interaction and thus enhancing the hydrogen sorption properties. Experimental analysis on the LiAlH4-MgH2-TiF3 composite was performed via temperature-programmed desorption (TPD), differential scanning calorimetry (DSC), isothermal sorption, pressure-composition isotherms (PCI), and powder X-ray diffraction (XRD). For LiAlH4-MgH 2-TiF3 composite (mole ratio 1:1:0.05), the dehydrogenation temperature range starts from about 60 °C, which is 100 °C lower than for LiAlH4-MgH2. At 300 °C, the LiAlH4-MgH2-TiF3 composite can desorb 2.48 wt% hydrogen in 10 min during its second stage dehydrogenation, corresponding to the decomposition of MgH2. In contrast, 20 min was required for the LiAlH4-MgH2 sample to release so much hydrogen capacity under the same conditions. The hydrogen absorption properties of the LiAlH 4-MgH2-TiF3 composite were also improved significantly as compared to the LiAlH4-MgH2 composite. A hydrogen absorption capacity of 2.68 wt% under 300 °C and 20 atm H 2 pressure was reached after 5 min in the LiAlH4-MgH 2-TiF3 composite, which is larger than that of LiAlH 4-MgH2 (1.75 wt%). XRD results show that the MgH 2 and LiH were reformed after rehydrogenation. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

AB - The mutual destabilization of LiAlH4 and MgH2 in the reactive hydride composite LiAlH4-MgH2 is attributed to the formation of intermediate compounds, including Li-Mg and Mg-Al alloys, upon dehydrogenation. TiF3 was doped into the composite for promoting this interaction and thus enhancing the hydrogen sorption properties. Experimental analysis on the LiAlH4-MgH2-TiF3 composite was performed via temperature-programmed desorption (TPD), differential scanning calorimetry (DSC), isothermal sorption, pressure-composition isotherms (PCI), and powder X-ray diffraction (XRD). For LiAlH4-MgH 2-TiF3 composite (mole ratio 1:1:0.05), the dehydrogenation temperature range starts from about 60 °C, which is 100 °C lower than for LiAlH4-MgH2. At 300 °C, the LiAlH4-MgH2-TiF3 composite can desorb 2.48 wt% hydrogen in 10 min during its second stage dehydrogenation, corresponding to the decomposition of MgH2. In contrast, 20 min was required for the LiAlH4-MgH2 sample to release so much hydrogen capacity under the same conditions. The hydrogen absorption properties of the LiAlH 4-MgH2-TiF3 composite were also improved significantly as compared to the LiAlH4-MgH2 composite. A hydrogen absorption capacity of 2.68 wt% under 300 °C and 20 atm H 2 pressure was reached after 5 min in the LiAlH4-MgH 2-TiF3 composite, which is larger than that of LiAlH 4-MgH2 (1.75 wt%). XRD results show that the MgH 2 and LiH were reformed after rehydrogenation. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

KW - Catalyst

KW - Hydrogen storage

KW - LiAlH4

KW - MgH2

KW - TiF3

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VL - 36

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EP - 5374

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

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