| Popis: |
The effective conversion of CO2, a greenhouse gas, into high value-added products such as formate through electrochemical processes has been a key catalytic challenge under environmental conditions. There are many ways to improve the activity and selectivity of electrocatalytic CO2 reduction reaction (ECO2RR), and adjusting the geometry and electronic structure of the bimetallic electrocatalysts to facilitate specific reaction pathways and provide more active sites is one of the most promising methods. In this work, we demonstrate a significant correlation between the selectivity of CO2R to formate and the co-electrodeposition potential of Cu-Bi bimetallic catalysts on the derived copper foams. A Cu-Bi co-electrodeposition potential of -0.8V led to a cathode with a formate Faradaic efficiency of around 93% at -0.92 V vs RHE, which was more than 45% higher than the -0.5V co-electrodeposition cathode Faradaic efficiency (around 64%) under the same conditions. This result highlights the important role of the co-electrodeposition potential in the performance of Cu-Bi bimetallic catalyst CO2R grown on derived foamed copper substrate. Scanning electron microscopy (SEM) showed that the defects on the derived copper foams provided more sites for catalyst attachment, and the co-electrodeposition potential affected the particle size of Cu-Bi bimetallic catalyst. |
