Revealing the CO Coverage-Driven C-C Coupling Mechanism for Electrochemical CO₂ Reduction on Cu₂O Nanocubes via Operando Raman Spectroscopy.

ABSTRACT: Electrochemical reduction of carbon dioxide (CO₂RR) is an attractive route to close the carbon cycle and potentially turn CO₂ into valuable chemicals and fuels. However, the highly selective generation of multicarbon products remains a challenge, suffering from poor mechanistic understanding. Herein, we used operando Raman spectroscopy to track the potential-dependent reduction of Cu₂O nanocubes and the surface coverage of reaction intermediates. In particular, we discovered that the potential-dependent intensity ratio of the Cu-CO stretching band to the CO rotation band follows a volcano trend similar to the CO₂RR Faradaic efficiency for multicarbon products. By combining operando spectroscopic insights with Density Functional Theo

SUBMITTER: Zhan C 

PROVIDER: S-EPMC8256421 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature