Mechanical alloying and electrochemical hydrogen storage of Mg-based systems

Results on mechanical alloying of binary and ternary Mg–Ti-based mixtures are reported. Using fine-powdered reactants and a process-control-agent, a mixture of two face-centered cubic compounds is obtained. Using a coarse Mg precursor without addition of a milling agent results in a hexagonal-solid...

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Bibliographic Details
Published in:Journal of materials research Vol. 23; no. 8; pp. 2179 - 2187
Main Authors: Kalisvaart, W.P., Notten, P.H.L.
Format: Journal Article
Language:English
Published: New York, USA Cambridge University Press 01.08.2008
Springer International Publishing
Springer Nature B.V
Subjects:
Applied and Technical Physics
Biomaterials
Cold
Crystal structure
Diffusion rate
Electrodes
Energy storage
Hydrogen
Hydrogen storage
Inorganic Chemistry
Intermetallic compounds
Magnesium
Materials Engineering
Materials Science
Mechanical alloying
Mixtures
Nanotechnology
Nickel base alloys
Nickel compounds
Oxygen content
Particle size
Process controls
Room temperature
Shape memory alloys
Solid solutions
Stainless steel
Storage capacity
Temperature
Thin films
Titanium compounds
United Kingdom > UK
Mechanical alloying
Mg
Energy storage
ISSN:0884-2914, 2044-5326
Online Access:Get full text
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Summary:Results on mechanical alloying of binary and ternary Mg–Ti-based mixtures are reported. Using fine-powdered reactants and a process-control-agent, a mixture of two face-centered cubic compounds is obtained. Using a coarse Mg precursor without addition of a milling agent results in a hexagonal-solid solution of Ti in Mg due to a lower oxygen content in the Mg starting material. Upon introduction of Ni or Al as a third element, the amount of dissolved Ti decreases to form a nanocrystalline secondary phase. The electrochemical charging capacity of the hexagonal compounds is far superior to that of the cubic ones, whereas the discharge capacity is significantly increased only upon addition of Ni. The secondary TiNi phase acts as a rapid diffusion path for hydrogen, greatly improving the rate capability of the alloys. The reversible hydrogen storage capacity reaches values of up to 3.2 wt% at room temperature for (Mg0.75Ti0.25)0.90Ni0.10.
Bibliography:PII:S0884291400029885
ArticleID:02988
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ISSN:0884-2914
2044-5326
DOI:10.1557/JMR.2008.0261