Two-Dimensional MOF Constructed by a Binuclear-Copper Motif for High-Performance Electrocatalytic NO Reduction to NH.

Ambient electrochemical NO reduction presents a dual solution for sustainable NO reduction and NH synthesis. However, their complex kinetics and energy demands necessitate high-performance electrocatalysts to ensure effective and selective process outcomes. Herein, we report that a two-dimensional Cu-based metal-organic framework (MOF), {[Cu(HL)]·HO} , (, HL = 5-(2'-carboxylphenoxy)isophthalic acid) acts as a stable electrocatalyst with high efficiency for NO-to-NH conversion. Electrochemical experimental studies showed that in 0.1 M KSO solution, the as-prepared achieved a peak Faradaic efficiency of 96.91% and a notable NH yield as high as 3415.82 μg h mg. The Zn-NO battery in aqueous solution can produce electricity possessing a power density of 2.04 mW cm while simultaneously achieving an NH yield of 616.92 μg h mg. Theoretical calculations revealed that the surface of effectively facilitates NO activation through a two-way charge transfer mechanism of "electron acceptance and donation", with the *NO formation step being the potential-determining stage. The study pioneers the use of a MOF as an electrocatalyst for ambient NO-to-NH conversion.