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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.149 SNIP: 0.16 CiteScore™: 0.29

ISSN Imprimir: 2150-766X
ISSN On-line: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2012002746
pages 221-240

SYNTHESIS, CHARACTERIZATION, AND REACTION KINETICS OF NANO-STRUCTURED Mg−V−Ni COMPOSITES FOR SOLID-STATE HYDROGEN STORAGE

K. G. Bambhaniya
Electrical Research and Development Association, ERDA Road, Makarpura, Vadodara 390 010, India
G. S. Grewal
Electrical Research and Development Association, ERDA Road, Makarpura, Vadodara 390 010, India
Vagish Shrinet
Electrical Research and Development Association, ERDA Road, Makarpura, Vadodara 390 010, India
N. L. Singh
Physics Department, Faculty of Science, The Maharaja Sayajirao University of Baroda, 390 002, India
T. P. Govindan
Electrical Research and Development Association, ERDA Road, Makarpura, Vadodara 390 010, India

RESUMO

In this study, we have developed and characterized various Mg−V−Ni compositions with respect to hydrogen storage. The study was conducted using magnesium as the base material with additions of 5 atomic% of nickel and vanadium in the range of 2.5−10 atomic%. The various compositions were synthesized using high-energy ball milling with different milling times. The compositions were characterized using scanning electron microscopy, energy-dispersive X-ray spectrometry, and X-ray diffraction, and the hydriding−dehydriding characteristics studied using the Sievert method. It was found that the maximum reversible hydrogen storage capacity in the Mg−V−Ni system is 5.71 mass %. Furthermore, it was found that 6 mass% of hydrogen is absorbed within the first 5 min at 210° C. This lowered hydriding temperature is associated with the presence of vanadium as a catalyst. The hydriding enthalpy of the optimized (highest storage capacity) Mg−V−Ni composition has been measured using differential scanning calorimetry as 79.15 ± 3.56 kJ/mol of H2 and the hydriding entropy was obtained as 141.18 ± 6.35 J/mol of H2 K.


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