کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1465214 989684 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical performance of LSM–SDC electrodes prepared with ion-impregnated LSM
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Electrochemical performance of LSM–SDC electrodes prepared with ion-impregnated LSM
چکیده انگلیسی

(La0.85Sr0.15)0.9MnO3−δ (LSM)–Sm0.2Ce0.8O1.9 (SDC) (50:50 wt.%) composites, which are potential cathodes for intermediate-temperature solid oxide fuel cells, were prepared with a two-step fabricating process including screen-printing and ion-impregnation. SDC frame was screen-printed on electrolyte substrates and LSM was subsequently ion-impregnated to the SDC frame. The interfacial polarization resistances (area specific resistances) of the resulted electrodes were much lower than those prepared with a conventional screen-printing technique and also lower than those with impregnated SDC. At 700 °C, the total resistance was only 0.35 Ω cm2 for an LSM–SDC electrode with impregnated LSM compared to 0.94 Ω cm2 for a conventional electrode. Impedance spectroscopy was used to study the oxygen reduction kinetics within the electrodes. Three arcs were typically observed on the impedance spectrum. The high-frequency arc was attributed to oxygen ion transfer from the three-phase boundary to the electrolyte, while the intermediate-frequency arc was attributed to oxygen dissociation and adsorption. At high temperature, the arc due to gas phase diffusion was observed in the low frequency region, with size varying as (Po2)−0.76 and having low activation energy.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 35, Issue 6, August 2009, Pages 2213–2218
نویسندگان
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