Abstract
Electrochemical reduction of CO2 into valuable chemicals is an effective way to achieve carbon neutrality. Here, we report a method to synthesize a Zn-Bi bimetallic catalyst (Zn-Bi2O3/CN) with excellent performance in electrochemical CO2 reduction reaction (ECO2RR), consisting of Bi2O3/CN decorated with Zn. Particularly, the Zn-Bi2O3/CN could achieve high FEC1 (FEC1 = 97%, FEFormate = 91%, and FECO = 6%) at −1.0 V vs. RHE with the current density of 108 mA cm−2 in a flow cell, and could still maintain excellent catalytic activity after 12 h of electrolysis. The shift in the electronic structure by the Zn-Bi bimetals synergistic effect was the primary reason for the remarkable catalytic activity. Density Functional Theory and In-situ ATR-SEIRAS showed that the charge redistribution caused by the Zn-Bi bimetals synergistic effect stabilizes the generation of HCOO* intermediates and promotes the conversion of CO2 to C1 products, especially formate.
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