کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7921250 | 1511746 | 2018 | 27 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhanced hydrogen storage properties of K2TiF6 doped Mg-Na-Al composite system
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The present investigation has introduced the hydrogen storage properties of MgH2+NaAlH4 (4:1) composite system with the addition of 10â¯wt% K2TiF6 by ball milling method for the first time. It is found that the K2TiF6-doped MgH2+NaAlH4 composite has better hydrogen storage properties compared to that of undoped composite. From the temperature programmed desorption result, the decomposition temperatures for two-step dehydrogenation stages that attributed to the NaAlH4 and MgH2 were reduced by 70â¯Â°C and 225â¯Â°C respectively, as compared to the undoped composite. The apparent activation energy of the Mg-relevant decomposition for the 4MgH2+NaAlH4+ K2TiF6 composite was reduced to 96.4â¯kJ/mol as compared to the undoped 4MgH2+NaAlH4 composite (124.9â¯kJ/mol). The X-ray diffraction analysis displayed formation of new phases; the Al3Ti, the TiH2 and the KF in the doped composite after de/rehydrogenation processes. It is believed that these new phases may responsible as catalysts in the K2TiF6-doped MgH2+NaAlH4 composite.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 217, 15 September 2018, Pages 350-356
Journal: Materials Chemistry and Physics - Volume 217, 15 September 2018, Pages 350-356
نویسندگان
N.S. Mustafa, M. Ismail,