کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7957157 | 1513860 | 2018 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhanced hydrogen sorption kinetics of co-doped MgH2 hydrides
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مکانیک محاسباتی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Double substituted MgH2 sorption kinetic is studied by combining density functional theory (DFT) and Kinetic Monte Carlo (KMC) simulations. The DFT calculations were performed to compute the energy barriers of the relevant elementary processes, which will be used as a database for the KMC simulations. The study provides a discussion of the mechanism behind the hydrogen reaction path on magnesium hydride (adsorption, dissociation, surface migration, penetration, and diffusion) as we took into account the density distribution of hydrogen atoms as well as the filling ratios, the diffusion time and finally the temperature. Based on the obtained results, the double substitution not only improves MgH2 stability and desorption temperature but also its adsorption and desorption kinetics. Among the studied systems Mg14ZnLiH32 exhibits the best results with the fastest ab/desorption kinetic, in addition to its ideal heat of formation ÎH=-38.27â¯kJ/mol and high gravimetric capacity 7.25â¯wt%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 152, September 2018, Pages 192-195
Journal: Computational Materials Science - Volume 152, September 2018, Pages 192-195
نویسندگان
M. El Khatabi, M. Bhihi, M. Lakhal, M. Abdellaoui, A. Benyoussef, A. El Kenz, M. Loulidi,