کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7733668 | 1497952 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Significantly improved electrochemical hydrogen storage properties of magnesium nickel hydride modified with nano-nickel
ترجمه فارسی عنوان
به طور قابل توجهی بهبود خواص الکتروشیمیایی ذخیره هیدروژن منیزیم هیدرید نیکل اصلاح شده با نانو نیکل
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کلمات کلیدی
آلیاژ ذخیره سازی هیدروژن بر پایه منیزیم، ریز ساختار، ویژگی های الکتروشیمیایی، اصلاح سطح،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
چکیده انگلیسی
Magnesium nickel hydride (Mg2NiH4) used as negative electrode material in nickel-metal hydride (Ni-MH) secondary battery is modified by nano-nickel via mechanical milling. In this paper, we systematically investigate the microstructure and electrochemical properties of the modified system with different milling durations. X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) analyses confirm the amorphous transformation of Mg2Ni-based hydride and a novel NiH0.75 nanocrystalline with a diameter of about 5 nm embedding or covering on the surface of the base particle has been observed. Its formation mechanism and positive effects on electrochemical properties of the Mg2NiH4 have also been elaborated. Electrochemical measurements show that the 5 h milled composite possesses markedly increased discharge capacity up to 896 mAh gâ1. With prolonging the milling duration from 5 h to 40 h, the discharge capacity at the 10th cycle increases from 99 mAh gâ1 to 359 mAh gâ1. Besides, the discharging procedure changes from stepwise processes to one single-step process with increasing the milling duration. Tafel polarization test shows that the nano-nickel modified system exhibits a much better anti-corrosion ability during charging/discharging cycles. Meanwhile, both the charge-transfer reaction on the alloy surface and hydrogen diffusion inside the alloy bulk are enhanced with nano-nickel modification.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 280, 15 April 2015, Pages 132-140
Journal: Journal of Power Sources - Volume 280, 15 April 2015, Pages 132-140
نویسندگان
Wei Chen, Yunfeng Zhu, Chen Yang, Jiguang Zhang, Menghuai Li, Liquan Li,