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Unexpected dehydrogenation behaviors of the 2LiBH4-MgH2 composite confined in a mesoporous carbon scaffold

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dc.contributor.author Wang, K
dc.contributor.author Kang, X
dc.contributor.author Zhong, Y
dc.contributor.author Hu, C
dc.contributor.author Ren, Jianwei
dc.contributor.author Wang, P
dc.date.accessioned 2015-03-12T09:57:29Z
dc.date.available 2015-03-12T09:57:29Z
dc.date.issued 2014-11
dc.identifier.citation Wang, K, Kang, X, Zhong, Y, Hu, C, Ren, J and Wang, P. 2014. Unexpected dehydrogenation behaviors of the 2LiBH4-MgH2 composite confined in a mesoporous carbon scaffold. The Journal of Physical Chemistry C, vol. 118(46), pp 26447-26453 en_US
dc.identifier.issn 1932-7447
dc.identifier.uri http://pubs.acs.org/doi/pdf/10.1021/jp505535h
dc.identifier.uri http://hdl.handle.net/10204/7924
dc.description Copyright: 2014 ACS Publishing.Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website. en_US
dc.description.abstract Nanoconfinement has been widely employed as a promising strategy to improve dehydrogenation kinetics, reversibility, and equilibrium pressure of complex metal hydrides. In this paper, we report a careful study of the influence of nanoconfinement on the reversible dehydrogenation property and reaction mechanism pathway of the 2LiBH(sub4)–MgH(sub2) composite system. Compared to the bulk 2LiBH(sub4)–MgH(sub2) composite, the 2LiBH(sub4)–MgH(sub2) confined in the mesoporous carbon (CMK-3) scaffold host exhibits the significantly enhanced dehydrogenation kinetics but meanwhile shows the serious loss of hydrogen capacity upon cycling, particularly in the first two cycles. Moreover, the observed dehydrogenation property is independent of the hydrogen back pressure. The combination analyses of XRD, FTIR, and NMR definitely detected the dominant Mg and B phases in the dehydrogenation products, suggesting the mainly individual desorption of MgH(sub2) and LiBH(sub4) in the confined 2LiBH(sub4)–MgH(sub2) system. This unfavorable change of the dehydrogenation reaction pathway would result in the poor reversibility, which is not expected for the combined hydride systems. These findings might provide renewed insight into the nanoconfinement effect on the hydrogen storage property for multiple phase combined systems. en_US
dc.language.iso en en_US
dc.publisher ACS Publishing en_US
dc.relation.ispartofseries Workflow;14191
dc.subject Nanoconfinement en_US
dc.subject Dehydrogenation en_US
dc.subject Hydrogen storage en_US
dc.title Unexpected dehydrogenation behaviors of the 2LiBH4-MgH2 composite confined in a mesoporous carbon scaffold en_US
dc.type Article en_US
dc.identifier.apacitation Wang, K., Kang, X., Zhong, Y., Hu, C., Ren, J., & Wang, P. (2014). Unexpected dehydrogenation behaviors of the 2LiBH4-MgH2 composite confined in a mesoporous carbon scaffold. http://hdl.handle.net/10204/7924 en_ZA
dc.identifier.chicagocitation Wang, K, X Kang, Y Zhong, C Hu, Jianwei Ren, and P Wang "Unexpected dehydrogenation behaviors of the 2LiBH4-MgH2 composite confined in a mesoporous carbon scaffold." (2014) http://hdl.handle.net/10204/7924 en_ZA
dc.identifier.vancouvercitation Wang K, Kang X, Zhong Y, Hu C, Ren J, Wang P. Unexpected dehydrogenation behaviors of the 2LiBH4-MgH2 composite confined in a mesoporous carbon scaffold. 2014; http://hdl.handle.net/10204/7924. en_ZA
dc.identifier.ris TY - Article AU - Wang, K AU - Kang, X AU - Zhong, Y AU - Hu, C AU - Ren, Jianwei AU - Wang, P AB - Nanoconfinement has been widely employed as a promising strategy to improve dehydrogenation kinetics, reversibility, and equilibrium pressure of complex metal hydrides. In this paper, we report a careful study of the influence of nanoconfinement on the reversible dehydrogenation property and reaction mechanism pathway of the 2LiBH(sub4)–MgH(sub2) composite system. Compared to the bulk 2LiBH(sub4)–MgH(sub2) composite, the 2LiBH(sub4)–MgH(sub2) confined in the mesoporous carbon (CMK-3) scaffold host exhibits the significantly enhanced dehydrogenation kinetics but meanwhile shows the serious loss of hydrogen capacity upon cycling, particularly in the first two cycles. Moreover, the observed dehydrogenation property is independent of the hydrogen back pressure. The combination analyses of XRD, FTIR, and NMR definitely detected the dominant Mg and B phases in the dehydrogenation products, suggesting the mainly individual desorption of MgH(sub2) and LiBH(sub4) in the confined 2LiBH(sub4)–MgH(sub2) system. This unfavorable change of the dehydrogenation reaction pathway would result in the poor reversibility, which is not expected for the combined hydride systems. These findings might provide renewed insight into the nanoconfinement effect on the hydrogen storage property for multiple phase combined systems. DA - 2014-11 DB - ResearchSpace DP - CSIR KW - Nanoconfinement KW - Dehydrogenation KW - Hydrogen storage LK - https://researchspace.csir.co.za PY - 2014 SM - 1932-7447 T1 - Unexpected dehydrogenation behaviors of the 2LiBH4-MgH2 composite confined in a mesoporous carbon scaffold TI - Unexpected dehydrogenation behaviors of the 2LiBH4-MgH2 composite confined in a mesoporous carbon scaffold UR - http://hdl.handle.net/10204/7924 ER - en_ZA


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