کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1282641 1497588 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Improvement in the electrochemical properties of gas atomized AB2 metal hydride alloys by hydrogen annealing
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Improvement in the electrochemical properties of gas atomized AB2 metal hydride alloys by hydrogen annealing
چکیده انگلیسی

The effects of high temperature hydrogen annealing were studied on powders made by gas atomization of both conventional vanadium-containing AB2 metal hydride alloys and new vanadium-free AB2 alloys designed for high power and low self-discharge applications. In both alloy systems, annealing in 950 °C hydrogen for 30 min was proven to be effective in improving the capacity, formation, high power, and low temperature performance in the nickel metal hydride battery compared to previous gas atomization trials where each property was reduced. The advantage in improving the cycle life by gas atomization was further extended by the hydrogen annealing process. Reduction in the surface oxide was confirmed by the use of Auger electron spectroscopy depth profiling and magnetic susceptibility. Metallic elements were reduced from the oxide state by hydrogen to react with the metallic nickel particulates originally embedded in the surface oxide in a high temperature environment and created a new surface free of oxygen.

Research highlights
► Annealing condition of gas atomized powder was optimized.
► Annealing in hydrogen was demonstrated to improve NiMH battery performance.
► Mechanism of surface restoration was introduced.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 36, Issue 5, March 2011, Pages 3547–3555
نویسندگان
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