Constructing heterogeneous asymmetric sites for highly-selective methane production from CO₂ electroreduction.

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Carbon dioxide (CO2) electroreduction is a promising pathway for sustainable fuel production.
• Developing efficient catalysts is crucial for selective methane (CH4) formation.
• Heterogeneous interfaces offer unique opportunities for catalytic enhancement.

Purpose of the Study:

• To engineer heterogeneous asymmetric sites at the Europium oxide (Eu2O3)/Copper oxide (CuO) interface.
• To enhance the methane formation pathway during CO2 electroreduction.
• To investigate the roles of specific metal oxide species in the catalytic process.

Main Methods:

• Fabrication of Eu2O3/CuO heterostructures.
• Electrochemical characterization of CO2 reduction performance.
• Analysis of intermediate stabilization and active species formation.

Main Results:

• Engineered asymmetric sites at the Eu2O3/CuO interface.
• Cu2+ species stabilized the key *CO intermediate.
• Eu3+ sites facilitated *CO hydrogenation via reactive *H species.
• Achieved a high Faradaic efficiency of 63.1% for methane production.

Conclusions:

• The Eu2O3/CuO heterostructure effectively promotes CO2 electroreduction to methane.
• Heterogeneous interfaces with tailored active sites are vital for efficient catalysis.
• This work presents a promising strategy for sustainable methane synthesis.