کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7718340 | 1497483 | 2014 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structures and properties of Mg-La-Ni ternary hydrogen storage alloys by microwave-assisted activation synthesis
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Structures and properties of Mg-La-Ni ternary hydrogen storage alloys by microwave-assisted activation synthesis Structures and properties of Mg-La-Ni ternary hydrogen storage alloys by microwave-assisted activation synthesis](/preview/png/7718340.png)
چکیده انگلیسی
It is a challenge to prepare a material meeting two conflicting criteria - absorbing hydrogen strongly enough to reach a stable thermodynamic state and desorbing hydrogen at moderate temperature with a fast reaction rate. With the guide of the Mg-La-Ni phase diagram, microwave sintering (MS) was successfully applied to preparing Mg-La-Ni ternary hydrogen storage alloys from the powder mixture of Mg, La and Ni. Their phase structures, morphologies and hydrogen absorption and desorption (A/D) properties have been studied by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), pressure-composition-isotherm (PCI) and differential scanning calorimetry (DSC). The metal hydride of 70 Mg-9.72 La-20.28 Ni (wt pct) has the best comprehensive hydriding and dehydriding (H/D) properties, which can absorb 4.1Â wt.% H2 in 600Â s and desorb 3.9Â wt.% H2 in 1500Â s at 573Â K. The DSC results reveal its onset temperatures of hydrogen A/D are the lowest among all the samples, which are 671.4 and 600.9Â K. Its activation energy of dehydriding reaction is 113.5Â kJ/mol H2, which is the smallest among all the samples. Also, Chou model was used to analyze the reaction kinetic mechanism.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 26, 3 September 2014, Pages 14247-14254
Journal: International Journal of Hydrogen Energy - Volume 39, Issue 26, 3 September 2014, Pages 14247-14254
نویسندگان
Qian Li, Yanbiao Pan, Haiyan Leng, Kuochih Chou,