کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7710571 1497403 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluation of strontium-site-deficient Sr2Fe1.4Co0.1Mo0.5O6−δ-based perovskite oxides as intermediate temperature solid oxide fuel cell cathodes
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Evaluation of strontium-site-deficient Sr2Fe1.4Co0.1Mo0.5O6−δ-based perovskite oxides as intermediate temperature solid oxide fuel cell cathodes
چکیده انگلیسی
In this paper strontium-site-deficient Sr2Fe1.4Co0.1Mo0.5O6−δ-based perovskite oxides (SxFCM) were prepared and evaluated as the cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). All samples exhibited a cubic phase structure and the lattice shrinked with increasing the Sr-deficiency as shown in XRD patterns. XPS results determined that the transition elements (Co/Fe/Mo) in SxFCM oxides were in a mixed valence state, demonstrating the small polaron hopping conductivity mechanism existed. Among the samples, S1.950FCM presented the lowest coefficient of thermal expansion of 15.62 × 10−6 K−1, the highest conductivity value of 28 S cm−1 at 500 °C, and the lowest interfacial polarization resistance of 0.093 Ω cm2 at 800 °C, respectively. Furthermore, an anode-supported single cell with a S1.950FCM cathode was prepared, demonstrating a maximum power density of 1.16 W cm−2 at 800 °C by using wet H2 (3% H2O) as the fuel and ambient air as the oxidant. These results indicate that the introduction of Sr-deficiency can dramatically improve the electrochemical performance of Sr2Fe1.4Co0.1Mo0.5O6−δ, showing great promise as a novel cathode candidate material for IT-SOFCs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Hydrogen Energy - Volume 41, Issue 22, 15 June 2016, Pages 9538-9546
نویسندگان
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