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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Vydané v:	Journal of materials research Ročník 23; číslo 8; s. 2179 - 2187
Hlavní autori:	Kalisvaart, W.P., Notten, P.H.L.
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	New York, USA Cambridge University Press 01.08.2008 Springer International Publishing Springer Nature B.V
Predmet:	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
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Shrnutí:	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.
Bibliografia:	PII:S0884291400029885 ArticleID:02988 istex:F7F02F928685DCB8147982108D555D2BDBB9F5F3 ark:/67375/6GQ-N9GG7H7L-X ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 ObjectType-Article-2 ObjectType-Feature-1 content type line 23
ISSN:	0884-2914 2044-5326
DOI:	10.1557/JMR.2008.0261