Synthesis, characterization and hydrogen storage properties of Mm(Ni, Co, Mn, Al)5 alloy
سال انتشار: 1393
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 443
فایل این مقاله در 12 صفحه با فرمت PDF قابل دریافت می باشد
- صدور گواهی نمایه سازی
- من نویسنده این مقاله هستم
استخراج به نرم افزارهای پژوهشی:
شناسه ملی سند علمی:
JR_IJHFC-1-2_003
تاریخ نمایه سازی: 21 فروردین 1397
چکیده مقاله:
This paper investigates hydrogenation characterizations and effect of hydrogenation/dehydrogenation (H/D) cycling on the structural and morphological properties of MmNi4.22Co0.48Mn0.15Al0.15 (Mm=mischmetal) alloy. The alloy was prepared by arc melting method and it was re-melted several times under argon atmosphere. The results indicate that after several H/D cycles, the alloy is pulverizedinto fine particles, however, it keeps its hexagonal LaNi5-type structure. The pressure-composition isotherms of H/D reactions and absorption kinetics were measured in the temperature range 293-338K. The absorption plateau pressures were determined to be ~0.51, 1.22 and 2.49 bar at 293, 313 and 333K respectively, with a maximum hydrogen storage capacity of about 5.78 at 293K. The enthalpy (ΔH),entropy (ΔS) and the activation energy of reactions (Ea) were also calculated. The results show the hydrogenation reaction rate increases with an increase in the operating temperature or pressure. The Jander diffusion (JDM) and Johnson-Mehl -Avrami (JMA) models were employed and the kinetic of hydrogenation was analyzed in detail for hydriding reaction (rate controlling steps) mechanism. Theresults indicate that the MmNi4.22Co0.48Mn0.15Al0.15 alloy has potential for use in practical applications.
کلیدواژه ها:
نویسندگان
Seyyed Mojtaba Alavi Sadr (Zareii)
Magnetism and Superconducting Research Laboratory, Department of Physics, Faculty of Science, University of Birjand, Birjand, Iran
Hadi Arabi
Department of Physics, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
Faiz Pourarian
Department of Material Science and Engineering, Carnegie Mellon University, Pittsburgh, PA, USA