Hydrogen storage in rapidly solidified and crystallized Mg-Ni-(Y,La)-Pd alloys
Amorphous-crystalline composite ribbons of quaternary Mg-Ni-(Y,La)-Pd alloys are produced via rapidly solidification and used as precursors for creating nanocrystalline hydrogen storage materials. The resulting materials demonstrate relatively high hydrogen capacity of around 4.5 mass % H and excellent absorption/desorption kinetics at 573 K. Additionally, the alloys demonstrate reversible hydrogen storage at 473 K. A composition of Mg85Ni10Y2.5Pd2.5 fully absorbs and desorbs 4.6 mass % H in 90 min. The cyclability of the quaternary alloys is shows good stability, with little loss in maximum capacity through eight to 10 cycles. This has been attributed to the improved stability of the nanocrystalline structure attained via the Y and La additions. Thermodynamically, the enthalpy of the hydrogen absorption reaction is reduced by 5 kJ/mol in the quaternary alloys, compared to Mg-MgH2; but this is mitigated by a decrease in the entropy of reaction as well.
Hydrogen storage in rapidly solidified and crystallized Mg-Ni-(Y,La)-Pd alloys, International Journal of Hydrogen Energy, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910270
(Accessed June 1, 2023)