A crystalline-amorphous interface enriched CuS-SnS composite catalyst boosts electrochemical CO₂ reduction over a...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Electrochemical reduction of carbon dioxide (CO2) is a promising avenue for sustainable chemical production.
• Developing efficient and stable catalysts is crucial for advancing CO2 electroreduction technologies.
• Achieving high selectivity and efficiency across diverse pH conditions remains a significant challenge.

Purpose of the Study:

• To develop a novel composite catalyst for efficient electrochemical CO2 reduction.
• To investigate the performance of the catalyst across a broad pH range.
• To understand the structure-activity relationship of the crystalline-amorphous hybrid interfaces.

Main Methods:

• Synthesis of a copper sulfide-tin sulfide composite catalyst.
• Characterization of the catalyst's crystalline-amorphous hybrid interfaces.
• Electrochemical testing of CO2 reduction to formate in electrolytes spanning pH 1.81 to 13.28.

Main Results:

• The composite catalyst demonstrated high efficiency for CO2 electroreduction to formate.
• A maximum Faradaic efficiency of 93.9% was achieved for formate production.
• The catalyst maintained high performance across a wide operational pH range (1.81-13.28).

Conclusions:

• The developed copper sulfide-tin sulfide catalyst with crystalline-amorphous interfaces is highly effective for electrochemical CO2 reduction.
• The catalyst's broad pH applicability makes it a versatile candidate for industrial formate synthesis.
• The hybrid interface structure plays a key role in the catalyst's enhanced performance.