Enhancement of hydrogen sorption in magnesium hydride using expanded natural graphite

By A. Chaise, P. Rango, Philippe Marty, D. Fruchart, S. Miraglia, R. Olives, S. Garrier. 2009

241 citations recorded by the source corpus.

Magnesium hydrogenation reaction being exothermic and limited by heat removal, the thermal conductivity of ball-milled magnesium hydride (BM MgH2) powders has to be improved. The compression of BM MgH2 associated to Expanded Natural Graphite (ENG) to form compacted disks has been investigated. Using BM MgH2 without ENG, its compression reduces the porosity and increases its volumetric hydrogen storage capacity. Incorporating ENG before compression drastically improves the thermal conductivity in the direction normal to compression axis. Moreover, the thermal conductivity increases linearly with ENG content, and can be adjusted to fulfill the loading time requirements. The thermodynamic properties and intrinsic sorption kinetics remain unchanged. However, both compression and ENG incorporation reduce the hydrogen permeability, especially in the direction parallel to the compression axis, which imposes a limit to the disk thickness. A small-size instrumented tank has been loaded with either pure BM MgH2 powder or with disks having different ENG contents. The results obtained for both cases are compared.

Subfields: Aerospace Engineering, Biomaterials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/6b33bc47fbecc4aa6005aba9b2f14cbdfc7483b8

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In Aerospace Engineering

1. Jun Ni
2. M. Felderhoff

In Biomaterials

1. C. J. Webb
2. M. Dornheim

In Materials Chemistry

1. T. Jensen
2. Ping Chen
3. M. Lototskyy
4. V. Yartys
5. Y. Kojima
6. E. Akiba
7. M. Hirscher
8. Dorthe B. Ravnsbæk

Citations in the corpus

• Complex metal hydrides for hydrogen, thermal and electrochemical energy storage (2017, background): “However, in practical applications CMHs are typically used in the form of dense compacts and research on these has shown that they only undergo a mild temperature increase on exposure to air, and that direct immersion in water results in a mild temperature increase combined with slow release of H2 [”
• Application of hydrides in hydrogen storage and compression: Achievements, outlook and perspectives (2019, unknown): “One possible solution, which was proven successful more than once [5, 6], is compacting the hydride powder into high-density pellets.”
• Materials for hydrogen-based energy storage – past, recent progress and future outlook (2019, background): “ndard configuration [398]) is a composite containing MgH 2 powder ball-milled with 4 at% of Ti– V–Cr alloy and further compacted with ~5 wt% of expanded natural graphite (ENG) at a pressure ~ 200 MPa [399]. Apart from an increase in the filling density of the MH material in the containment resulting”
• MOF-5 composites exhibiting improved thermal conductivity (2012, methodology): “[31] Chaise A, de Rango P, Marty P, Fruchart D, Miraglia S, Olivès R, et al.”