Electrochemical Behaviour of Some Mechanically Alloyed Mg — Ni-Based Amorphous Hydrogen Storage Alloys*

Electrochemical properties of Mg-based hydrogen storage alloys prepared by hydriding combustion synthesis and subsequent mechanical milling (HCS+MM)

“…It is well known that the crystalline Mg 2 Ni produced by melting cannot be used as hydrogen storage electrode alloy because it does not have electrochemical hydrogen storage capacity. But Lei et al [1] developed a kind of Mg-Ni-based amorphous hydrogen storage electrode alloys produced by MA, which had large reversible electrochemical hydrogen storage capacity at room temperature. From XRD analysis, we have known that the HCS product was mainly composed of Mg 2 NiH 4 phase and Mg 2 NiH 0.3 phase.…”

“…Mechanical alloying (MA) or mechanical milling (MM) has been used to synthesize amorphous or nanocrystalline magnesium-based alloys which have higher electrochemical capacity than crystalline alloys [1][2][3][4][5]. However, it usually takes a long time and the sample is easily contaminated during the milling process.…”

Microstructure and hydrogen sorption properties of Mg–Ni/MmM multi-layer film by magnetron sputtering

“…Previous researches have demonstrated that the nanocrystalline Mg 2 Ni and Mg fabricated by mechanical alloying exhibited better kinetic performances than usual polycrystalline phases, where their hydrogen absorption and desorption temperatures were decreased [1,4,15]. The same mechanism could also be applied to the nanocrystalline Mg 2:9 Ni layer.…”

“…Current researches mainly focus on two aspects: one is to improve the poor hydrogen absorption/desorption kinetic performances and decrease the working temperature [1][2][3][4][5]; the other is to improve the electrochemical properties as negative material of Ni-MH battery [6][7][8], such as the discharge capacity and cyclic life. So far, the methods used to improve the performances of Mg-base alloys can be summarized as follows: element substitution [9,10], surface modiÿcation [11,12], the addition of catalytic components [13,14], formation of amorphous or nanocrystalline structure [1][2][3]15,16] and synthesis of composite by ball-milling magnesium with other hydrogen storage materials [2,17,18].…”

The effects of Pd and/or Zr additives on the structures and cyclic stabilities of Mg50Ni50-based electrode alloys

“…The properties of large capacity [3], light weight, and low cost recommend Mg 50 Ni 50 amorphous hydrogen storage alloys as a promising candidate for the anode material of Ni-MH batteries. However, due to their poor anti-corrosion ability in KOH electrolyte, the low cyclic discharge stability of Mg 50 Ni 50 alloy hampers their commercial utilization [4].…”