کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10624459 | 989594 | 2016 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and properties of SmBaCo2âxNixO5+δ perovskite oxide for IT-SOFC cathodes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Double perovskite oxides SmBaCo2âxNixO5+δ (SBCNx) (x=0-0.5) are synthesized via an EDTA-glycine process as cathodes for intermediate temperature solid oxide fuel cells (IT-SOFCs). In this study, we investigate the effects of Ni substitution for the Co sites in SmBaCo2O5+δ (SBCO) in terms of structural characteristics, electrical properties, and electrochemical performance of SBCNx. At the given temperature, the electrical conductivities of SBCNx decrease as the Ni content increases, and SBCO exhibits a maximum conductivity of 1091 S cmâ1 at 250 °C. The average thermal expansion coefficients (TEC) over the temperature range of 25-800 °C show a decreased trend from 19.96Ã10â6 Kâ1 for SBCO to 16.26Ã10â6 Kâ1 for SBCN0.5, while the average TEC of SBCN0.3 reaches a minimum of 15.59Ã10â6 Kâ1. Generally, the power density of a single fuel cell at 600-800 °C decreases as the Ni content increases, whereas the polarization resistance (RP) of SBCNx on a Sm0.2Ce0.8O1.9 (SDC) electrolyte is enhanced. Among all of the samples, SBCN0.3 exhibits a combination of low thermal expansion (15.59Ã10â6 Kâ1), a reasonably low RP value (0.0464 Ω cm2 at 800 °C) and high power density (536 mW cmâ2 at 800 °C); thus, it may be a promising candidate for IT-SOFCs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 42, Issue 1, Part B, January 2016, Pages 1272-1280
Journal: Ceramics International - Volume 42, Issue 1, Part B, January 2016, Pages 1272-1280
نویسندگان
Li-Na Xia, Zhi-Ping He, X.W. Huang, Yan Yu,