Electrochemical hydrogenation properties of Nd2MgT9 (T = 3d-metals) multi-phase alloys

Abstract

A series of alloys based on the intermetallic compounds Nd 2 MgNi 9 and Nd 2 MgCo 9 with the compositions Nd 2 MgT 8 T' (T = Ni, Co, T' = Fe, Co, Ni, Cu) and Nd 2 MgNi 9-x Co x (x = 0, 3, 4.5, 6, 9) were synthesized and their electrochemical hydrogenation properties studied. The alloys contained three phases: pseudo-binary AB 2 Laves (SnMgCu 4 structure type), AB 3 (PuNi 3 structure type), and AB 5 (CaCu 5 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 Nd 2 MgNi 9-x Co x (x = 6) alloy and may be related to the chemical and multi-phase composition. X-ray powder diffraction / AB 3 alloys / Transition metals / Electrochemical hydrogenation