Boosting Amino Acid Synthesis with WO_x Sub-Nanoclusters

Area of Science:

• Electrochemistry
• Catalysis
• Environmental Science

Background:

• Nitrate-rich wastewater poses environmental challenges.
• Converting waste into valuable products using renewable energy is crucial for sustainable cycles.
• Electrocatalytic methods offer a promising route for nitrogen and carbon cycle modulation.

Purpose of the Study:

• To develop novel electrocatalysts for nitrate reduction coupled with α-keto acids.
• To synthesize high-value amino acids from nitrate-rich wastewater.
• To investigate the role of sub-nanocluster catalysts in electrochemical synthesis.

Main Methods:

• Synthesis of WOₓ sub-nanoclusters supported on carbon materials.
• Electrocatalytic reduction of nitrate in acidic solutions.
• Coupling nitrate reduction with α-keto acids to form amino acids.
• In situ analysis and mechanistic studies.

Main Results:

• Optimized NH₃-NH₂OH selectivity (>80% Faradaic efficiency) by adjusting potential.
• Achieved remarkable activity and selectivity for C₂-C₆ amino acids using WOₓ/D-CB electrode.
• Obtained impressive Faradaic efficiencies for glycine (49.34%) and alanine (38.22%).
• Demonstrated that WOₓ sub-nanoclusters are more effective than larger WOₓ nanoclusters.

Conclusions:

• WOₓ sub-nanoclusters are efficient electrocatalysts for amino acid synthesis.
• Sub-nanocluster design is critical for reducing energy barriers in electrochemical synthesis.
• This work provides insights for designing cluster catalysts for sustainable amino acid production.