TY - JOUR
T1 - Comparative study on the reversibility of pure metal borohydrides
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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U2 - 10.1016/j.jallcom.2013.03.264
DO - 10.1016/j.jallcom.2013.03.264
M3 - Article
AN - SCOPUS:84886594426
VL - 580
SP - S292-S295
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
IS - SUPPL1
ER -