Dehydriding and rehydriding processes of well-crystallized Mg(BH4)2 accompanying with formation of intermediate compounds

H. W. Li; K. Kikuchi; Y. Nakamori; N. Ohba; K. Miwa; S. Towata; S. Orimo

doi:10.1016/j.actamat.2007.11.023

Dehydriding and rehydriding processes of well-crystallized Mg(BH₄)₂ accompanying with formation of intermediate compounds

H. W. Li, K. Kikuchi, Y. Nakamori, N. Ohba, K. Miwa, S. Towata, S. Orimo

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Abstract

Dehydriding and rehydriding properties of well-crystallized Mg(BH₄)₂ were systematically investigated by thermogravimetry (TG) and pressure-composition-temperature (PCT) measurements. The dehydriding reaction of Mg(BH₄)₂ starts at approximately 500 K, and about 14.4 mass% of hydrogen is desorbed according to the following multi-step reaction:Mg(BH₄)₂ → some intermediate compounds → MgH₂ + 2B + 3H₂ → Mg + 2B + 4H₂The apparent enthalpy change in the dehydriding reaction from Mg(BH₄)₂ to MgH₂ is estimated to be 57 ± 5 kJ mol^-1 H₂ based on the result of the PCT measurement. It is proved that approximately 6.1 mass% of hydrogen can be reversibly stored for the sample of Mg(BH₄)₂ after the dehydriding reaction, through the formation of a possible intermediate compound such as MgB₁₂H₁₂.

Original language	English
Pages (from-to)	1342-1347
Number of pages	6
Journal	Acta Materialia
Volume	56
Issue number	6
DOIs	https://doi.org/10.1016/j.actamat.2007.11.023
Publication status	Published - Apr 2008
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2007.11.023

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title = "Dehydriding and rehydriding processes of well-crystallized Mg(BH4)2 accompanying with formation of intermediate compounds",

abstract = "Dehydriding and rehydriding properties of well-crystallized Mg(BH4)2 were systematically investigated by thermogravimetry (TG) and pressure-composition-temperature (PCT) measurements. The dehydriding reaction of Mg(BH4)2 starts at approximately 500 K, and about 14.4 mass% of hydrogen is desorbed according to the following multi-step reaction:Mg(BH4)2 → some intermediate compounds → MgH2 + 2B + 3H2 → Mg + 2B + 4H2The apparent enthalpy change in the dehydriding reaction from Mg(BH4)2 to MgH2 is estimated to be 57 ± 5 kJ mol-1 H2 based on the result of the PCT measurement. It is proved that approximately 6.1 mass% of hydrogen can be reversibly stored for the sample of Mg(BH4)2 after the dehydriding reaction, through the formation of a possible intermediate compound such as MgB12H12.",

author = "Li, {H. W.} and K. Kikuchi and Y. Nakamori and N. Ohba and K. Miwa and S. Towata and S. Orimo",

note = "Funding Information: The authors would like to thank Dr. T. Sato, Mr. M. Aoki and Mr. T. Noritake for their valuable discussions. This study was partially supported by the New Energy and Industrial Technology Development Organization (NEDO), “Development for Safe Utilization and Infrastructure of hydrogen” Project, by the Ministry of Education, Science, Sports and Culture, “Grant-in-Aid for Scientific Research (A), #18206073”. One of the authors (H.L.) is grateful for the JSPS Research Fellowships for Young Scientists.",

year = "2008",

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doi = "10.1016/j.actamat.2007.11.023",

language = "English",

volume = "56",

pages = "1342--1347",

journal = "Acta Materialia",

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T1 - Dehydriding and rehydriding processes of well-crystallized Mg(BH4)2 accompanying with formation of intermediate compounds

AU - Li, H. W.

AU - Kikuchi, K.

AU - Nakamori, Y.

AU - Ohba, N.

AU - Miwa, K.

AU - Towata, S.

AU - Orimo, S.

N1 - Funding Information: The authors would like to thank Dr. T. Sato, Mr. M. Aoki and Mr. T. Noritake for their valuable discussions. This study was partially supported by the New Energy and Industrial Technology Development Organization (NEDO), “Development for Safe Utilization and Infrastructure of hydrogen” Project, by the Ministry of Education, Science, Sports and Culture, “Grant-in-Aid for Scientific Research (A), #18206073”. One of the authors (H.L.) is grateful for the JSPS Research Fellowships for Young Scientists.

PY - 2008/4

Y1 - 2008/4

N2 - Dehydriding and rehydriding properties of well-crystallized Mg(BH4)2 were systematically investigated by thermogravimetry (TG) and pressure-composition-temperature (PCT) measurements. The dehydriding reaction of Mg(BH4)2 starts at approximately 500 K, and about 14.4 mass% of hydrogen is desorbed according to the following multi-step reaction:Mg(BH4)2 → some intermediate compounds → MgH2 + 2B + 3H2 → Mg + 2B + 4H2The apparent enthalpy change in the dehydriding reaction from Mg(BH4)2 to MgH2 is estimated to be 57 ± 5 kJ mol-1 H2 based on the result of the PCT measurement. It is proved that approximately 6.1 mass% of hydrogen can be reversibly stored for the sample of Mg(BH4)2 after the dehydriding reaction, through the formation of a possible intermediate compound such as MgB12H12.

AB - Dehydriding and rehydriding properties of well-crystallized Mg(BH4)2 were systematically investigated by thermogravimetry (TG) and pressure-composition-temperature (PCT) measurements. The dehydriding reaction of Mg(BH4)2 starts at approximately 500 K, and about 14.4 mass% of hydrogen is desorbed according to the following multi-step reaction:Mg(BH4)2 → some intermediate compounds → MgH2 + 2B + 3H2 → Mg + 2B + 4H2The apparent enthalpy change in the dehydriding reaction from Mg(BH4)2 to MgH2 is estimated to be 57 ± 5 kJ mol-1 H2 based on the result of the PCT measurement. It is proved that approximately 6.1 mass% of hydrogen can be reversibly stored for the sample of Mg(BH4)2 after the dehydriding reaction, through the formation of a possible intermediate compound such as MgB12H12.

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Dehydriding and rehydriding processes of well-crystallized Mg(BH₄)₂ accompanying with formation of intermediate compounds

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