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Issue 12, 2018
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Synergistic effect of well-defined dual sites boosting the oxygen reduction reaction

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Abstract

Herein, we construct a novel electrocatalyst with Fe–Co dual sites embedded in N-doped carbon nanotubes ((Fe,Co)/CNT), which exhibits inimitable advantages towards the oxygen reduction reaction. The electrocatalyst shows state-of-the-art ORR performance with an admirable onset potential (Eonset, 1.15 V vs. 1.05 V) and half-wave potential (E1/2, 0.954 V vs. 0.842 V), outperforming those of the commercial Pt/C. The ORR test reveals that the performance of the (Fe,Co)/CNT is superior to most of the reported non-precious catalysts in alkaline electrolytes. Furthermore, when employed as a cathode catalyst in a Zn–air battery, the (Fe,Co)/CNT exhibits high voltages of 1.31 V and 1.23 V at discharge current densities of 20 mA cm−2 and 50 mA cm−2, respectively. In addition, the power density and the specific energy density reach 260 mW cm−2 and 870 W h kgZn−1. We discover that the Fe–Co dual sites embedded in N-doped porous carbon are beneficial for the activation of oxygen by weakening the O[double bond, length as m-dash]O bonds.

Graphical abstract: Synergistic effect of well-defined dual sites boosting the oxygen reduction reaction

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Publication details

The article was received on 10 Sep 2018, accepted on 14 Nov 2018 and first published on 15 Nov 2018


Article type: Communication
DOI: 10.1039/C8EE02656D
Citation: Energy Environ. Sci., 2018,11, 3375-3379
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    Synergistic effect of well-defined dual sites boosting the oxygen reduction reaction

    J. Wang, W. Liu, G. Luo, Z. Li, C. Zhao, H. Zhang, M. Zhu, Q. Xu, X. Wang, C. Zhao, Y. Qu, Z. Yang, T. Yao, Y. Li, Y. Lin, Y. Wu and Y. Li, Energy Environ. Sci., 2018, 11, 3375
    DOI: 10.1039/C8EE02656D

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