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Issue 22, 2021
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Establishing structure/property relationships in atomically dispersed Co–Fe dual site M–Nx catalysts on microporous carbon for the oxygen reduction reaction

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Abstract

Coupled metal–nitrogen–carbon (M–Nx–C) materials show great promise as platinum-group-metal (PGM) free catalysts for the oxygen reduction reaction (ORR). Herein, we report a facile strategy to construct atomically dispersed Co–Fe dual sites enriched on the surface of nitrogen doped microporous carbon (NC) as an efficient electrocatalyst for ORR. Synchrotron X-ray techniques indicate that the Co and Fe atoms are strongly correlated while further revealing that the longer-range lattice structure of NC is highly tunable. Density functional theory calculations reveal that the Co–Fe dimers are incorporated in the slightly disordered NC substrate, providing a lower adsorption free energy for O2. The as-prepared CoFe–NC catalyst exhibited excellent ORR activities, while a CoFe–NC based zinc–air battery exhibited a power density of 115 mW cm−2 and a specific capacity of 791 mA h g−1. This work showcases a straightforward methodology for creating atomically dispersed catalysts and illustrates the importance of understanding how dual metal sites impact electrocatalytic activity.

Graphical abstract: Establishing structure/property relationships in atomically dispersed Co–Fe dual site M–Nx catalysts on microporous carbon for the oxygen reduction reaction

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Article information


Submitted
08 Apr 2021
Accepted
10 May 2021
First published
10 May 2021

J. Mater. Chem. A, 2021,9, 13044-13055
Article type
Paper

Establishing structure/property relationships in atomically dispersed Co–Fe dual site M–Nx catalysts on microporous carbon for the oxygen reduction reaction

K. Wang, J. Liu, Z. Tang, L. Li, Z. Wang, M. Zubair, F. Ciucci, L. Thomsen, J. Wright and N. M. Bedford, J. Mater. Chem. A, 2021, 9, 13044
DOI: 10.1039/D1TA02925H

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