Issue 19, 2023

Stabilizing Cu0–Cu+ sites by Pb-doping for highly efficient CO2 electroreduction to C2 products

Abstract

The electrochemical CO2 reduction reaction (CO2RR) can convert CO2 to C2 hydrocarbons and oxygenate over Cu-based catalysts, and has great potential to store renewable energy and close the carbon cycle. Developing a facile method to modify the local electronic structure of Cu is a useful way to design efficient catalysts. Herein, we design a Pb-doping Cu2O catalyst with controllable Cu0–Cu+ sites. The catalyst generated a high C2 faradaic efficiency (FE) of 83.9% with a current density of 203.8 mA cm−2 at −1.1 V vs. RHE in a flow cell. In situ X-ray absorption spectroscopy and Raman spectroscopy revealed that the Pb doping in Cu2O could stabilize the Cu0–Cu+ structure and enhance the CO adsorption and C–C coupling, leading to high activity for C2 product formation. Theoretical calculations also show that Pb doping could reduce the energy barrier for both CO2 activation and C–C coupling processes.

Graphical abstract: Stabilizing Cu0–Cu+ sites by Pb-doping for highly efficient CO2 electroreduction to C2 products

Supplementary files

Article information

Article type
Paper
Submitted
07 May 2023
Accepted
14 Aug 2023
First published
15 Aug 2023

Green Chem., 2023,25, 7635-7641

Stabilizing Cu0–Cu+ sites by Pb-doping for highly efficient CO2 electroreduction to C2 products

X. Ma, X. Song, L. Zhang, L. Wu, J. Feng, S. Jia, X. Tan, L. Xu, X. Sun and B. Han, Green Chem., 2023, 25, 7635 DOI: 10.1039/D3GC01506H

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