کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7744559 | 1498227 | 2018 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Co-incorporating enhancement on oxygen vacancy formation energy and electrochemical property of Sr2Co1 + xMo1 â xO6 â δ cathode for intermediate-temperature solid oxide fuel cell
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Theoretical and experimental endeavor were combined to investigate effects of Co-incorporating on crystal structure and oxygen vacancy formation energy and their influence on Sr2Co1 + xMo1 â xO6 â δ electrochemical performance systematically. From the X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), it is found that introducing Co decreases the ordering of B-site cations. Most importantly, Co3 + content increases with the increasing Co, indicating more Co-O*-Co pairs are introduced within the compounds. Additionally note that the electrochemical performance of the materials is improved apparently when more Co is incorporated. Sr2Co1.5Mo0.5O6 â δ has an area-specific polarization resistance (ASR) as low as 0.030 Ω cm2 in a symmetrical cell at 800 °C. First-principles calculations found that the sequence of the oxygen vacancy formation energy was Co-O*-Co < Co-O*-Mo, indicating that Co-doping facilitates formation of oxygen vacancy, which coincides well with experimental results. Therefore, Co-incorporating in Sr2CoMoO6 is an efficient way to enhance electrochemical performance of cathode for IT-SOFCs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 316, March 2018, Pages 20-28
Journal: Solid State Ionics - Volume 316, March 2018, Pages 20-28
نویسندگان
Wenwen Zhang, Junling Meng, Xiong Zhang, Lifang Zhang, Xiaojuan Liu, Jian Meng,