Fang-Ze Han,Jing-Hui Zhang,Shan-Lin Zhang,Cheng-Xin Li
Sr(Ti 1-x Fe x )O 3−δ (STF) perovskite has been developed as one of the alternatives to Nickel-base fuel electrodes for solid oxide electrochemical cells (SOCs) that can provide good tolerance to redox cycling and fuel impurities. Recent results on STF fuel electrodes present excellent electrochemical performance and outstand stability both under H 2 fuel cell mode and H 2 O electrolysis mode, however, the electrochemical characteristics in other fuel gases , such as CO, CO–H 2 mixture, CH 4 , and CO–CO 2 mixture have not been investigated. Herein, we report the electrochemical performance of Sr(Ti 0.3 Fe 0.7 )O 3−δ fuel electrode on La 0.8 Sr 0.2 MnO 3−δ -Zr 0.92 Y 0.16 O 2−δ (LSM-YSZ) oxygen electrode supported SOCs with thin YSZ electrolyte using different fuel gases. At 800 °C, the peak power density slightly decreased from 0.9 W/cm 2 in wet H 2 to 0.68 W/cm 2 in wet CO under fuel cell mode. However, the cell only showed a peak power density of 0.27 W/cm 2 at 800 °C in wet CH 4 , reaching 0.75 W/cm 2 at 850 °C, when the open-circuit voltage increased from 0.9 V to 1.02 V. STF fuel electrode exhibited much worse CO 2 electrolysis performance than steam electrolysis, especially in high CO 2 concentration due to the increased ohmic resistance and electrode polarization resistance.
The development of solid-oxide cells requires fuel electrodes capable of promoting highly catalytic activities for CO 2 electrochemical reduction (CO 2 R). This study develops a fuel electrode material, Sr(Ti 0·3 Fe 0·63 Ru 0.07 ) O 3-δ (STFR) perovskite, enhance with in-situ exsolved Fe–Ru nanoparticles (STFR–FeRu), demonstrating excellent electrochemical catalytic activity for CO 2 R, considerable stability, and high selectivity for CO 2 electrolysis. Notably, the study discovered for the first time that STFR–FeRu exhibits significantly enhanced catalytic activity in a CO 2 -containing atmosphere compares to that in hydrogen-based fuels. At 800 °C and 1.3 V, La 0·8 Sr 0.2 Ga 0.8 Mg 0·2 O 3-δ electrolyte-supported cells with STFR–FeRu fuel electrode, for direct CO 2 electrolysis, realizes a current density of 1.77 A cm −2 . This current density is 50 % higher than that of H 2 O electrolysis under the same conditions. Additionally, the cell achieves a current density of 1.54 A cm −2 for CO 2 –H 2 O co-electrolysis, with a high CO 2 electrolysis selectivity (CO concentration exceeding 60 % in the electrolysis products).
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