Abstract
Perovskite oxides are widely used as electrodes in solid oxide electrolysis cell (SOEC) due to their good performance and structural stability. In the meantime, surface modification can promote adsorption and activation, which will significantly improve the catalytic activity of perovskite. Herein, an electro-reduction activation strategy is attempted to activate the electrochemical activity of A-site deficiency La0.43Ca0.37Ti0.9Ni0.1O3-γ (LCTN) perovskite as fuel electrode of SOEC for CO2 electrolysis. The results confirm that more adsorption and activation sites can be produced on the surface of LCTN after electro-reduction treatment. Under an electro-reduction voltage of 2.8 V in N2, the polarization impedance of LCTN can be reduced from 0.859 to 0.208 Ω·cm2 at 1.3 V and 800 °C for CO2 electrolysis. And the cell with LCTN fuel electrode shows stable long-term performance for CO2 electrolysis with a current density of 450 mA cm−2 in nearly 100 h at 1.4 V and 800 °C. This work provides a possibility for facile and fast electrode optimization strategy for SOEC.
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