A Planar, Conjugated N4-Macrocyclic Cobalt Complex for Heterogeneous Electrocatalytic CO2 Reduction with High Activity

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Libo Sun
  • Zhenfeng Huang
  • Vikas Reddu
  • Tan Su
  • Adrian C. Fisher

Detail(s)

Original languageEnglish
Pages (from-to)17104-17109
Journal / PublicationAngewandte Chemie - International Edition
Volume59
Issue number39
Online published1 Jul 2020
Publication statusPublished - 21 Sept 2020
Externally publishedYes

Abstract

Metal complexes have been widely investigated as promising electrocatalysts for CO2 reduction. Most of the current research efforts focus mainly on ligands based on pyrrole subunits, and the reported activities are still far from satisfactory. A novel planar and conjugated N4-macrocyclic cobalt complex (Co(II)CPY) derived from phenanthroline subunits is prepared herein, and it delivers high activity for heterogeneous CO2 electrocatalysis to CO in aqueous media, and outperforms most of the metal complexes reported so far. At a molar loading of 5.93×10−8 mol cm−2, it exhibits a Faradaic efficiency of 96 % and a turnover frequency of 9.59 s−1 towards CO at −0.70 V vs. RHE. The unraveling of electronic structural features suggests that a synergistic effect between the ligand and cobalt in Co(II)CPY plays a critical role in boosting its activity. As a result, the free energy difference for the formation of *COOH is lower than that with cobalt porphyrin, thus leading to enhanced CO production. © 2020 Wiley-VCH GmbH

Research Area(s)

  • CO2 reduction, cobalt, electrocatalysis, heterogeneous catalysis, macrocycles

Citation Format(s)

A Planar, Conjugated N4-Macrocyclic Cobalt Complex for Heterogeneous Electrocatalytic CO2 Reduction with High Activity. / Sun, Libo; Huang, Zhenfeng; Reddu, Vikas et al.
In: Angewandte Chemie - International Edition, Vol. 59, No. 39, 21.09.2020, p. 17104-17109.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review