کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7709921 | 1497393 | 2016 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mg-Ti nanoparticles with superior kinetics for hydrogen storage
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Mg-Ti nanoparticles with superior kinetics for hydrogen storage Mg-Ti nanoparticles with superior kinetics for hydrogen storage](/preview/png/7709921.png)
چکیده انگلیسی
Mg nanoparticles (NPs) with addition of Ti catalysts were synthesised by inert gas condensation and in situ hydrogenation at 150 °C. The NPs size and composition were systematically investigated by scanning electron microscopy, energy dispersive X-ray spectroscopy and powder X-ray diffraction (PXD), while time resolved in situ synchrotron radiation-PXD was used to monitor the mechanism for hydrogen uptake and release at 280 °C. The Mg-Ti NPs reveal activation energies of 68 kJ molâ1 for absorption and 78 kJ molâ1 for desorption by isothermal kinetics analysis, similar to the lowest values reported in the literature for MgH2 using Nb2O5 as a catalyst. Hence, hydrogen desorption (pdes = 8 mbar) and absorption (pabs = 260 mbar) is achieved at 200 °C in â¼2000 s, while keeping 5.3 wt% storage capacity. Thermodynamic data extracted from van 't Hoff plots reveal unchanged values compared to bulk MgH2. Therefore, the improved hydrogen storage performances are assigned to the enhanced kinetics only.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 41, Issue 32, 24 August 2016, Pages 14447-14454
Journal: International Journal of Hydrogen Energy - Volume 41, Issue 32, 24 August 2016, Pages 14447-14454
نویسندگان
Marco Calizzi, Domizia Chericoni, Lars H. Jepsen, Torben R. Jensen, Luca Pasquini,