Microstructures and electrode performances of Mg50Ni(50-X)Pdx alloys

• Authors: Sydney Santos , José Castro , Edson Ticianelli
• Languages of publication: EN

Abstracts

EN

Magnesium and several of its alloys can absorb large amounts of hydrogen. This feature is desirable for several technological applications such as solid state hydrogen storage tanks and anodes of nickel-metal hydride (Ni-MH) batteries. For the latter, Mg-Ni alloys are considered very promising due to their high discharge capacities. Conversely, the low stability of Mg-Ni alloys in alkaline electrolytes have hindered their practical use. In the present manuscript, the effects of palladium black addition on the structure and electrochemical properties of the Mg50Ni50 (in at.%) alloy were investigated. The studied ternary alloys have general composition of Mg50Ni(50-x)Pdx, with 0 ≤ x ≤ 5 (in at.%). These alloys were synthesized by mechanical alloying from pure elements. The alloy powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray absorption spectroscopy (XAS) while their electrode performances were evaluated by galvanostatic cycles of charge and discharge. The investigated alloys have multi-phase structures composed of amorphous and nanocrystalline phases, with nano-grain sizes of nearly 5 nm. Concerning the electrode performance, the best results were attained by the Mg50Ni47.5Pd2.5 alloy, which kept a high discharge capacity and improved the cycling stability. [...]

Keywords

EN

Nickel - metal hydride batteries; Hydrogen storage alloys; Mechanical alloying

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2013
• Volume: 11
• Issue: 4
• Pages: 485-491

Dates

published

1 - 4 - 2013

online

23 - 1 - 2013

Contributors

author

Sydney Santos

• CECS, UFABC, 09.210-170, Santo André — SP, Brazil

author

José Castro

• MHNano Ltd., 13566-445, São Carlo, SP, Brazil

author

Edson Ticianelli

• IQSC, USP, CP 780 13560-970, São Carlos — SP, Brazil

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Identifiers

DOI

10.2478/s11532-012-0182-3