High-performance artificial nitrogen fixation at ambient conditions using a metal-free electrocatalyst

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Nitrogen (N2) conversion to ammonia is vital for life but challenging.
• Electrochemical reduction offers a sustainable alternative to the Haber-Bosch process for artificial nitrogen fixation.
• Efficient catalysts are crucial for overcoming nitrogen activation barriers in electrochemical N2 reduction.

Purpose of the Study:

• To develop a metal-free catalyst for efficient electrochemical nitrogen fixation.
• To investigate the performance of boron carbide nanosheets in ammonia synthesis.
• To elucidate the catalytic mechanism of nitrogen reduction reaction (NRR).

Main Methods:

• Electrochemical synthesis and characterization of boron carbide nanosheets.
• Ammonia yield and Faradaic efficiency measurements at ambient conditions.
• Density Functional Theory (DFT) calculations to study the catalytic mechanism.

Main Results:

• Boron carbide nanosheets demonstrated high performance as metal-free NRR electrocatalysts.
• Achieved an ammonia yield of 26.57 μg h⁻¹ mg⁻¹cat. and 15.95% Faradaic efficiency at -0.75 V vs RHE.
• Exhibited excellent electrochemical stability and selectivity for ammonia production.

Conclusions:

• Boron carbide nanosheets are promising catalysts for sustainable ammonia synthesis.
• This work advances metal-free electrocatalysts for artificial nitrogen fixation.
• The findings pave the way for energy-efficient ammonia production technologies.