Synthesis, characterization and hydrogen storage properties of Mm(Ni, Co, Mn, Al)5 alloy

Publish Year: 1393
نوع سند: مقاله ژورنالی
زبان: English
View: 435

This Paper With 12 Page And PDF Format Ready To Download

  • Certificate
  • من نویسنده این مقاله هستم

استخراج به نرم افزارهای پژوهشی:

لینک ثابت به این Paper:

شناسه ملی سند علمی:

JR_IJHFC-1-2_003

تاریخ نمایه سازی: 21 فروردین 1397

Abstract:

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.

Authors

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