| 초록 |
Solid oxide electrolysis cell (SOEC) is an efficient system for CO2 electrolysis. However, its cathode material has suffered from performance degradation and low catalytic activity. In this study, we prepare a (La,Sr)2(Mn,Fe)O4 with in situ exsolved Fe nanoparticles (Fe-R.P.LSMF) by directly reducing a perovskite-derivate of LSMF for use as SOEC cathode. During the reduction process, perovskite-derivate is transformed into Ruddlesden-popper phase with the formation of strongly socketed Fe nanoparticles on the surface of the catalyst. The single cell with Fe-R.P.LSMF cathode shows an outstanding current density value at a voltage of 1.3 V and temperature of 850 ℃ with a very high Faraday efficiency. Furthermore, the cell shows a stable performance in current density over the 100 h continuous operation, indicating the Fe-R.P.LSMF is quite robust cathode material for the CO2 electrolysis. In situ exsolved Fe nanoparticles formed on the surface of catalyst are responsible for its electrochemical performance and high stability. Therefore, the Fe-R.P.LSMF developed in this study could give an opportunity to be applied as a promising cathode material for the CO2 electrolysis reaction. |
