کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7719259 | 1497491 | 2014 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal decomposition of non-catalysed MgH2 films
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Nanocrystalline Mg films with thicknesses between 45 and 900 nm were prepared by e-beam on fused-SiO2 substrates and hydrogenated at 280 °C to investigate the H-absorption/desorption process. Films were characterized by XRD, RBS, Raman, FEG, “in situ” optical measurements and TPD-MS. Whereas practically full conversion into MgH2 is observed in thinner films (d < 150-200 nm), higher amount of hydrogen is not absorbed by thicker films (d > 200-250 nm) that is attributed to the formation of Mg2Si-MgO phases (observed by RBS and Raman) as well as the slow kinetics of MgH2 formation. H-desorption process is controlled by a nucleation and growth process and hydrogen is released at lower desorption temperatures (Td = 425 °C) than bulk MgH2. Td are slightly lower (ÎT â¼Â 25 °C) in thickest hydrogenated films (d > 200-250 nm) suggesting an influence of Mg2Si and MgO phases, formed during hydrogenation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 18, 15 June 2014, Pages 9865-9870
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 18, 15 June 2014, Pages 9865-9870
نویسندگان
M. Barawi, C. Granero, P. DÃaz-Chao, C.V. Manzano, M. Martin-Gonzalez, D. Jimenez-Rey, I.J. Ferrer, J.R. Ares, J.F. Fernández, C. Sánchez,