Improved hydrogen storage properties of MgH2 catalyzed with K2NiF6

doi:10.1016/j.jechem.2016.04.015

能源化学(英文) ›› 2016, Vol. 25 ›› Issue (5): 832-839.DOI: 10.1016/j.jechem.2016.04.015

Improved hydrogen storage properties of MgH₂ catalyzed with K₂NiF₆

N. N. Sulaiman, N. Juahir, N. S. Mustafa, F. A. Halim Yap, M. Ismail

School of Ocean Engineering, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Malaysia

收稿日期:2016-02-03 修回日期:2016-03-28 出版日期:2016-09-15 发布日期:2016-09-30
通讯作者: M. Ismail
基金资助:
This work was supported by Ministry of Higher Education Malaysia Fundamental Research Grant Scheme (FRGS 59362).

Improved hydrogen storage properties of MgH₂ catalyzed with K₂NiF₆

N. N. Sulaiman, N. Juahir, N. S. Mustafa, F. A. Halim Yap, M. Ismail

School of Ocean Engineering, Universiti Malaysia Terengganu, 21030 Kuala Terengganu, Malaysia

Received:2016-02-03 Revised:2016-03-28 Online:2016-09-15 Published:2016-09-30
Contact: M. Ismail
Supported by:
This work was supported by Ministry of Higher Education Malaysia Fundamental Research Grant Scheme (FRGS 59362).

摘要/Abstract

摘要： In this study, the hydrogen storage properties of MgH₂-X wt% K₂NiF₆ (X = 5, 10, 15, 20, and 50) were investigated for the first time. From the analysis of the onset desorption temperature and isothermal de/absorption kinetics, it was shown that MgH₂+5 wt% K₂NiF₆ sample has the best performance. The 5 wt% doped sample started to release hydrogen at about 260 ℃, which was a reduction of about 95 ℃ and 157 oC compared with the as-milled and as-received MgH₂. In addition, the de/absorption kinetics of the MgH₂+5 wt% K₂NiF₆ were also improved significantly compared to the un-doped MgH₂. The apparent activation energy for hydrogen desorption exhibited the decrement from 167.0 kJ/mol for as-milled MgH₂ to 111.0 kJ/mol with the addition of 5 wt% K₂NiF₆. Moreover, the X-ray diffraction spectra displayed the formation of new phases of KF, KH, Mg₂Ni and Mg₂NiH₄ by doping the K₂NiF₆ with MgH₂ after the dehydrogenation and rehydrogenation processes. The scanning electron microscope results revealed that MgH₂doped with 5 wt% K₂NiF₆ demonstrated the smallest particle size compared to the as-received and as-milled MgH₂. It is believed that the formation of in situ active species of KF, KH, and Mg₂Ni could provide a synergetic catalytic effect in enhancing the hydrogen sorption properties of MgH₂.

关键词: Hydrogen storage, Solid state storage, Magnesium hydride, Catalyst

Abstract: In this study, the hydrogen storage properties of MgH₂-X wt% K₂NiF₆ (X = 5, 10, 15, 20, and 50) were investigated for the first time. From the analysis of the onset desorption temperature and isothermal de/absorption kinetics, it was shown that MgH₂+5 wt% K₂NiF₆ sample has the best performance. The 5 wt% doped sample started to release hydrogen at about 260 ℃, which was a reduction of about 95 ℃ and 157 oC compared with the as-milled and as-received MgH₂. In addition, the de/absorption kinetics of the MgH₂+5 wt% K₂NiF₆ were also improved significantly compared to the un-doped MgH₂. The apparent activation energy for hydrogen desorption exhibited the decrement from 167.0 kJ/mol for as-milled MgH₂ to 111.0 kJ/mol with the addition of 5 wt% K₂NiF₆. Moreover, the X-ray diffraction spectra displayed the formation of new phases of KF, KH, Mg₂Ni and Mg₂NiH₄ by doping the K₂NiF₆ with MgH₂ after the dehydrogenation and rehydrogenation processes. The scanning electron microscope results revealed that MgH₂doped with 5 wt% K₂NiF₆ demonstrated the smallest particle size compared to the as-received and as-milled MgH₂. It is believed that the formation of in situ active species of KF, KH, and Mg₂Ni could provide a synergetic catalytic effect in enhancing the hydrogen sorption properties of MgH₂.

Key words: Hydrogen storage, Solid state storage, Magnesium hydride, Catalyst

N. N. Sulaiman, N. Juahir, N. S. Mustafa, F. A. Halim Yap, M. Ismail. Improved hydrogen storage properties of MgH₂ catalyzed with K₂NiF₆[J]. 能源化学(英文), 2016, 25(5): 832-839.

N. N. Sulaiman, N. Juahir, N. S. Mustafa, F. A. Halim Yap, M. Ismail. Improved hydrogen storage properties of MgH₂ catalyzed with K₂NiF₆[J]. Journal of Energy Chemistry, 2016, 25(5): 832-839.

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Improved hydrogen storage properties of MgH₂ catalyzed with K₂NiF₆

Improved hydrogen storage properties of MgH₂ catalyzed with K₂NiF₆

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