Issue 22, 2023

Conductive metal-covalent organic frameworks as novel catalytic platforms for reduction of nitrate to ammonia

Abstract

With their abundant metal sites, ordered porous structure and great conductivity, conductive metal–organic frameworks display many excellent single-atom electrocatalytic activities, superior to those of conventional inorganic nanostructures. However, their electrochemical application is greatly limited by the fragility of coordinated frameworks. Here, we describe a metal-covalent organic framework (MCOF) strategy to construct a nitrate reduction (NRA) catalyst using M3·HATN as the subgroup. Assisted by a salt-template, M-HATN-COFs with abundant metal sites (M at% ≈ 12.5%) are achieved by a one-step coordination–condensation approach. More importantly, the M-HATN-COFs provide reasonable platforms for studying the metal-atom catalytic mechanism, surpassing that of current inorganic structures. The Mo-HATN-COFs exhibit outstanding electrocatalytic properties with a high ammonia yield rate (8.52 mg h−1 cm−2), FE (91.3%) and stability for the NRA reaction. As the first work on MCOFs for electrochemical NRA reactions, the M-HATN-COF strategy will innovate the design concept of next-generation catalysts and the catalytic mechanism of single-metal atoms.

Graphical abstract: Conductive metal-covalent organic frameworks as novel catalytic platforms for reduction of nitrate to ammonia

Supplementary files

Article information

Article type
Paper
Submitted
02 iyn 2023
Accepted
05 okt 2023
First published
16 okt 2023

Green Chem., 2023,25, 9167-9174

Conductive metal-covalent organic frameworks as novel catalytic platforms for reduction of nitrate to ammonia

H. Huang and K. Wang, Green Chem., 2023, 25, 9167 DOI: 10.1039/D3GC01914D

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