Compositionally continuously graded cathode layers of (Ba_0.5Sr_0.5)(Fe_0.91Al_0.09)O_{3鈭?span style='font-style: italic'>未}-Gd_0.1Ce_0.9O₂ by wet powder spraying technique for solid oxide fuel cells

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• 作者：Taizhi Jiang ; Zhenhua Wang ; Baiyu Ren ; Jinshuo Qiao ; Wang Sun ; Kening Sun
• 关键词：Continuously graded cathode layers ; Thermal expansion behavior ; Wet powder spraying ; Solid oxide fuel cells
• 刊名：Journal of Power Sources
• 出版年：1 February, 2014
• 年：2014
• 卷：247
• 期：Complete
• 页码：858-864
• 全文大小：2551 K

文摘

Compositionally continuously graded cathode layers (CGCLs) of (Ba_0.5Sr_0.5)(Fe_0.91Al_0.09)O_3鈭?em>未-Gd_0.1Ce_0.9O₂ (BSFA-GDC) have been constructed by a handy and effective technique called wet powder spraying (WPS). CGCLs exhibit similar thermal expansion coefficient (TEC) value between adjacent thin layers. The continuously graded structure and the well-distributed components of BSFA-GDC cathode are confirmed by morphological characterization with scanning electron microscopy (SEM), and by compositional analysis with energy dispersion X-ray spectrometer (EDS), respectively. The polarization resistance (R_p) of CGCLs with three different thicknesses is investigated by electrochemical impedance spectra (EIS). The EIS results show that CGCLs with a moderate thickness of 20聽渭m achieve the lowest R_p of 0.301聽惟聽cm² at 800聽掳C. In addition, anode-supported single cells with the configuration of NiO-YSZ/YSZ/GDC/BSFA-GDC have been fabricated and tested. The cell with the CGCLs thickness of 20聽渭m reaches the highest output power density of 848聽mW聽cm^鈭? at 800聽掳C.