Abstract
Carbon dioxide reduction reaction on the fuel electrode is critical for CO2 conversion in solid oxide electrolysis cell, which is a promising technology to utilize CO2 and store electricity from intermittent renewable resources. This work presents a highly active electrocatalyst, strontium doped lanthanum ferrite (LSF), for direct CO2 reduction reaction, which is conducted in single cells with La0.9Sr0.1Ga0.8Mg0.2O3 as the electrolyte and La0.6Sr0.4Co0.2Fe0.8O3-δ as the air electrode. A current density of 0.76 A cm−2 is achieved at 800 °C and 1.5 V when pure CO2 is electrolyzed. By adding samaria-doped ceria to form composite fuel electrodes, the performance can be effectively improved. The current density increases from 0.76 to 1.06 A cm−2 while the total interfacial polarization resistance decreases from 0.26 to 0.12 Ω cm2. Furthermore, LSF exhibits high rate constant for CO2 reduction reaction, 1.04 × 10−4 cm s−1 at 700 °C. CO2 is favorable to form carbonate species on LSF surface, and the existence of carbonate species on LSF surface revealed by Raman spectra technique is further proved by DFT calculations. A proposed CO2 reduction mechanism is obtained, providing new insights into CO2 adsorption and dissociation on LSF surface.
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