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| Preparation and Electrochemical Properties of LaBiMn2O6-Sm0.2Ce0.8O1.9 Composite Cathode for IT-SOFCs |
| Author Name | Affiliation | E-mail | | YU Ya-Ze | Key laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China | | | SUN Li-Ping | Key laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China | | | ZHAO Hui | Key laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China | zhaohui98@yahoo.com | | HUO Li-Hua | Key laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China | |
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| Abstract: The composite cathode LaBiMn2O6-Sm0.2Ce0.8O1.9 (LBM-SDC) was prepared by glycine-nitrate combustion method. The phase and morphology evolution of the composite cathode were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results showed that LBM had good chemical stability with SDC at 1 000℃. Due to the introduction of SDC, the length of the thriple-phase boundary was extended and the thermal matching between the cathode and the electrolyte was enhanced, resulting in an improvement in the electrochemical performance of the composite cathode. The electrochemical impedance spectrum (EIS) results indicated that the cathode polarization resistance (Rp) decreased steadily with the addition of SDC. The optimum addition of 30%(w/w) SDC in the composite cathode leads to the lowest Rp of 0.186 Ω·cm2 at 700℃ in air, which is 74% less than the pristine LBM cathode (RP=0.717 Ω·cm2). This is because an additional oxygen ion conduction path is generated after the introduction of SDC; thereby the oxygen reduction reaction is promoted. The maximum power density of the electrolyte-support single cell Ni-SDC/SDC/LBM-30%SDC reached 234 mW·cm-2 at 700℃. The power density maintains a stable value at 230 mW·cm-2 throughout a test period of 90 h, indicating that LBM-30%SDC had sufficient stability during the operation. The oxygen partial pressure measurement indicated that the oxygen molecule adsorption-diffusion process is the reaction rate-limiting step of the composite cathode. |
| Keywords: intermediate temperature solid oxide fuel cell (IT-SOFCs) LaBiMn2O6-Sm0.2Ce0.8O1.9 composite cathode electrode reaction oxygen reduction reaction |
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| YU Ya-Ze,SUN Li-Ping,ZHAO Hui,HUO Li-Hua.Preparation and Electrochemical Properties of LaBiMn2O6-Sm0.2Ce0.8O1.9 Composite Cathode for IT-SOFCs[J].Chinese Journal of Inorganic Chemistry,2019,35(4):589-597. |
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