Exceptional Electroreduction of Nitrate to Ammonia Promoted by Concerted Electron–Proton Transfer in Cu-Decorated MFI Zeolites

. Cu-Z(23) also exhibits an excellent activity at low concentrations of nitrate (e.g., 50 ppm) and a high catalytic stability of 50 h. Synchrotron X-ray powder diffraction, solid-state nuclear magnetic resonance spectroscopy, and modeling studies reveal the critical role of the proximate "Cu-BAS" pairs in facilitating the CEPT process. This approach uncovers the overlooked capability of "electrical insulating" zeolites as effective electrocatalysts to drive future sustainable chemical synthesis.