Pr 2 Ni 0.8 Co 0.2 O 4+ δ impregnated La 0.6 Sr 0.4 CoO 3- δ oxygen electrode for efficient CO 2 electroreduction in solid oxide electrolysis cells.

The solid oxide electrolysis cell (SOEC) is an advanced electrochemical device with a promising future in reducing CO 2 emissions. Currently, the insufficient oxygen evolution reaction activity in conventional anode materials severely restricts the development of electrolytic CO 2 . Herein, the PNCO-LSC composite oxygen electrode was exploited by impregnating Pr 2 Ni 0.8 Co 0.2 O 4+ δ (PNCO) on the surface of La 0.6 Sr 0.4 CoO 3- δ (LSC) oxygen electrode. The results of electrochemical tests and various physicochemical characterizations indicate that the infiltration of PNCO can lead to a significant improvement in the performance of the cell for CO 2 electroreduction by increasing the surface oxygen exchange. The current density of the PNCO-LSC oxygen electrode infiltrated twice at 800 °C and 1.5 V reaches 0.917 A cm -2 , which is about 40% higher than that of the bare LSC oxygen electrode. In addition, the single cell did not show significant degradation in a long-term stability test at a current density of 0.4 A cm -2 for 100 h of electrolysis. Therefore, the PNCO-LSC composite oxygen electrode material is effective in enhancing electrolytic CO 2 performance.