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Highly dispersed γ-Fe2O3 embedded in nitrogen doped carbon for the efficient oxygen reduction reaction

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Abstract

The development of non-precious metal electrocatalysts with both high activity and durability to replace costly Pt-based catalysts for the oxygen reduction reaction (ORR) is still a major challenge. Composites of metal-oxide(s) and nitrogen doped (N-doped) carbon have emerged as promising candidates for the ORR in energy conversion and metal–air batteries. Herein, we report a versatile and robust sacrificial template approach to synthesize highly dispersed γ-Fe2O3 embedded in porous N-doped carbon with a high surface area. The as-prepared Fe2O3@NC-800 possesses a pure phase of γ-Fe2O3 with a small size, which interacts synergistically with N-doped carbon to increase ORR activity and selectivity. Fe2O3@NC-800 performs better than the commercial 20 wt% Pt/C as well as most iron-based non-precious metal catalysts reported previously. The assembled zinc–air battery with Fe2O3@NC-800 as a cathode catalyst exhibits a maximum power density of 112 mW cm−2 along with good operation durability, which is superior to that of 20 wt% Pt/C (68 mW cm−2).

Graphical abstract: Highly dispersed γ-Fe2O3 embedded in nitrogen doped carbon for the efficient oxygen reduction reaction

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Publication details

The article was received on 17 Jun 2019, accepted on 31 Jul 2019 and first published on 01 Aug 2019


Article type: Paper
DOI: 10.1039/C9CY01188A
Catal. Sci. Technol., 2019, Advance Article

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    Highly dispersed γ-Fe2O3 embedded in nitrogen doped carbon for the efficient oxygen reduction reaction

    Z. Xiao, G. Shen, F. Hou, R. Zhang, Y. Li, G. Yuan, L. Pan, J. Zou, L. Wang, X. Zhang and G. Li, Catal. Sci. Technol., 2019, Advance Article , DOI: 10.1039/C9CY01188A

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