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The synthesis and hydrogen storage properties of a MgH_2 incorporated carbon aerogel scaffold

Zhang, Shu and Gross, Adam F. and Van Atta, Sky L. and Lopez, Maribel and Liu, Ping and Ahn, Channing C. and Vajo, John J. and Jensen, Craig M. (2009) The synthesis and hydrogen storage properties of a MgH_2 incorporated carbon aerogel scaffold. Nanotechnology, 20 (20). p. 204027. ISSN 0957-4484.

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A new approach to the incorporation of MgH_2 in the nanometer-sized pores of a carbon aerogel scaffold was developed, by infiltrating the aerogel with a solution of dibutylmagnesium (MgBu_2) precursor, and then hydrogenating the incorporated MgBu_2 to MgH_2. The resulting impregnated material showed broad x-ray diffraction peaks of MgH_2. The incorporated MgH_2 was not visible using a transmission electron microscope, which indicated that the incorporated hydride was nanosized and confined in the nanoporous structure of the aerogel. The loading of MgH_2 was determined as 15–17 wt%, of which 75% is reversible over ten cycles. Incorporated MgH_2 had >5 times faster dehydrogenation kinetics than ball-milled activated MgH2, which may be attributed to the particle size of the former being smaller than that of the latter. Cycling tests of the incorporated MgH_2 showed that the dehydrogenation kinetics are unchanged over four cycles. Our results demonstrate that confinement of metal hydride materials in a nanoporous scaffold is an efficient way to avoid aggregation and improve cycling kinetics for hydrogen storage materials.

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Additional Information: © Institute of Physics and IOP Publishing Limited 2009. Received 31 October 2008, in final form 2 February 2009. Published 24 April 2009. Print publication: Issue 20 (20 May 2009). We gratefully acknowledge financial support received from the Office of Hydrogen Fuel Cells and Infrastructure Technology of the US Department of Energy (DOE contract DE-FC36-05GO15067 for AFG, SLV, PL, and JJV).
Funding AgencyGrant Number
Department of Energy (DOE)DE-FC36-05GO15067
Issue or Number:20
Record Number:CaltechAUTHORS:20090821-154805922
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Official Citation:Shu Zhang, Adam F Gross, Sky L Van Atta, Maribel Lopez, Ping Liu, Channing C Ahn, John J Vajo and Craig M Jensen 2009 Nanotechnology 20 204027 (6pp) doi: 10.1088/0957-4484/20/20/204027
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15254
Deposited By: George Porter
Deposited On:10 Sep 2009 15:31
Last Modified:03 Oct 2019 00:56

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