A thermal analysis investigation of the hydriding properties of nanocrystalline Mg–Ni based alloys prepared by high energy ball milling

Superior Hydrogen Absorption–Desorption Cycle Durability of Ball‐Milled 82MgH2‐3PrH2‐15Al Composite

“…On the other hand, surface oxidation of Mg‐based materials is also demonstrated to be a factor to degrade cycle durability because of surface passivation and mass loss of active hydrogen storage substances . Thus the formation of specific modifying agents on powder surfaces and crystallite boundaries of Mg is an effective strategy to enhance cycle durability .…”

Preparation and electrochemical properties of MgNi–MB (M=Co, Ti) composite alloys

“…9, for the XRD pattern of the electrode after 30 charge-discharge cycles, besides the 3 strongest Ni peaks, the several main weak peaks can be indexed to ␤-Co(OH) 2 (PCPDFWIN 30-0443). This result is quite different with that of pure MgNi alloy which suggests that Mg(OH) 2 and Ni(OH) 2 should be the main products after more than four charge-discharge cycles [30]. In a recent work [32], amorphous CoB was prepared by chemical method and investigated as an anode material.…”

“…Electrochemical measurements were conducted in a three compartment cell using a land battery test instrument. NiOOH/Ni(OH) 2 Hg/HgO were used as the counter electrode and the reference electrode. In each charge-discharge cycle test, the negative electrode was charged for 5 h at 100 mA/g and discharged at 25 mA/g up to the cut-off voltage set at −0.5 V (versus Hg/HgO).…”

“…Mg-based hydrogen storage alloys are considered as one of the most promising candidates of the third generation alloys because of lower density, cost, and rich natural resources [1], especially for their discharge capacity which is as high as 999 mAh/g and much higher than that of other alloys such as AB 5 type, AB 2 type, and AB 3 type, so they have drawn much attention in this field [2,3]. These alloys, however, reveal relatively high H-desorption temperatures, slow kinetics of H-sorption and charge-discharge cycling stability, which make them difficult for practical applications as negative materials of Ni/MH batteries [4].…”

Microstructure of MmM5/Mg multi‐layer hydrogen storage films prepared by magnetron sputtering

“…With respect to the non-equilibrium structured Mgbased alloys, MA has mainly been applied to synthesize them. Many previous works (Aizawa et al, 1999;Berlouis et al, 2000;Hong et al, 2000;Lee et al, 2000) show that the properties of Mg-based hydrogen storage alloys are improved owing to the fact that MA may induce amorphous and/or nanocrystalline structures. .…”