کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1288490 973265 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Solid oxide fuel cell composite cathodes based on perovskite and fluorite structures
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Solid oxide fuel cell composite cathodes based on perovskite and fluorite structures
چکیده انگلیسی

This work presents the results related to the functionally graded fluorite (F)–perovskite (P) nanocomposite cathodes for IT SOFC. Nanocrystalline fluorites (GDC, ScCeSZ) and perovskites (LSrMn, LSrFNi) were synthesized by Pechini method. Nanocomposites were prepared by the ultrasonic dispersion of F and P powders in isopropanol with addition of polyvinyl butyral. Different techniques for deposition and sintering of functionally graded cathode materials were applied including traditional approaches as well as original methods, such as radiation–thermal sintering under electron beam or microwave radiation. Morphology, microstructure and elemental composition of nanocomposites was characterized by XRD and HRTEM/SEM with EDX. Even for dense composites, the sizes of perovskite and fluorite domains remain in the nanorange providing developed P–F interfaces. Oxygen isotope heteroexchange and conductivity/weight relaxation studies demonstrated that these interfaces provide a path for fast oxygen diffusion. The redistribution of the elements between P and F phases in nanocomposites occurs without formation of insulating zirconate phases. Button-size fuel cells with nanocomposite functionally graded cathodes, thin YSZ layers and anode Ni/YSZ cermet (either bulk or supported on Ni–Al foam substrates) were manufactured. For optimized composition and functionally graded design of P–F nanocomposite cathodes, a stable performance in the intermediate temperature range with maximum power density up to 0.5 W cm−2 at 700 °C in wet H2/air feeds was demonstrated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 196, Issue 17, 1 September 2011, Pages 7104–7109
نویسندگان
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