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Volume 151, 2011
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The role of Ni in increasing the reversibility of the hydrogen release from nanoconfined LiBH4

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Abstract

Nanoconfinement and the use of catalysts are promising strategies to enhance the reversibility of hydrogen storage in light metal hydrides. We combined nanoconfinement of LiBH4 in nanoporous carbon with the addition of Ni. Samples were prepared by deposition of 5–6 nm Ni nanoparticles inside the porous carbon, followed by melt infiltration with LiBH4. The Ni addition has only a slight influence on the LiBH4 hydrogen desorption, but significantly enhances the subsequent uptake of hydrogen under mild conditions. Reversible, but limited, intercalation of Li is observed during hydrogen cycling. X-ray diffraction shows that the initial crystalline 5–6 nm Ni nanoparticles are not present anymore after melt infiltration with LiBH4. However, transmission electron microscopy showed Ni-containing nanoparticles in the samples. Extended X-ray absorption fine structure spectroscopy proved the presence of NixB phases with the Ni–B coordination numbers changing reversibly with dehydrogenation and rehydrogenation of the sample. NixB can act as a hydrogenation catalyst, but solid-state 11B NMR proved that the addition of Ni also enhanced the reversibility of the system by influencing the microstructure of the nanoconfined LiBH4 upon cycling.

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Publication details

The article was received on 17 Dec 2010, accepted on 17 Jan 2011 and first published on 09 May 2011


Article type: Paper
DOI: 10.1039/C0FD00028K
Citation: Faraday Discuss., 2011,151, 47-58

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    The role of Ni in increasing the reversibility of the hydrogen release from nanoconfined LiBH4

    P. Ngene, M. H. W. Verkuijlen, Q. Zheng, J. Kragten, P. J. M. van Bentum, J. H. Bitter and P. E. de Jongh, Faraday Discuss., 2011, 151, 47
    DOI: 10.1039/C0FD00028K

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