Enhancing catalytic activity of CO2 electrolysis by building efficient and durable heterostructure for solid oxide electrolysis cell cathode

Solid oxide electrolysis cell (SOEC) has great application prospects in the fields of renewable energy storage, CO2 capture and utilization. One of the key factors hindering the development of SOEC is the lack of suitable cathode materials. In this study, we designed and developed a kind of new micro-nano heterostructure materials Co@Sr1.95Fe1.4Co0.1Mo0.4Ti0.1O6-delta (Co@SFCMT), Co nanoparticles uniformly distributed on the SFCMT matrix and provided rich electric catalytic active sites, SFCMT showed excellent oxygen ion transport performance. The synergistic effect of Co nanoparticles and Sr1.95Fe1.4Co0.1Mo0.4Ti0.1O6-delta (SFCMT) increased the rate of CO2 reduction reaction (CO2RR). At 1.8 V and 800 degrees C, the maximum electrolytic current density of the cell with Co@SFCMT as the cathode reached 2.57 A cm(-2). In addition, Co@SFCMT showed good stability at 1.5 V and 750 degrees C, with no performance decay even after 200 h of continuous operation. The micro-nano heterostructure design strategy of perovskite oxides will not only open new avenues for designing SOEC electrodes, but also be expected to promote the development of other energy storage and conversion systems.

Automated summary

In this study, a new micro-nano heterostructure material Co@Sr1.95Fe1.4Co0.1Mo0.4Ti0.1O6-delta (Co@SFCMT) was designed and developed for SOEC cathodes. The Co@SFCMT showed excellent oxygen ion transport performance and increased the rate of CO2 reduction reaction (CO2RR). The maximum electrolytic current density reached 2.57 A cm(-2) at 1.8 V and 800 degrees C, and the stability of Co@SFCMT was observed at 1.5 V and 750 degrees C even after 200 h of continuous operation. The micro-nano heterostructure design strategy of perovskite oxides has promising applications in SOEC electrodes and other energy storage and conversion systems.