Graphdiyne-based metal atomic catalysts for synthesizing ammonia

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Developing efficient catalysts for nitrogen reduction to ammonia (NH3) at ambient conditions remains a significant challenge.
• Existing methods often suffer from low yields, poor selectivity, and harsh operating requirements.

Purpose of the Study:

• To synthesize and characterize a novel atomic catalyst for highly efficient electrocatalytic nitrogen reduction.
• To investigate the catalytic mechanism and optimize performance for ammonia synthesis.

Main Methods:

• Synthesis of palladium (Pd) atoms dispersed on graphdiyne (GDY) to create Pd-GDY atomic catalyst.
• Electrochemical testing to evaluate ammonia yield and selectivity.
• Density functional theory (DFT) calculations to elucidate the reaction mechanism.

Main Results:

• The Pd-GDY catalyst achieved an ultrahigh average NH3 yield of 4.45 ± 0.30 mgNH3 mgPd−1 h−1.
• Demonstrated 100% selectivity for ammonia production in neutral media.
• Exhibited excellent stability with no significant decrease in yield or Faradaic efficiency over time.

Conclusions:

• The Pd-GDY atomic catalyst presents a highly promising platform for efficient and selective ammonia synthesis.
• Optimized p-d coupling at the Pd-C active sites enhances electron transfer and promotes nitrogen reduction.
• This work paves the way for practical applications in ammonia production and nitrogen fixation.