Citation: YU Ya-Ze, SUN Li-Ping, ZHAO Hui, HUO Li-Hua. Preparation and Electrochemical Properties of LaBiMn₂O₆-Sm_0.2Ce_0.8O_1.9 Composite Cathode for IT-SOFCs[J]. Chinese Journal of Inorganic Chemistry, ;2019, 35(4): 589-597. doi: 10.11862/CJIC.2019.081 shu

Preparation and Electrochemical Properties of LaBiMn₂O₆-Sm_0.2Ce_0.8O_1.9 Composite Cathode for IT-SOFCs

Key laboratory of Functional Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China

Corresponding author: ZHAO Hui, zhaohui98@yahoo.com
Received Date: 26 November 2018
Revised Date: 21 February 2019

Figures(9)

The composite cathode LaBiMn₂O₆-Sm_0.2Ce_0.8O_1.9 (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 (R_p) 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 (R_P=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.
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Preparation and Electrochemical Properties of LaBiMn₂O₆-Sm_0.2Ce_0.8O_1.9 Composite Cathode for IT-SOFCs