Tuning ORR electrocatalytic functionalities in CGFO-GDC composite cathode for low-temperature solid oxide fuel cells |
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Affiliation: | 1. Energy Storage Joint Research Center, School of Energy and Environment, Southeast University, No.2 Si Pai Lou, Nanjing, 210096, PR China;2. Key Laboratory of Ferro and Piezoelectric Materials and Devices of Hubei Province, Faculty of Physics and Electronic Science, Hubei University, Wuhan, Hubei, 430062, PR China;3. School of Electrical Engineering and Automation, Wuhan University, Wuhan, 430072, Hubei Province, PR China;4. Institute of Physics, The islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan;5. School of Electronic Engineering, Nanjing Xiaozhuang University, Nanjing, 211171, PR China |
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Abstract: | Mixed ionic and electronic conduction (MIEC) in the composite cathode can alter oxygen stoichiometry and other physiochemical properties, eventually promoting the electrocatalytic functionalities for oxygen reduction reaction (ORR) at low operational temperatures (<650 °C). Here, we demonstrate a composite cathode of CoGd0.8Fe1.80O4 /Gd0.10Ce0.9O2?δ (CGFO-GDC), which delivers low electrode polarization resistance of 0.60 Ω cm2 at 550 °C. The best-performing sample CGFO-GDC exhbits the peak power density (PPD) of 611-343 mW cm?2 at 550-470 °C under a fuel cell conditions. Moreover, durability measurement verifies CGFO-GDC as a chemically stable cathode with improved ORR catalytic functionality. Additionally, first principle calculations using density function theory (DFT) were also conducted to analyze the ion diffusion mechanism of fabricated CGFO-GDC cathode. Our findings certify that introducing ionic conducting GDC into CGFO sample improves the catalytic functionalities. As a result, the composite CGFO-GDC based SOFC delivers minimum electrode polarization resistance with improved power output owing to its enhanced oxygen vacancies and fast catalytic reactions at 550 °C. |
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Keywords: | SOFC Composite cathode First principle calculations Electrochemical performances Oxygen reduction reaction |
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