Improvement approaches of hydrogen sorption process in magnesium

• Autorzy: David E.
• Języki publikacji: EN

Abstrakty

EN

Purpose: of this paper is to study the possibility of use of magnesium hydrides as energy carriers. The hydride, MgH2 , can store up to 7.6 wt. % of hydrogen,but there are three problems with the application of pure Mg: (a) the rate at which hydrogen absorbs and desorbs is too low;(b) the hydrogen molecules do not readily dissociate at the surface of Mg to generate the hydrogen atoms that diffuse into metal; (c) the hydrogen desorption takes place at high temperature. Design/methodology/approach: as magnesium can be use as hydrogen storage material is to improve hydrogenation / dehydrogenation process by allyoing with other metals such as Ni and Al. Nanocrystalline magnesium based alloys were prepared by ball milling. The milling was carried out with a planetary mill and the effect of Ni and Al addition was investigated by means of thermogravimetry analysis (TGA), X-ray diffraction analysis (XRD) and scanning electronic microscopy (SEM). Findings: Through this study it was found that the above problems could be solve by forming of small magnesium and magnesium based alloy crystals using ball milling technique. The addition of small amount of nickel, can catalyse the bond breaking / formation of the hydride event at the surface. The alloying with aluminium was shown that the thermodynamical properties - lower desorption temperatures and kinetic of hydrogen sorption process were improved along with improved resistance to O2 contamination. Practical implications: The inclusion of Ni and Al into magnesium by mechanical ball milling leads to lower the hydrogen desorption temperature from hydride and kinetic improvement of hydrogen sorption process in magnesium. Addition of Ni and Al to Mg also represents new approach of improvement of materials based on light metals, that can provide promising results for the hydrogen storage applications. Originality/value: The results presented in this paper contributes to elucidate the hydrogen sorption process in magnesium based alloys for to increase their hydrogen storage capacity. Because the hydrogen has the highest heating value of all chemical fuel and is environmentally harmless, in future it will become the most important energy carrier and magnesium alloys can compete with other materials for to achieve very efficient hydrogenstorage systems.

Słowa kluczowe

EN

metallic alloys; magnesium; hydrogen; sorption

PL

stopy metali; magnez; wodór; sorpcja

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2006
• Tom: Vol. 17, nr 1-2
• Strony: 33--36
• Opis fizyczny: Bibliogr. 15 poz., rys., wykr.

Twórcy

autor

David E.

• National Research Institute of Cryogenics & Isotope Technologies, P.O.Box 10, Rm.Valcea, Code 240050, Romania

Bibliografia

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