کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7739965 | 1497993 | 2013 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Performance of La0.1Sr0.9Co0.8Fe0.2O3âδ and La0.1Sr0.9Co0.8Fe0.2O3âδ-Ce0.9Gd0.1O2 oxygen electrodes with Ce0.9Gd0.1O2 barrier layer in reversible solid oxide fuel cells
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
La0.1Sr0.9Co0.8Fe0.2O3âδ (LSCF1982) and La0.1Sr0.9Co0.8Fe0.2O3âδ-Ce0.9Gd0.1O2 (LSCF1982-GDC) composite oxygen electrodes with a GDC barrier layer are tested in yttria stabilized zirconia (YSZ) electrolyte-based reversible solid oxide cells (RSOCs). Three button cell assemblies (1: NiO-YSZ|YSZ/GDC|LSCF1982; 2: NiO-YSZ/NiO-YSZ|YSZ/GDC|LSCF1982; and 3: NiO-YSZ/NiO-YSZ|YSZ/GDC|LSCF1982-GDC) are fabricated and their performance in solid oxide fuel cell (SOFC) and solid oxide electrolysis cell (SOEC) modes are studied at different temperatures (600 â¤Â T/°C â¤Â 800). The use of porous NiO-YSZ functional layer between hydrogen electrode and electrolyte leads to improvements in SOFC and SOEC (SOFC/SOEC) performance by improving the diffusion of reacting species inside the electrode. The effect of nature of oxygen electrode on SOFC/SOEC performance is studied, which indicates LSCF1982 oxygen electrode gives better performance than LSCF1982-GDC composite oxygen electrode, but LSCF1982-GDC composite oxygen electrode is more durable during reversible SOFC/SOEC operations. Stability of the button cells is studied in galvanostatic SOEC operation for 72 h and in reversible SOFC/SOEC operations. Current-voltage (I-V) tests and Electrochemical Impedance Spectroscopy (EIS) measurements indicate that the button cells show stable operation in SOEC mode. But successive SOFC â SOEC â SOFC operations indicate that the cells are not completely reversible. The possible reason for poor reversibility is found to be related with the grain growth in LSCF1982-based oxygen electrodes.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 239, 1 October 2013, Pages 361-373
Journal: Journal of Power Sources - Volume 239, 1 October 2013, Pages 361-373
نویسندگان
Moon-Bong Choi, Bhupendra Singh, Eric D. Wachsman, Sun-Ju Song,