کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10155444 | 1666349 | 2018 | 52 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
An investigation on the microstructural and electrical properties of La0.85DxSr0.15-xGa0.8Mg0.2O2.825 (D = Ba and Ca) electrolytes in solid oxide fuel cells
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
La0.85DxSr0.15-xGa0.8Mg0.2O2.825 (D = Ba and Ca, xâ¯=â¯0, 0.01, 0.03, 0.05, and 0.07) electrolytes were synthesized using a solid-state reaction method, calcined at 1400â¯Â°C for 5â¯h, and sintered at 1400â¯Â°C for 5â¯h. The microstructures, electrical properties, and cell performances of the electrolytes and fuel cells were analyzed by X-ray diffraction, scanning electron microscopy, impedance analysis, and electrochemical analysis. La0.85BaxSr0.15-xGa0.8Mg0.2O2.825 (LBSGM) and La0.85CaxSr0.15-xGa0.8Mg0.2O2.825 (LCSGM) exhibit a dense structure and a cubic perovskite phase. Further, they contain small amounts of a secondary phase. The lattice constants of LBSGM and LCSGM are 0.3913-0.3914â¯nm and 0.3906-0.3909â¯nm, respectively. The average grain size of the sample increases with increasing Ba2+ or Ca2+ content. The conductivity of LCSGM (0.197-0.174â¯S/cm) is usually higher than that of LBSGM (0.181-0.162â¯S/cm) at 800â¯Â°C. The cells with La0.85Sr0.15Ga0.8Mg0.2O2.825 and La0.85Ca0.03Sr0.12Ga0.8Mg0.2O2.825 electrolytes exhibit high open-circuit voltages and maximum power densities of 0.96â¯V and 542â¯mW/cm2 and 0.94â¯V and 567â¯mW/cm2, respectively, at 800â¯Â°C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 16, November 2018, Pages 19706-19717
Journal: Ceramics International - Volume 44, Issue 16, November 2018, Pages 19706-19717
نویسندگان
Yu-Chuan Wu, Chen-Ruei Rao,