کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1283207 1497629 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation and electrochemical properties of La0.4Sr0.6FeO3 as negative electrode of Ni/MH batteries
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Preparation and electrochemical properties of La0.4Sr0.6FeO3 as negative electrode of Ni/MH batteries
چکیده انگلیسی

Perovskite-type oxide La0.4Sr0.6FeO3 powder was prepared by a stearic acid combustion method, and its phase structure, kinetic characteristics, and electrochemical properties were systematically investigated as the negative electrode for Ni/MH batteries. X-ray diffraction (XRD) shows that the as-prepared powder consists of a single phase with rhombohedral structure. After 20 cycles, perovskite-type structure still remains in the electrode sample. The electrochemical test shows that the reaction at the La0.4Sr0.6FeO3 electrode is reversible. With an increase in temperature from 298 K to 333 K, its initial discharge capacities increase from 153.4 mA h g−1 to 502.6 mA h g−1 at 31.25 mA g−1, and from 56.0 mA h g−1 to 279.6 mA h g−1 at 125 mA g−1, respectively. At a discharge current density of 125 mA g−1, its capacities keep steady at about 80.0 mA h g−1, 195 mA h g−1 and 370 mA h g−1 at 298 K, 313 K and 333 K, respectively. Both the exchange current density and the proton diffusion coefficient of the La0.4Sr0.6FeO3 oxide electrode also increase with temperature in a manner similar to the discharge capacity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 34, Issue 13, July 2009, Pages 5568–5573
نویسندگان
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