Zn─F Diatomic Sites Promote Electrochemical C─N Coupling for the Synthesis of Amino Acids

ABSTRACT

While electrocatalytic C─N coupling offers a promising route for amino acid synthesis, its efficiency is limited by complex reaction pathways and competitive adsorption of reactants and intermediates on single‐site catalysts. Herein, we report a catalyst with F and Zn diatomic sites on MnO _2‐x that enables the efficient synthesis of various amino acids from keto acids and nitrate through electrocatalytic C─N coupling in neutral electrolytes. For alanine synthesis, this catalyst exhibits a high Faradaic efficiency (FE) of 76.25% and a production rate of 543.02 µmol cm ⁻² h ⁻¹ across a broad potential window from –0.3 to –1.3 V _RHE , while maintaining stable operation for over 300 h. In a membrane electrode assembly reactor, the catalyst sustains stable alanine production for 200 h with an average FE of 70.86%, enabling the practical isolation of 44.72 g of alanine. In situ spectroscopic and theoretical calculations demonstrate a tandem catalytic cascade, in which nitrate reduction proceeds to NH ₂ OH on MnO _2‐x , NH ₂ OH then spontaneously condenses with keto acids adsorbed on Zn sites to form C═N oxime intermediates, and these oximes migrate to F sites for hydrogenation to amino acids. This work offers insights into diatomic‐site design for amino acid electrosynthesis and promotes the sustainable production of high‐value organonitrogen compounds.