| 초록 |
Electrochemical carbon dioxide reduction reaction (CO2RR) powered by renewable energy is considered as a promising solutions to converting anthropogenic CO2 emissions into value-added chemicals or fuel. Recently, space confinement effect has attracted great attention as a feasible approach to improve catalysis, engineering space confined nanoparticle structure to improve activity and selectivity of desired products for electrocatalytic CO2RR is of interest. Tin (Sn) based catalysts have been regarded as a promising candidate for CO2RR to produce formate. However, it still suffer from the large overpotential and fast deactivation. Herein, Lithium-electrochemical tuning (LiET) proceses was utilized to design novel nano-architectured SnOx catalyst. The electrochemically tuned SnOx catalyst exhibited improved activity toward CO2-to-formate conversion with high faradaic efficiency (≥75%) in a wide potential from −0.9 to −1.2 VRHE and acquired the maximum of 81.0% at −1.2 VRHE which are 11.7 times higher partial current density and 1.2 times higher selectivity towards formate, compared to commercial pristine SnO2 nanoparticles. Furthermore, it can maintain electrochemical performance for CO2RR over 50 h. Therefore, these results indicate new insight to explore the catalyst design to regulate the confined nanostructures with enhanced performance for the integration into practical devices. |
