Comparative study on the reversibility of pure metal borohydrides

Hai Wen Li; Etsuo Akiba; Shin Ichi Orimo

doi:10.1016/j.jallcom.2013.03.264

Comparative study on the reversibility of pure metal borohydrides

Hai Wen Li, Etsuo Akiba, Shin Ichi Orimo

Kyushu University

Research output: Contribution to journal › Article › peer-review

25 Citations (Scopus)

Abstract

Improvement of the reversibility of metal borohydrides is a key issue for hydrogen storage applications. In this study, we carefully investigated the first rehydrogenation of pure Mg(BH₄)₂ and Ca(BH ₄)₂ under a hydrogen pressure of 40.0 MPa. Mg(BH ₄)₂ is produced even at a relatively low temperature of 473 K, and its amount increases with the temperature up to 673 K, leading to the increased rehydrogenation content and a maximum (7.6 mass%, equivalent to 51% of Mg(BH₄)₂) at 673 K. Under the same condition, more than 90% of rehydrogenation is confirmed through the formation of α-Ca(BH ₄)₂ as clearly observed by XRD and NMR measurements. Comparison of the rehydrogenation properties of Mg(BH₄)₂ and Ca(BH₄)₂ suggests that control of dehydrogenation products would be an important approach to improve the reversibility of metal borohydrides.

Original language	English
Pages (from-to)	S292-S295
Journal	Journal of Alloys and Compounds
Volume	580
Issue number	SUPPL1
DOIs	https://doi.org/10.1016/j.jallcom.2013.03.264
Publication status	Published - 2013

Keywords

Borohydride
Hydride
Hydrogen
Hydrogen storage
Reversibility

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10.1016/j.jallcom.2013.03.264

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title = "Comparative study on the reversibility of pure metal borohydrides",

abstract = "Improvement of the reversibility of metal borohydrides is a key issue for hydrogen storage applications. In this study, we carefully investigated the first rehydrogenation of pure Mg(BH4)2 and Ca(BH 4)2 under a hydrogen pressure of 40.0 MPa. Mg(BH 4)2 is produced even at a relatively low temperature of 473 K, and its amount increases with the temperature up to 673 K, leading to the increased rehydrogenation content and a maximum (7.6 mass%, equivalent to 51% of Mg(BH4)2) at 673 K. Under the same condition, more than 90% of rehydrogenation is confirmed through the formation of α-Ca(BH 4)2 as clearly observed by XRD and NMR measurements. Comparison of the rehydrogenation properties of Mg(BH4)2 and Ca(BH4)2 suggests that control of dehydrogenation products would be an important approach to improve the reversibility of metal borohydrides.",

keywords = "Borohydride, Hydride, Hydrogen, Hydrogen storage, Reversibility",

author = "Li, {Hai Wen} and Etsuo Akiba and Orimo, {Shin Ichi}",

note = "Funding Information: The authors would like to thank Drs. S. Towata, K. Miwa, M. Aoki, M. Matsumoto, and T. Noritake for their valuable discussions. This study was partially supported by NEDO, {\textquoteleft} Development for Hydrogen Production, Transportation and Storage System {\textquoteright} Project, JSPS KAKENHI (23760658) and The International Institute for Carbon Neutral Energy Research (WPI-I2CNER), sponsored by the Japanese Ministry of Education, Culture, Sports, Science and Technology.",

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doi = "10.1016/j.jallcom.2013.03.264",

language = "English",

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AU - Li, Hai Wen

AU - Akiba, Etsuo

AU - Orimo, Shin Ichi

N1 - Funding Information: The authors would like to thank Drs. S. Towata, K. Miwa, M. Aoki, M. Matsumoto, and T. Noritake for their valuable discussions. This study was partially supported by NEDO, ‘ Development for Hydrogen Production, Transportation and Storage System ’ Project, JSPS KAKENHI (23760658) and The International Institute for Carbon Neutral Energy Research (WPI-I2CNER), sponsored by the Japanese Ministry of Education, Culture, Sports, Science and Technology.

PY - 2013

Y1 - 2013

N2 - Improvement of the reversibility of metal borohydrides is a key issue for hydrogen storage applications. In this study, we carefully investigated the first rehydrogenation of pure Mg(BH4)2 and Ca(BH 4)2 under a hydrogen pressure of 40.0 MPa. Mg(BH 4)2 is produced even at a relatively low temperature of 473 K, and its amount increases with the temperature up to 673 K, leading to the increased rehydrogenation content and a maximum (7.6 mass%, equivalent to 51% of Mg(BH4)2) at 673 K. Under the same condition, more than 90% of rehydrogenation is confirmed through the formation of α-Ca(BH 4)2 as clearly observed by XRD and NMR measurements. Comparison of the rehydrogenation properties of Mg(BH4)2 and Ca(BH4)2 suggests that control of dehydrogenation products would be an important approach to improve the reversibility of metal borohydrides.

AB - Improvement of the reversibility of metal borohydrides is a key issue for hydrogen storage applications. In this study, we carefully investigated the first rehydrogenation of pure Mg(BH4)2 and Ca(BH 4)2 under a hydrogen pressure of 40.0 MPa. Mg(BH 4)2 is produced even at a relatively low temperature of 473 K, and its amount increases with the temperature up to 673 K, leading to the increased rehydrogenation content and a maximum (7.6 mass%, equivalent to 51% of Mg(BH4)2) at 673 K. Under the same condition, more than 90% of rehydrogenation is confirmed through the formation of α-Ca(BH 4)2 as clearly observed by XRD and NMR measurements. Comparison of the rehydrogenation properties of Mg(BH4)2 and Ca(BH4)2 suggests that control of dehydrogenation products would be an important approach to improve the reversibility of metal borohydrides.

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KW - Hydrogen storage

KW - Reversibility

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Comparative study on the reversibility of pure metal borohydrides

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