Structure-Tunable Copper-Indium Catalysts for Highly Selective CO₂ Electroreduction to CO or HCOOH

Area of Science:

• Catalysis
• Materials Science
• Electrochemistry

Background:

• Developing selective catalysts for chemical manufacturing is crucial.
• Electrochemical reduction of carbon dioxide (CO2) offers a sustainable route to valuable chemicals.
• Bimetallic copper-indium (Cu-In) catalysts show promise for CO2 reduction.

Purpose of the Study:

• To synthesize and characterize composition-tunable bimetallic copper-indium (Cu-In) catalysts.
• To investigate the structure-dependent selectivity of Cu-In catalysts for CO2 electroreduction.
• To establish a relationship between catalyst structure, composition, and product selectivity (CO vs. HCOOH).

Main Methods:

• Coprecipitation method for synthesizing Cu-In catalysts.
• Electrochemical CO2 reduction experiments.
• Analysis of product selectivity by varying the metal ratio and catalyst structure.

Main Results:

• Cu-In catalysts were synthesized with tunable structures (core-shell to well-mixed) by adjusting the metal ratio.
• Catalyst structure significantly influenced selectivity: core-shell favored CO production, while well-mixed favored HCOOH production.
• Selectivity is linked to structure-sensitive binding of reactive intermediates.

Conclusions:

• Composition-tunable Cu-In catalysts offer selective electrochemical CO2 reduction to CO or HCOOH.
• Catalyst structure plays a critical role in determining product selectivity.
• These findings provide a foundation for designing advanced selectivity-tunable catalysts for CO2 conversion.