Bi/CeO₂-Decorated CuS Electrocatalysts for CO₂-to-Formate Conversion.

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Electrocatalytic reduction of carbon dioxide (CO2RR) is crucial for carbon neutralization.
• Copper sulfide (CuS) shows promise for C1 product synthesis but struggles with formate selectivity.

Purpose of the Study:

• To develop a highly selective catalyst for CO2 conversion to formate.
• To enhance the efficiency of electrocatalytic carbon dioxide reduction.

Main Methods:

• Synthesis of a bismuth (Bi)/cerium dioxide (CeO2)/copper sulfide (CuS) composite via a solvothermal method.
• Electrocatalytic testing in an H-cell to evaluate performance.

Main Results:

• The Bi/CeO2/CuS catalyst achieved 88% Faraday efficiency and 17 mA cm-2 current density for formate production.
• The composite structure effectively lowered the energy barrier for OCHO* intermediates, boosting CO2 conversion to formate.
• The Ce4+/Ce3+ conductive network facilitated electron transfer and stabilized active species.

Conclusions:

• The Bi/CeO2/CuS composite demonstrates superior performance for CO2 to formate conversion.
• This catalyst design offers a promising pathway for targeted product synthesis in CO2RR.
• The findings contribute to the development of advanced catalysts for carbon capture and utilization.