کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7914182 | 1510941 | 2018 | 24 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterization of PrNiO3-δ as oxygen electrode for SOFCs
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
The praseodymium nickelate PrNiO3-δ was recently identified as one of the decomposition products of Pr2NiO4+δ oxygen electrode, raising the question of the role of this perovskite compound on the Pr2NiO4+δ performance and ageing behaviour. Herein, the electrochemical properties of PrNiO3-δ as cathode for Solid Oxide Fuel Cells (SOFCs) is reported. PrNiO3-δ, synthesized from the citrate-nitrate route, cristallizes in an orthorhombic structure (S.G.: Pnma). Under air, a transition to high temperature rhombohedral structure (S.G.: R-3c) occurs at around 600â¯Â°C, while its oxygen vacancy amount increases from δ â0.05â¯at room temperature up to 0.10â¯at high temperature. Thermal gravimetry analysis (TGA) measurements coupled with X-ray diffraction (XRD) characterizations show that above 1000â¯Â°C, in air, PrNiO3-δ starts to decompose into Pr2NiO4+δ and NiO through an intermediate transformation into Pr4Ni3O10+δ. The value of the polarization resistance (Rp) of co-sintered GDC-PrNiO3-δ electrode, at 950â¯Â°C in air for 2â¯h, is 0.91â¯Î©â¯cm2 at 600â¯Â°C under air. It remains much higher than that of co-sintered GDC-Pr2NiO4+δ electrode (Rpâ¯=â¯0.15â¯Î©â¯cm2), which means that the perovskite does not play any significant role in the electrochemical performance during long term operation of the Pr2NiO4+δ electrode.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Sciences - Volume 81, July 2018, Pages 26-31
Journal: Solid State Sciences - Volume 81, July 2018, Pages 26-31
نویسندگان
Vaibhav Vibhu, Aurélien Flura, Clément Nicollet, Sébastien Fourcade, Nicolas Penin, Jean-Marc Bassat, Jean-Claude Grenier, Aline Rougier, Michel Pouchard,