Selective CO₂ Reduction Electrocatalysis Using AgCu Nanoalloys Prepared by a "Host-Guest" Method.

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Multimetallic nanoalloy catalysts are crucial for improving efficiency and selectivity in electrochemical processes.
• Synthesizing homogeneous bimetallic alloy nanoparticles presents significant challenges.

Purpose of the Study:

• To develop a scalable and efficient method for preparing dilute copper in silver (Cu-Ag) alloy nanoparticles.
• To investigate the electrocatalytic performance of these nanoalloys for carbon dioxide (CO2) reduction.

Main Methods:

• A room-temperature host-guest synthesis approach was employed using a silver bromide precursor with copper cations.
• The precursor was reduced to form approximately 20 nm AgCu alloy nanoparticles with tunable copper loading.
• Electrocatalytic reduction of CO2 was performed using the synthesized AgCu nanoparticles.

Main Results:

• Precisely tunable copper loading in AgCu alloy nanoparticles was achieved.
• AgCu nanoparticles with 5% copper loading demonstrated peak activity (-0.23 mA/cm2) and selectivity (83.2% Faradaic efficiency) for CO production from CO2 reduction.
• The synthesized AgCu nanoalloys exhibited higher mass activity compared to other Ag- and Cu-based nanomaterials.

Conclusions:

• The host-guest synthesis platform offers a promising route for producing tailored nanoalloys.
• This method facilitates the creation of efficient and selective catalysts for electrocatalytic CO2 reduction.
• The developed nanoalloys have potential applications in catalysis and optics.