Efficient Solar-Driven Nitrogen Fixation over Carbon-Tungstic-Acid Hybrids

Area of Science:

• Materials Science
• Catalysis
• Renewable Energy

Background:

• Ammonia synthesis under mild conditions is crucial for industrial applications.
• Photocatalytic nitrogen fixation offers a sustainable route but faces challenges with N≡N bond cleavage.
• Current methods lack efficiency for industrialization.

Purpose of the Study:

• To develop a hybrid material for co-optimizing N₂ activation and photoinduced protonation.
• To enhance photocatalytic ammonia synthesis efficiency under ambient conditions.
• To investigate the role of carbon modification in nitrogen reduction.

Main Methods:

• Fabrication of a carbon-tungstic-acid (WO₃·H₂O) hybrid material.
• Utilizing simulated sunlight for photocatalysis.
• Employing nitrogen temperature-programmed desorption to analyze N₂ adsorption.

Main Results:

• Achieved efficient ammonia evolution of 205 μmol·g⁻¹·h⁻¹.
• Demonstrated the critical role of carbon in enhancing N₂ adsorption.
• Confirmed the function of photoactive WO₃·H₂O in providing electrons and protons.

Conclusions:

• The carbon-tungstic-acid hybrid effectively enhances photocatalytic ammonia synthesis.
• Carbon modification is a versatile strategy for improving N₂ reduction over various photocatalysts.
• This work provides insights for designing materials for efficient solar energy utilization in ammonia production.