TY - JOUR
T1 - High-temperature high-pressure reactive ball milling synthesis of Mg-Ni-based solid-state hydrogen storage materials
AU - Baran, Agata
AU - Jensen, Torben R.
AU - Polański, Marek
N1 - Publisher Copyright:
© 2024 The Authors
PY - 2024/12/1
Y1 - 2024/12/1
N2 - High-temperature, high-pressure reactive ball milling (HTHPRBM) may become a revolutionary technique in mechanochemical synthesis since it allows mechanochemical processes to be conducted under both elevated temperature and pressure with constant control of the conditions. This study explores the possibility of the application of this novel method in the synthesis of solid-state hydrogen storage materials from Mg[sbnd]Ni system. The 2 Mg:Ni molar ratio mixture was processed in a planetary ball mill under hydrogen pressure and temperatures up to 325 °C, indicating that the temperature significantly affects reaction kinetics. The application of high temperatures enabled the reaction to be completed in approximately 40 min, even at the low rotational speed (250 rpm) of the mill. However, despite predictions, especially at lower temperatures, the process unfortunately favoured the formation of magnesium hydride instead of the ternary Mg2NiH4 hydride. Increasing the milling temperature only caused the magnesium particles to decrease in size and undergo hydrogenation, whereas the nickel particles underwent cold welding and agglomeration. Hence, nickel particles act only as catalysts, improving MgH2 formation instead of producing satisfactory amounts of magnesium‑nickel hydride. The magnesium nickel hydride Mg2NiH4 was present only in samples synthesised above 250 °C.
AB - High-temperature, high-pressure reactive ball milling (HTHPRBM) may become a revolutionary technique in mechanochemical synthesis since it allows mechanochemical processes to be conducted under both elevated temperature and pressure with constant control of the conditions. This study explores the possibility of the application of this novel method in the synthesis of solid-state hydrogen storage materials from Mg[sbnd]Ni system. The 2 Mg:Ni molar ratio mixture was processed in a planetary ball mill under hydrogen pressure and temperatures up to 325 °C, indicating that the temperature significantly affects reaction kinetics. The application of high temperatures enabled the reaction to be completed in approximately 40 min, even at the low rotational speed (250 rpm) of the mill. However, despite predictions, especially at lower temperatures, the process unfortunately favoured the formation of magnesium hydride instead of the ternary Mg2NiH4 hydride. Increasing the milling temperature only caused the magnesium particles to decrease in size and undergo hydrogenation, whereas the nickel particles underwent cold welding and agglomeration. Hence, nickel particles act only as catalysts, improving MgH2 formation instead of producing satisfactory amounts of magnesium‑nickel hydride. The magnesium nickel hydride Mg2NiH4 was present only in samples synthesised above 250 °C.
KW - High pressure
KW - High temperature
KW - Magnesium hydride
KW - Magnesium nickel hydride
KW - Reactive ball milling
KW - Solid-state hydrogen storage
UR - http://www.scopus.com/inward/record.url?scp=85207038707&partnerID=8YFLogxK
U2 - 10.1016/j.est.2024.114271
DO - 10.1016/j.est.2024.114271
M3 - Journal article
AN - SCOPUS:85207038707
SN - 2352-152X
VL - 103
JO - Journal of Energy Storage
JF - Journal of Energy Storage
IS - A
M1 - 114271
ER -