Volume 19, Issue 6 2205487
Research Article

Hydrogen Storage in Partially Exfoliated Magnesium Diboride Multilayers

Harini Gunda

Harini Gunda

Sandia National Laboratories, 7011 East Ave, Livermore, CA, 94550 USA

Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat, 382355 India

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Keith G. Ray

Keith G. Ray

Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, CA, 94550 USA

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Leonard E. Klebanoff

Leonard E. Klebanoff

Sandia National Laboratories, 7011 East Ave, Livermore, CA, 94550 USA

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Chaochao Dun

Chaochao Dun

Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA

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Maxwell A. T. Marple

Maxwell A. T. Marple

Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, CA, 94550 USA

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Sichi Li

Sichi Li

Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, CA, 94550 USA

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Peter Sharma

Peter Sharma

Sandia National Laboratories, 1515 Eubank SE, Albuquerque, NM, 87185 USA

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Raymond W. Friddle

Raymond W. Friddle

Sandia National Laboratories, 7011 East Ave, Livermore, CA, 94550 USA

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Joshua D. Sugar

Joshua D. Sugar

Sandia National Laboratories, 7011 East Ave, Livermore, CA, 94550 USA

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Jonathan L. Snider

Jonathan L. Snider

Sandia National Laboratories, 7011 East Ave, Livermore, CA, 94550 USA

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Robert D. Horton

Robert D. Horton

Sandia National Laboratories, 7011 East Ave, Livermore, CA, 94550 USA

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Brendan C. Davis

Brendan C. Davis

Sandia National Laboratories, 7011 East Ave, Livermore, CA, 94550 USA

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Jeffery M. Chames

Jeffery M. Chames

Sandia National Laboratories, 7011 East Ave, Livermore, CA, 94550 USA

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Yi-Sheng Liu

Yi-Sheng Liu

Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA

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Jinghua Guo

Jinghua Guo

Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA

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Harris E. Mason

Harris E. Mason

Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, CA, 94550 USA

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Jeffrey J. Urban

Jeffrey J. Urban

Lawrence Berkeley National Laboratory, Berkeley, CA, 94720 USA

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Brandon C. Wood

Brandon C. Wood

Lawrence Livermore National Laboratory, 7000 East Ave, Livermore, CA, 94550 USA

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Mark D. Allendorf

Mark D. Allendorf

Sandia National Laboratories, 7011 East Ave, Livermore, CA, 94550 USA

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Kabeer Jasuja

Corresponding Author

Kabeer Jasuja

Indian Institute of Technology Gandhinagar, Palaj, Gandhinagar, Gujarat, 382355 India

E-mail: [email protected], [email protected]

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Vitalie Stavila

Corresponding Author

Vitalie Stavila

Sandia National Laboratories, 7011 East Ave, Livermore, CA, 94550 USA

E-mail: [email protected], [email protected]

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First published: 05 December 2022
Citations: 2

Abstract

Metal boride nanostructures have shown significant promise for hydrogen storage applications. However, the synthesis of nanoscale metal boride particles is challenging because of their high surface energy, strong inter- and intraplanar bonding, and difficult-to-control surface termination. Here, it is demonstrated that mechanochemical exfoliation of magnesium diboride in zirconia produces 3–4 nm ultrathin MgB2 nanosheets (multilayers) in high yield. High-pressure hydrogenation of these multilayers at 70 MPa and 330 °C followed by dehydrogenation at 390 °C reveals a hydrogen capacity of 5.1 wt%, which is ≈50 times larger than the capacity of bulk MgB2 under the same conditions. This enhancement is attributed to the creation of defective sites by ball-milling and incomplete Mg surface coverage in MgB2 multilayers, which disrupts the stable boron–boron ring structure. The density functional theory calculations indicate that the balance of Mg on the MgB2 nanosheet surface changes as the material hydrogenates, as it is energetically favorable to trade a small number of Mg vacancies in Mg(BH4)2 for greater Mg coverage on the MgB2 surface. The exfoliation and creation of ultrathin layers is a promising new direction for 2D metal boride/borohydride research with the potential to achieve high-capacity reversible hydrogen storage at more moderate pressures and temperatures.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding authors upon reasonable request.

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