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Issue 2, 2013
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Stabilization of NaZn(BH4)3via nanoconfinement in SBA-15 towards enhanced hydrogen release

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Abstract

In the present work, the decomposition behaviour of NaZn(BH4)3 nanoconfined in mesoporous SBA-15 has been investigated in detail and compared to bulk NaZn(BH4)3 that was ball milled with SBA-15, but not nanoconfined. The successful incorporation of nanoconfined NaZn(BH4)3 into mesopores of SBA-15 was confirmed by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, 11B nuclear magnetic resonance, nitrogen absorption/desorption isotherms, and Fourier transform infrared spectroscopy measurements. It is demonstrated that the dehydrogenation of the space-confined NaZn(BH4)3 is free of emission of boric by-products, and significantly improved hydrogen release kinetics is also achieved, with pure hydrogen release at temperatures ranging from 50 to 150 °C. By the Arrhenius method, the activation energy for the modified NaZn(BH4)3 was calculated to be only 38.9 kJ mol−1, a reduction of 5.3 kJ mol−1 compared to that of bulk NaZn(BH4)3. This work indicates that nanoconfinement within a mesoporous scaffold is a promising approach towards stabilizing unstable metal borohydrides to achieve hydrogen release with high purity.

Graphical abstract: Stabilization of NaZn(BH4)3via nanoconfinement in SBA-15 towards enhanced hydrogen release

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Publication details

The article was received on 05 Sep 2012, accepted on 26 Sep 2012 and first published on 27 Sep 2012


Article type: Paper
DOI: 10.1039/C2TA00195K
J. Mater. Chem. A, 2013,1, 250-257

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    Stabilization of NaZn(BH4)3via nanoconfinement in SBA-15 towards enhanced hydrogen release

    G. Xia, L. Li, Z. Guo, Q. Gu, Y. Guo, X. Yu, H. Liu and Z. Liu, J. Mater. Chem. A, 2013, 1, 250
    DOI: 10.1039/C2TA00195K

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