Structures and hydrogen storage performances of rare earth-Mg-Ni-Mn-based AB2-type alloys applied to Ni-MH battery

Zhang, Yanghuan; Li, Yaqin; Shang, Hongwei; Yuan, Zeming; Yang, Tai; Guo, Shihai

doi:10.1007/s10008-016-3455-5

Cited by 8 publications

(2 citation statements)

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“…A dramatic refinement happens in the grains of ascast alloys with Ce substitution for Mg. Similar results have been found in the investigations of A 2 B 7 -type and AB 2 -type alloys [29,30]. The grain refinement is in favor of enhancing the strength and toughness of alloys, consequently improving their anti-pulverization capability [31].…”

Section: Methodssupporting

confidence: 85%

“…Young et al [28] added Al in Mg-Ni-based alloys, which increased the cycle stability of alloys. A study made by us before showed that the discharge capacity, electrochemical kinetics and cycle stability of Mg-Ni-based alloys can be improved by adding Ce [29]. Meanwhile, a Ni coating layer, in addition to corrosion inhibition, can behave as an electrocatalytic role in electrochemical processes, like hydrogen diffusion inside alloys and charge transfer on the alloy surface.…”

Section: Introductionmentioning

confidence: 99%

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Structure and Electrochemical Hydrogen Storage Properties of as-Milled Mg–Ce–Ni–Al-Based Alloys

Zhang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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At room temperature, crystalline Mg-based alloys, including Mg 2 Ni, MgNi, REMg 12 and La 2 Mg 17 , have been proved with weak electrochemical hydrogen storage performances. For improving their electrochemical property, the Mg is partially substituted by Ce in Mg-Ni-based alloys and the surface modification treatment is performed by mechanical coating Ni. Mechanical milling is utilized to synthesize the amorphous and nanocrystalline Mg 1−x Ce x Ni 0.9 Al 0.1 (x = 0, 0.02, 0.04, 0.06, 0.08) + 50 wt%Ni hydrogen storage alloys. The effects made by Ce substitution and mechanical milling on the electrochemical hydrogen storage property and structure have been analyzed. It shows that the as-milled alloys electrochemically absorb and desorb hydrogen well at room temperature. The as-milled alloys, without any activation, can reach their maximal discharge capacities during first cycling. The maximal value of the 30-h-milled alloy depending on Ce content is 578.4 mAh/g, while that of the x = 0.08 alloy always grows when prolonging milling duration. The maximal discharge capacity augments from 337.4 to 521.2 mAh/g when milling duration grows from 5 to 30 h. The cycle stability grows with increasing Ce content and milling duration. Concretely, the S 100 value augments from 55 to 82% for the alloy milled for 30 h with Ce content rising from 0 to 0.08 and from 66 to 82% when milling the x = 0.08 alloy mechanically from 5 to 30 h. The alloys' electrochemical dynamics parameters were measured as well which have maximum values depending on Ce content and keep growing up with milling duration extending.

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Section: Methodssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%