Electrocatalytic Reactions for Converting CO2 to Value-Added Products

Converting CO2 into valuable chemical products has been intensively explored in recent years. Benefited from the substantial cost reduction of clean electricity, the electrochemical methods have been emerging as a potential means for CO2 conversion and fixation. Direct electrochemical CO2 reduction reaction (CO2RR) with H2O is achieved with continuously improved efficiency, selectivity and stability. In contrast, the coupled CO2RR with small molecules and organic substrates, which can allow to form higher valuable chemicals, is still hindered by the poor selectivity, unclear reaction mechanisms, and suboptimal performances of electrocatalysts. Herein, the development of CO2RR with electrocatalysts and reaction mechanisms is first introduced. Several representative examples are described for emphasizing concepts and methodologies. The research process and reaction mechanisms of the coupled CO2RR are then briefly discussed. Finally, challenges and perspectives in this field are addressed to further inspire the development of the fundamental understanding of reaction mechanisms for coupled CO2RR, as well as the optimization of electrocatalysts, electrolytes, and electrolyzers with high activity and selectivity.