Enhanced CO2 electrolysis at metal-oxide interfaces

The catalytic reduction of CO2 to CO using solid oxide electrolytic cells (SOECs) is considered as a sustainable solution to simultaneously remove excessive CO2 in the air and creates valuable chemicals. It is well known that catalyst interface plays an important role in heterogeneous catalytic process. However, supported perovskite nanoparticles catalysts are still far away from satisfactory for industrial application. In this study, we prepare a series of double-layer perovskite materials Sr2Fe1.5+xMo0.5O6-delta (SF1.5+xM, x=0-0.1) through synergistic doping and pretreating for forming Fe/Sr2Fe1.5+xMo0.5O6-delta interface to enhance the catalytic activity. In addition, the well-constructed interface contributes to an extremely high current efficiency of similar to 92.6% at 1.4 V, 850 degrees C. The CO yield of Fe/SF1.5+xM with this well-developed interface is as high as 4.6 mL min(-1) cm(-2), which was two times more than that of SF1.5 M. We further demonstrate long-term stability of CO2 electrolysis even after a continuous operation of 100 h without carbon deposition. This inspires establishing well-contacted interface through exsolving metallic nanoparticles (NPs) over perovskite material for significantly improving catalytic activity and stability.