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Title of article :
Non-isothermal desorption process of hydrogenated nanocrystalline Pd-capped Mg films investigated by Ion Beam Techniques
Author/Authors :
Ares، نويسنده , , J.R. and Leardini، نويسنده , , F. and Dيaz-Chao، نويسنده , , P. and Ferrer، نويسنده , , I.J. and Fernلndez، نويسنده , , J.F. and Sلnchez، نويسنده , , C.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2014
Pages :
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Abstract :
Nanocrystalline Pd-capped Mg films were prepared by e-beam evaporation and hydrided/deuterated in order to investigate the hydride decomposition mechanism. To that aim, different techniques were used (XRD, FEG, TPD–MS, isotope exchange and “in situ” desorption optical measurements). Obtained results show that hydride films decomposed at T = 165 °C by a process controlled by the Mg/MgH2 interface reaction with an activation energy Ea = 136 ± 5 kJ/mol H2. Interface is located into each MgH2 nanocrystallite according to RBS (Rutherford Backscattering) and ERDA (Elastic Recoil Detection Analysis) measurements performed during hydride decomposition. Moreover, RBS and ERDA spectra also show the formation of a MgxPdy intermixed region. This intermixed region does not modify the type of control mechanism but increases the activation energy of the desorption process and slows down further hydrogenation events.
Keywords :
Hydrogen storage , Nanocrystalline film , Ion Beam Techniques , Magnesium hydride , Thermal desorption mechanism
Journal title :
International Journal of Hydrogen Energy
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