Probing the Electrochemical Performance of SrFe0.9Ti0.1O3- for the Symmetric Electrode in Solid Oxide Fuel Cells
ACS APPLIED ENERGY MATERIALS(2024)
摘要
Symmetric electrodes are critical for lowering manufacturing costs and commercializing solid oxide fuel cell (SOFC) technology. SrFeO3-derived electrode materials demonstrated considerable potential for symmetrical SOFCs. The present work comprehensively investigates the electrochemical performance of SrFe0.9Ti0.1O3-delta as symmetric electrodes. The powder is synthesized using the solid-state reaction method. Despite stabilizing the cubic perovskite phase, a significant oxygen deficiency within the lattice is determined. Upon testing the symmetrical half-cells at 800 degrees C, SrFe0.9Ti0.1O3-delta offers an extremely low initial area specific resistance (ASR) of 0.03 Omegacm(2) in O-2 and 0.067 Omegacm(2) in 3%H2O/H-2. Although the ASR remains unchanged in O-2, it increases to 0.24 Omegacm(2) in 3%H2O/H-2 after 100 h of thermal aging. Similar behavior is seen on redox cycling the half-cells. The ASR increase in reducing conditions is attributed to the microcracks generation. The electrolyte-supported symmetrical single cells deliver a maximum power density of 509 mWcm(-2) at 800 degrees C. This value declines to 409 mWcm(-2) on thermal aging for 100 h. A power density loss similar to 449 mWcm(-2) is seen on performing multiple redox cycles (at the anode side) at 800 degrees C. Interestingly, a slight increase in electrode polarization resistance is recorded during these tests, highlighting the stability of the SrFe0.9Ti0.1O3-delta electrode in the SOFC environment.
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关键词
symmetric electrodes,solid oxide fuel cells,power density,SrFeO3,perovskite
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