Co3(hexahydroxytriphenylene)2:A conductive metal-organic framework for ambient electrocatalytic N2 reduction to NH3

As a carbon-neutral alternative to the Haber-Bosch process,electrochemical N2 reduction enables environment-friendly NH3 synthesis at ambient conditions but needs active electrocatalysts for the N2 reduction reaction.Here,we report that conductive metal-organic framework CO3(hexahydroxytriphenylene)2(Co3 HHTP2)nanoparticles act as an efficient catalyst for ambient electrochemical N2-to-NH3 fixation.When tested in 0.5 M LiClO4,such Co3 HHTP2 achieves a large NH3 yield of 22.14μg·h^-1·mg^-1 cat.with a faradaic efficiency of 3.34%at-0.40 V versus the reversible hydrogen electrode.This catalyst also shows high electrochemical stability and excellent selectivity toward NH3 synthesis.