Efficient electrolysis of CO2 in symmetrical solid oxide electrolysis cell with highly active La0.3Sr0.7Fe0.7Ti0.3O3 electrode material

• Direct electrolysis of CO2 is demonstrated by the symmetrical SOEC based on LSFT electrodes.
• LSFT electrode shows the excellent electrocatalytical activity toward CO2 reduction.
• Symmetrical SOEC shows good durability in pure CO2 electrolysis operation.

Novel perovskite-type La0.3Sr0.7Fe0.7Ti0.3O3 (LSFT) oxide is investigated as both anode and cathode materials in a symmetrical solid oxide electrolysis cell (SOEC) for direct electrolysis of pure CO2 at 800 °C. The current density is 521 mA cm− 2 at an applied voltage of 2.0 V. The lowest polarization resistance Rp of this symmetrical SOEC is obtained at 2.0 V with a value of as low as 0.08 Ω cm2, which is much lower than that of other perovskite and Ni-cermet cathode. LSFT cathode also shows excellent durability in pure CO2 electrolysis, especially at high voltage of 2.0 V. Our results indicate that the LSFT is a promising alternative electrode material for CO2 electrolysis.

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