Issue 48, 2022

A co-carbonization strategy for confining ultralow-loaded Fe/Mn dual sites in hierarchically porous N-doped carbon for synergistic CO2 electroreduction

Abstract

Recent studies have witnessed the great prospect of bi-atom catalysts (BACs) in realizing effective electrocatalytic CO2 reduction. However, the precisely controllable syntheses of BACs with outstanding properties remain a significant challenge. Herein, the first bi-atom Fe/Mn–N–C catalyst for CO2 reduction was successfully developed by the co-carbonization of Fe/Mn co-doped ZIF-8 (Fe/Mn@ZIF-8) and carbon black. This strategy enhances the conductivity and induces the confinement effect of carbon supports, which contributes to anchoring trace Fe/Mn dual sites on hierarchically porous N-doped carbon. The bimetallic Fe/Mn–N–C catalyst exhibits an excellent CO faradaic efficiency of 95.7% at a low overpotential of 370 mV vs. RHE. DFT results reveal that the coexistence of trace Mn sites can strengthen the catalytic capabilities of Fe active sites in bimetallic Fe/Mn–N–C. The synergistic effect of ultralow-loaded Fe/Mn dual sites is favorable for the adsorption and activation of CO2 as well as *CO desorption from Fe active sites, boosting the entire CO2-to-CO transformation. This work provides valuable insight into the rational design of BACs for efficient CO2 electroreduction.

Graphical abstract: A co-carbonization strategy for confining ultralow-loaded Fe/Mn dual sites in hierarchically porous N-doped carbon for synergistic CO2 electroreduction

Article information

Article type
Paper
Submitted
19 Aug 2022
Accepted
11 Oct 2022
First published
12 Oct 2022

J. Mater. Chem. A, 2022,10, 25463-25470

A co-carbonization strategy for confining ultralow-loaded Fe/Mn dual sites in hierarchically porous N-doped carbon for synergistic CO2 electroreduction

M. Wu, Q. Ruan, H. Jiang, L. Zhang, D. Wang and J. Zou, J. Mater. Chem. A, 2022, 10, 25463 DOI: 10.1039/D2TA06567C

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