کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7724937 | 1497837 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Enhanced mechanical stability of Ni-YSZ scaffold demonstrated by nanoindentation and Electrochemical Impedance Spectroscopy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The electrochemical performance of Ni-YSZ SOFC anodes can quickly degrade during redox cycling. Mechanical damage at interfaces significantly decreases the number of active triple phase boundaries. This study firstly focuses on the sintering temperature impact on YSZ scaffold mechanical properties. The YSZ scaffold sintered at 1200â¯Â°C exhibited 56% porosity, 28.3â¯GPa elastic modulus and 0.97â¯GPa hardness and was selected for further redox cycling study. The Ni infiltrated YSZ scaffold operated at 550â¯Â°C had an initial stabilized polarisation resistance equal to 0.62â¯Î©â¯cm2 and only degraded to 2.85â¯Î©â¯cm2 after 15 redox cycles. The active triple phase boundary density was evaluated by FIB-SEM tomography, and degraded from 28.54â¯Î¼mâ2 to 19.36â¯Î¼mâ2. The YSZ scaffold structure was robust after 15 redox cycles, as there was no observation of the framework fracturing in both SEM and FIB-SEM images, which indicated that the mechanical stability of YSZ scaffold improves the anode stability during redox cycling. Nonetheless, Ni agglomeration could not be prevented within Ni-YSZ scaffolds and this needs further consideration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 395, 15 August 2018, Pages 205-211
Journal: Journal of Power Sources - Volume 395, 15 August 2018, Pages 205-211
نویسندگان
B. Song, E. Ruiz-Trejo, N.P. Brandon,