Direct Electrolysis of CO2 in Symmetrical Solid Oxide Electrolysis Cell Based on La0.6Sr0.4Fe0.8Ni0.2O3-δ Electrode

Abstract

In this work, the symmetrical solid oxide electrolysis cell (SOEC) with the configuration of La0.6Sr0.4Fe0.8Ni0.2O3-δ (LSFN)-GDC/GDC/YSZ/GDC/LSFN-GDC is evaluated with electrochemical performance for direct electrolysis of pure CO2. The results find that the current density increases from 1.03 A/cm2 at 800°C to 1.52 A/cm2 at 850°C under an electrolysis voltage of 2.0 V and the polarization resistance (Rp) is as low as 0.12 Ω·cm2 at 800°C. The formation rates of CO can reach 5.16 and 6.35 mL/min·cm2 at the voltages of 1.8 and 2.0 V at 800°C, respectively. Furthermore, the cell also displays good stability in the short-term CO2 electrolysis test. The research confirms that this novel LSFN is a potential electrode material in symmetrical solid oxide electrolysis cell for pure CO2 electrolysis.