Hexagonal prism-shaped CuO/SnO₂ heterostructure for high-performance CO₂ER to formate

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Electrochemical reduction of carbon dioxide (CO2ER) is a promising route for sustainable chemical production.
• Developing efficient and selective catalysts is crucial for advancing CO2ER technologies.
• Tin oxide (SnO2)-based materials show potential but often require modification to enhance performance.

Purpose of the Study:

• To design and synthesize a CuO/SnO2 heterostructured catalyst for enhanced CO2ER.
• To investigate the role of the heterostructure and electron-enriched active sites in catalytic performance.
• To evaluate the catalyst's activity, selectivity, and durability in CO2 reduction to formate.

Main Methods:

• Synthesis of hexagonal prism-shaped CuO/SnO2 heterostructures.
• Electrochemical characterization including cyclic voltammetry and chronoamperometry.
• Product analysis to determine Faradaic efficiency (FE) for formate (HCOO-).
• Durability testing to assess catalyst stability over time.

Main Results:

• The CuO/SnO2 heterostructure exhibited significantly enhanced catalytic activity for CO2ER compared to pure SnO2.
• High selectivity towards formate (HCOO-) production was achieved, with FE up to 97% at -0.9 V vs. RHE.
• The catalyst demonstrated excellent durability, maintaining FE above 80% for over 36 hours.
• The hexagonal prismatic architecture contributed to both catalytic and morphological stability.

Conclusions:

• The designed CuO/SnO2 heterostructure effectively enhances CO2 electrochemical reduction to formate.
• Electron-enriched SnO2 active sites at the CuO/SnO2 heterointerface are key to improved performance.
• The catalyst's unique architecture provides stability, making it a promising candidate for industrial CO2 utilization.