Single boron modulated graphdiyne nanosheets for efficient electrochemical nitrogen fixation: a first-principles...

Area of Science:

• Materials Science
• Electrochemistry
• Catalysis

Background:

• Ammonia synthesis is crucial for agriculture and industry.
• Current methods often require high energy inputs.
• Developing efficient, mild-condition alternatives is essential.

Purpose of the Study:

• To design and investigate a metal-free electrocatalyst for nitrogen reduction reaction (NRR).
• To explore the use of single boron atom doped graphdiyne (GDY) for ammonia synthesis.
• To elucidate the NRR mechanism and catalytic activity using DFT.

Main Methods:

• Fabrication of single boron atom doped graphdiyne (GDY) monolayer.
• Density Functional Theory (DFT) calculations for mechanism elucidation.
• Electrochemical analysis of catalytic performance.

Main Results:

• The B(S3)@GDY configuration showed superior NRR catalytic activity.
• A low limiting potential of 0.27 V was achieved for the distal NRR pathway.
• Boron doping induced a small band gap (0.24 eV) and altered electron density, facilitating N2 activation.
• The competing hydrogen evolution reaction (HER) was suppressed.

Conclusions:

• Metal-free single-atom electrocatalysts based on GDY are effective for NRR.
• Boron doping in GDY enhances N2 fixation and ammonia production under mild conditions.
• This work presents a promising avenue for sustainable ammonia synthesis.