Direct CO2 Electrolysis on Symmetric La0.8Sr0.2Cr0.5Fe0.5O3-δ-Zr0.84Y0.16O2-δ Electrode-Supported Solid Oxide Electrolysis Cells

La0.8Sr0.2Cr0.5Fe0.5O3-delta (LSCrF) is a mixed ionic and electronic conductor with excellent stability in both reducing and oxidizing atmospheres. Herein, we prepared a symmetric tri-layer structure of porous YSZ-LSCrF divide dense YSZ divide porous YSZ-LSCrF by the tape casting and lamination techniques. Porous scaffolds of 80 wt% LSCrF - 20 wt% YSZ showed good conductivities and reasonably high performance for direct CO2 electrolysis with a current density of 0.84 Acm(-2) at 850 degrees C. Infiltrating Sm0.2Ce0.8O2-delta (SDC) catalysts into both porous scaffolds enhanced their catalytic activities for CO2 reduction and oxygen evolution reactions, yielding an increased electrolysis current density of 1.3 Acm(-2) at 850 degrees C and 1.5 V. Impedance measurements showed a pronounced decrease in the total interfacial polarization resistance at 1.5 V, i.e., 0.34 vs 0.66 omega cm(2). In addition, these symmetric cells exhibited good short-term stability at various voltages from 1.0 to 1.6 V.

Automated summary

In this study, a symmetric tri-layer structure was prepared using the mixed ionic and electronic conductor LSCrF, and the efficiency of CO2 electrolysis was improved by infiltrating SDC catalysts into the porous scaffolds.