Issue 8, 2024

Acidic chloride electrolyte mediates the high conversion ratio of CO2-to-C2H4 and direct production of Cl2

Abstract

Electrochemical CO2 reduction (CO2R) in acidic electrolytes can effectively overcome the challenge of carbonate formation and poor carbon utilization efficiency of CO2R in alkaline and neutral electrolytes. The corresponding anodic reaction design in an acidic environment therefore becomes important to overcome the valueless products and high energy consumption of the oxygen evolution reaction (OER) that hinder the overall commercial value of CO2R systems. Herein, we designed an efficient coupling system of electrochemical CO2 reduction and chlorine oxidation in an acidic electrolyte to reduce CO2 loss and improve the sustainability of the reaction system. We modulated the local microenvironment to promote C–C coupling by combining the cation effect with the larger surface area CuO nanoparticle catalyst in an acidic electrolyte. As a result, this coupling system can achieve high C2H4 and Cl2 faradaic efficiencies (FEs) of 63% and 89% at 700 mA cm−2 simultaneously. The system is commercially promising as it stably produces valuable products at both the cathode and anode.

Graphical abstract: Acidic chloride electrolyte mediates the high conversion ratio of CO2-to-C2H4 and direct production of Cl2

Supplementary files

Article information

Article type
Paper
Submitted
28 Dec 2023
Accepted
07 Mar 2024
First published
21 Mar 2024

Sustainable Energy Fuels, 2024,8, 1730-1739

Acidic chloride electrolyte mediates the high conversion ratio of CO2-to-C2H4 and direct production of Cl2

C. Kang, C. Ding, Y. Li, Y. Li, C. Li and J. He, Sustainable Energy Fuels, 2024, 8, 1730 DOI: 10.1039/D3SE01717F

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