Dual-atom Ag2/graphene catalyst for efficient electroreduction of CO2 to CO

By Yifan Li, Chang Chen, Rui Cao, Ziwei Pan, Hua He, Kebin Zhou. 2020

175 citations recorded by the source corpus.

Abstract Electrochemical reduction of CO2 into value-added carbon compounds offers a promising strategy to mitigate global warming, but present challenges for chemistry due to the poor selectivity and stability of electrocatalysts. In this work, we report a dual-atom Ag2/graphene catalyst featuring well-defined AgN3-AgN3 active site for CO2 electrochemical reduction. This dual-atom catalyst can drive CO2 reduction reaction at a potential as high as -0.25 V, and exhibit excellent CO Faradic efficiency up to 93.4 % with a current density of 11.87 mA cm−2 at -0.7 V and long-term stability, far surpassing the single-atom Ag1/graphene and the traditional silver nanoparticle catalysts. DFT calculations reveal that the dual-atom Ag site lowers the barrier for the formation of *COOH by stabilizing the *CO2 through the concomitant interactions with the C and an O atom of CO2, resulting in excellent catalytic performance.

Subfields: Catalysis, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/7bbd104dcdafa8d8321054ecbf9b89f7b32842e5