Electrochemical hydrogenation
properties of Nd2MgT9 (T = 3d-metals)
multi-phase alloys
Chem.
Met. Alloys 15
(2022) 26-33
https://doi.org/10.30970/cma15.0426
Yuriy
VERBOVYTSKYY, Volodymyr OPRYSK, Yuriy DUBOV, Ihor ZAVALIY
A series of alloys
based on the intermetallic compounds Nd2MgNi9 and Nd2MgCo9
with the compositions Nd2MgT8T’ (T =
Ni, Co, T’ = Fe, Co, Ni, Cu) and Nd2MgNi9-xCox
(x = 0, 3, 4.5, 6, 9) were synthesized and their electrochemical
hydrogenation properties studied. The alloys contained three phases:
pseudo-binary AB2 Laves (SnMgCu4 structure type), AB3
(PuNi3 structure type), and AB5 (CaCu5
structure type) phases. Electrochemical characteristics such as discharge
capacity and capacity retention were studied. The highest capacity (297 mA h/g)
was achieved by the Nd2MgNi9-xCox
(x = 6) alloy and may be related to the chemical and multi-phase
composition.
Discharge capacity vs cycle number for
Nd2MgNi9-xCox (x = 0, 3,
4.5, 6, 9), current density 50 mA/g.
Keywords
X-ray powder diffraction / AB3
alloys / Transition metals / Electrochemical hydrogenation