کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1284250 1497986 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanostructuring of SmBa0.5Sr0.5Co2O5+δ cathodes for reduced-temperature solid oxide fuel cells
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Nanostructuring of SmBa0.5Sr0.5Co2O5+δ cathodes for reduced-temperature solid oxide fuel cells
چکیده انگلیسی


• SmBa0.5Sr0.5Co2O5+δ/LSGM cathode of nanostructure is fabricated by impregnation method.
• The lowest ARS values of SmBa0.5Sr0.5Co2O5+δ/LSGM cathode is 0.035 Ω cm2 at 550 °C and 0.12  Ω cm2 at 500 °C.
• Power densities of 1.5 W cm−2 at 600 °C and 0.70 W cm−2 at 500 °C were obtained.

Here we report the fabrication of composite cathodes for reduced-temperature solid oxide fuel cells by impregnating aqueous solutions corresponding to SmBa0.5Sr0.5Co2O5 (SBSCO) into the porous La0.9Sr0.1Ga0.8Mg0.2O3−δ (LSGM) backbones. Examination of X-Ray diffraction patterns indicates that phase-pure SBSCO layered perovskite oxides can be only achieved at calcination temperatures ≥900 °C. Based upon impedance measurement of symmetric cells, the SBSCO–LSGM composites calcinated at 850 °C show a trade-off between the SBSCO phase purity and catalyst size, and thereby exhibit minimal cathode polarization resistances with respect to the infiltrate calcination temperature, e.g., 0.035 Ω cm2 at 550 °C and 0.12 Ω cm2 at 500 °C at the loadings of 21 wt%. Analysis of impedance spectra under varied oxygen partial pressures suggests that oxygen reduction reactions on the nano-scale SBSCO–LSGM composite are largely dominated by ionization of adsorbed oxygen atoms on the SBSCO surfaces. Thin LSGM electrolyte fuel cells with impregnated Ni anodes and SBSCO cathodes show high power densities of 1.5 W cm−2 at 600 °C and 0.70 W cm−2 at 500 °C.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 246, 15 January 2014, Pages 409–416
نویسندگان
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