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Fe3C cluster-promoted single-atom Fe, N doped carbon for oxygen-reduction reaction

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Abstract

A key challenge in carrying out an efficient oxygen reduction reaction (ORR) is the design of a highly efficient electrocatalyst that must have fast kinetics, low cost and high stability for use in an energy-conversion device (e.g. metal–air batteries). Herein, we developed a platinum-free ORR electrocatalyst with a high surface area and pore volume via a molten salt method along with subsequent KOH activation. The activation treatment not only increases the surface area to 940.8 m2 g−1 by generating lots of pores, but also promotes the formation of uniform Fe3C nanoclusters within the atomic dispersed Fe–Nx carbon matrix in the final material (A-FeNC). A-FeNC displays excellent activity and long-term stability for the ORR in alkaline media, and shows a greater half-wave potential (0.85 V) and faster kinetics toward four-electron ORR as compared to those of 20 wt% Pt/C (0.83 V). As a cathode catalyst for the Zn–air battery, A-FeNC presents a peak power density of 102.2 mW cm−2, higher than that of the Pt/C constructed Zn–air battery (57.2 mW cm−2). The superior ORR catalytic performance of A-FeNC is ascribed to the increased exposure of active sites, active single-atom Fe–N–C centers, and enhancement by Fe3C nanoclusters.

Graphical abstract: Fe3C cluster-promoted single-atom Fe, N doped carbon for oxygen-reduction reaction

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Article information


Submitted
08 Jan 2020
Accepted
28 Feb 2020
First published
28 Feb 2020

Phys. Chem. Chem. Phys., 2020, Advance Article
Article type
Paper

Fe3C cluster-promoted single-atom Fe, N doped carbon for oxygen-reduction reaction

M. Lv, H. Guo, H. Shen, J. Wang, J. Wang, Y. Shimakawa and M. Yang, Phys. Chem. Chem. Phys., 2020, Advance Article , DOI: 10.1039/D0CP00109K

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