TY - JOUR
T1 - Tailoring dehydrogenation in lithium borohydride – magnesium nickel hydride hydrogen storage systems with metal halide additives
AU - Dansirima, Palmarin
AU - Grinderslev, Jakob B.
AU - Kristensen, Lasse G.
AU - Utke, Rapee
AU - Jensen, Torben R.
N1 - Publisher Copyright:
© 2024 The Authors
PY - 2025/1/13
Y1 - 2025/1/13
N2 - Solid state hydrogen storage may have a strong impact on future storage of renewable energy. Here we explore possible synergy effect in multi-component systems based on the lithium borohydride magnesium nickel hydride reactive hydride composite (LiBH4–Mg2NiH4). The composites of LiBH4–Mg2NiH4 are prepared by ball milling of LiBH4 with Mg2NiH4–MgNi2 or Mg2NiH4–MgH2–Ni. Thermal analysis reveals that LiBH4–Mg2NiH4–MgNi2 provides 20 °C lower onset dehydrogenation temperature compared to Mg2NiH4–MgH2–Ni. The Powder X-ray diffraction analysis of dehydrogenated samples indicates the similar dehydrogenation mechanisms producing the reversible phase MgNi2.5B2, with a hydrogen storage capacity of 3.6 wt% at T = 400 °C under 5 bar of hydrogen back pressure. The addition of transition metal halide additives (MnF2, NbF5, TiF3, ZnF2, and TiCl3) further reduces dehydrogenation temperatures from 308 °C to 260–266 °C (ΔT = 42–48 °C and initiates the dehydrogenation process by destabilizing LiBH4. Among all additives, ZnF2 shows the best performance offering an improved hydrogen capacity (3.76 wt%), lower dehydrogenation temperature, and suppression of diborane gas formation.
AB - Solid state hydrogen storage may have a strong impact on future storage of renewable energy. Here we explore possible synergy effect in multi-component systems based on the lithium borohydride magnesium nickel hydride reactive hydride composite (LiBH4–Mg2NiH4). The composites of LiBH4–Mg2NiH4 are prepared by ball milling of LiBH4 with Mg2NiH4–MgNi2 or Mg2NiH4–MgH2–Ni. Thermal analysis reveals that LiBH4–Mg2NiH4–MgNi2 provides 20 °C lower onset dehydrogenation temperature compared to Mg2NiH4–MgH2–Ni. The Powder X-ray diffraction analysis of dehydrogenated samples indicates the similar dehydrogenation mechanisms producing the reversible phase MgNi2.5B2, with a hydrogen storage capacity of 3.6 wt% at T = 400 °C under 5 bar of hydrogen back pressure. The addition of transition metal halide additives (MnF2, NbF5, TiF3, ZnF2, and TiCl3) further reduces dehydrogenation temperatures from 308 °C to 260–266 °C (ΔT = 42–48 °C and initiates the dehydrogenation process by destabilizing LiBH4. Among all additives, ZnF2 shows the best performance offering an improved hydrogen capacity (3.76 wt%), lower dehydrogenation temperature, and suppression of diborane gas formation.
KW - Borohydrides
KW - Catalysis
KW - Hydrogen storage
KW - Metal hydrides
KW - Reactive hydride composite
UR - http://www.scopus.com/inward/record.url?scp=85211741242&partnerID=8YFLogxK
U2 - 10.1016/j.ijhydene.2024.12.124
DO - 10.1016/j.ijhydene.2024.12.124
M3 - Journal article
AN - SCOPUS:85211741242
SN - 0360-3199
VL - 98
SP - 908
EP - 914
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
ER -