کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9804117 | 1516478 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrochemical properties of the ball-milled LaMg10Ni2âxAlx alloys with Ni powders (x = 0, 0.5, 1 and 1.5)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The structure and electrochemical hydrogen storage properties of the ball-milled LaMg10Ni2 alloys with Ni powder in the range of 50, 100 and 150 wt.%, respectively, were investigated. It was found that the amount of Ni addition was a key factor influencing the electrochemical properties. The amorphous (LaMg10Ni2 + 150 wt.% Ni) composite exhibited a high discharge capacity of 832 m Ah/g. The effect of partial substituted Al for Ni in the LaMg10Ni2 alloys on the electrochemical properties was also studied. The experimental results showed that the amorphous-like (LaMg10NiAl + 150 wt.% Ni) composite exhibited the highest discharge capacity of 953 m Ah/g, corresponding to a hydrogen storage capacity of 3.56 wt.%. The Al substitution for Ni in the LaMg10Ni2 alloys had a positive effect on the hydrogen storage capacity. But, the cycling stability needs to be improved when they are to be considered as electrode materials. The reason why the ball-milled (LaMg10NiAl + 150 wt.% Ni) composite had the highest hydrogen storage capacity was analyzed by powder X-ray diffraction (XRD) and electrochemical impedance spectra (EIS). The existence of a second phase (AlNi) in the LaMg10NiAl alloy probably plays an important role in the improvement of the catalytic activity and the electrochemical properties.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 389, Issues 1â2, 8 March 2005, Pages 290-295
Journal: Journal of Alloys and Compounds - Volume 389, Issues 1â2, 8 March 2005, Pages 290-295
نویسندگان
Y. Wang, Z.W. Lu, X.P. Gao, W.K. Hu, X.Y. Jiang, J.Q. Qu, P.W. Shen,