A versatile transition metal ion-binding motif derived from covalent organic framework for efficient CO2 electroreduction

Publication Name

Applied Catalysis B: Environmental

Abstract

We demonstrate a versatile transition metal ion-binding motif for constructing highly efficient metal atom-embedded carbon catalysts for electrochemical CO production. It is a mesoporous N-doped carbon (N-C) derived from a covalent organic framework via molten-salt assisted carbonization. Three different transition metals (Co, Fe or Ni) have been immobilized into the N-rich mesopores via ion coordination, forming catalysts with isolated and coordinately unsaturated metal-N moieties. These catalysts all exhibit excellent electrocatalytic activities for CO -to-CO conversion with a high faradaic efficiency > 80 % and a high current density > 10 mA cm at modest overpotentials around 500 mV. Using Ni- or Fe-N-C, a highly selective (> 95 %) CO generation was observed. By performing the structure-property analysis with three other N-C materials as control, such high performance is ascribed to the efficient metal-N catalytic sites generated by the cooperative immobilization of metal atoms with pyridinic-N and pyrrolic-N species in the mesoporous carbon matrix. 2 −2

Open Access Status

This publication is not available as open access

Volume

291

Article Number

119915

Funding Number

CE140100012

Funding Sponsor

National Natural Science Foundation of China

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.apcatb.2021.119915