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Reversible hydrogen storage at reduced temperatures in the intermetallic compound Mg6(Ni,Pd)

Published

Author(s)

Eric Lass

Abstract

A rapidly-solidified Mg-Ni-Pd alloy is shown to exhibit reversible hydrogen-storage of 5 mass % H near atmospheric pressure at a temperature of 473 K, nearly 100 K below temperatures typically required for Mg-based alloys. Additionally, a single plateau is observed in the pressure-composition isotherm where MgH2 and Mg2NiH4 form and decompose simultaneously during the absorption/desorption process. The increase in absorption plateau pressure to 100 kPa suggests a decrease in the enthalpy of reaction between the hydride and metallic phases by as much as 15 kJ/mol, or 20 %. The decrease arises because of the formation of a new equilibrium metallic phase, Mg6(Ni,Pd). The phase alters the thermodynamics of the hydriding reaction, allowing both MgH2 and Mg2NiH4 to form cooperatively in a single reaction. This method for reducing the enthalpy of the hydriding reaction is promising, and may prove useful in a variety of other metal-hydride hydrogen-storage systems.
Citation
International Journal of Hydrogen Energy

Keywords

Mg-based alloy, hydrogen storage, metal hydride, nanocrystalline material, metallic glass

Citation

Lass, E. (2011), Reversible hydrogen storage at reduced temperatures in the intermetallic compound Mg6(Ni,Pd), International Journal of Hydrogen Energy (Accessed July 19, 2024)

Issues

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Created October 13, 2011, Updated February 19, 2017