کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7886421 1509785 2018 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Reduction kinetics of undoped and aluminum titanate (Al2TiO5) doped NiO-YSZ solid oxide fuel cell anodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Reduction kinetics of undoped and aluminum titanate (Al2TiO5) doped NiO-YSZ solid oxide fuel cell anodes
چکیده انگلیسی
Undoped and 1-10 wt% aluminum titanate, Al2TiO5, (ALT) doped nickel oxide/yttria-stabilized zirconia (NiO/YSZ) anode materials were kinetically evaluated during isothermal (800 °C) H2 reduction (5% H2-95% N2 and pure H2 gas). It was found that the two parameter Avrami-Erofe'ev model (AEn) was the most successful in representing reduction kinetics. The reduction mechanisms have been identified as the formation and growth of nuclei and is maintained after aluminum titanate, Al2TiO5, (ALT) doping and when the H2 concentration in the gas flow is increased. ALT doped samples result in the formation of NiAl2O4; which, when present in sufficient amounts, slowly reduces causing a shift of the model from the experimental data. This phenomenon has been correlated, through microstructural evaluation, to the formation of Ni nanoparticles. In all investigated cases, the reduction kinetics of the system was accelerated when the H2 concentration was increased from 5% to 100%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 13, September 2018, Pages 15557-15564
نویسندگان
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