Brass and Bronze as Effective CO₂ Reduction Electrocatalysts.

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Electrochemical reduction of carbon dioxide (CO2) to fuels is crucial for renewable energy storage.
• Developing efficient catalysts is key to overcoming challenges in CO2 conversion.
• Ternary alloys offer tunable properties for enhanced catalytic performance.

Purpose of the Study:

• To screen ternary copper-zinc-tin (Cu-Zn-Sn) alloys for CO2 electroreduction.
• To identify catalysts with high Faradaic efficiency and partial current density.
• To evaluate catalyst performance at low overpotentials.

Main Methods:

• Photodeposition techniques were employed for catalyst screening.
• Electrocatalytic reduction of CO2 was performed using Cu-Zn-Sn alloys.
• Faradaic efficiency and partial current densities were measured.

Main Results:

• Cu0.2Zn0.4Sn0.4 and Cu0.2Sn0.8 alloys showed high selectivity for CO and formate production, respectively.
• Faradaic efficiencies exceeding 80% were achieved for both CO and formate.
• Partial current densities of 3 mA cm-2 were obtained at an overpotential of only 200 mV.

Conclusions:

• Cu-Zn-Sn ternary alloys are promising electrocatalysts for CO2 reduction.
• The identified alloys demonstrate efficient conversion of CO2 to valuable products.
• Low overpotential requirements suggest practical applicability in renewable energy systems.