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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