Engineering an Fe₂O₃/FeS hybrid catalyst from a deep eutectic solvent for highly efficient electrocatalytic N₂...

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Nitrogen (N2) fixation is crucial for agriculture and industry.
• Developing efficient and cost-effective electrocatalysts for ammonia (NH3) synthesis remains a significant challenge.
• Current methods often require high energy input or rely on the Haber-Bosch process.

Purpose of the Study:

• To design and synthesize a novel hybrid electrocatalyst for efficient electrochemical N2 fixation.
• To investigate the catalytic performance of the hybrid material for ammonia (NH3) production.
• To explore the potential of deep eutectic solvent methods in catalyst design.

Main Methods:

• A hybrid catalyst composed of crystalline iron(III) oxide (Fe2O3) and amorphous iron sulfide (FeS) was synthesized.
• A deep eutectic solvent approach was employed for catalyst preparation.
• An annealing process was utilized to form the hybrid structure.
• Electrochemical N2 reduction reactions were conducted to evaluate catalytic activity.

Main Results:

• The hybrid Fe2O3/FeS catalyst demonstrated high efficiency for electrochemical N2 fixation.
• An ammonia (NH3) yield of 34.31 μg h-1 mgcat.-1 was achieved.
• A Faradaic efficiency of 18.06% for NH3 production was recorded at -0.25 V versus a reversible hydrogen electrode (RHE).

Conclusions:

• The designed hybrid Fe2O3/FeS catalyst is a promising electrocatalyst for sustainable ammonia (NH3) synthesis.
• The combination of crystalline Fe2O3 and amorphous FeS enhances catalytic activity.
• The deep eutectic solvent approach offers an effective route for fabricating advanced electrocatalysts.