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Area of Science:

  • Electrochemistry
  • Organic Synthesis
  • Sustainable Chemistry

Background:

  • Electrosynthesis offers a sustainable pathway for amino acid production from readily available nitrogen sources and alpha-keto acids.
  • Understanding reaction mechanisms is crucial for improving efficiency and yield in amino acid electrosynthesis.

Purpose of the Study:

  • To investigate the overlooked role of electrolyte protons in amino acid electrosynthesis.
  • To elucidate how proton concentration influences the efficiency and selectivity of glycine synthesis.

Main Methods:

  • Utilized a model system of oxalic acid and nitrate coreduction to glycine on dendritic bismuth.
  • Analyzed the impact of varying proton concentrations on reaction intermediates and product formation.
  • Optimized reaction conditions based on mechanistic insights.

Main Results:

  • Optimal proton concentrations enhance two critical steps in glycine formation.
  • Protons facilitate the desorption of hydroxylamine intermediates, preventing ammonia formation and preserving key intermediates.
  • Proton concentration favors the hydrogenation of glyoxylic acid oxime, boosting glycine selectivity and production rates.
  • Achieved high glycine electrosynthesis performance with 78.9% Faradaic efficiency and 108.2 mA cm⁻² partial current density.
  • Demonstrated versatility by synthesizing other amino acids like alanine, aspartic acid, and phenylglycine with high efficiency.

Conclusions:

  • Proton concentration is a critical, yet often overlooked, factor in optimizing amino acid electrosynthesis.
  • Mechanistic understanding of proton effects allows for precise control over reaction pathways.
  • The developed approach provides a versatile and efficient method for sustainable amino acid production.