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

Jing Wang; Wei Liu; Gan Luo; Zhijun Li; Chao Zhao; Haoran Zhang; Mengzhao Zhu; Qian Xu; Xiaoqian Wang; Changming Zhao; Yunteng Qu; Zhengkun Yang; Tao Yao; Yafei Li; Yue Lin; Yuen Wu; Yadong Li

doi:10.1039/C8EE02656D

Synergistic effect of well-defined dual sites boosting the oxygen reduction reaction†

Jing Wang,‡^a Wei Liu,‡^b Gan Luo,^c Zhijun Li,^a Chao Zhao,^a Haoran Zhang,^a Mengzhao Zhu,^a Qian Xu,^b Xiaoqian Wang,^a Changming Zhao,^a Yunteng Qu,^a Zhengkun Yang,^a Tao Yao,

^b Yafei Li,

^c Yue Lin,

*^d Yuen Wu

*^a and Yadong Li^e

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* Corresponding authors

^a Department of Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China, Hefei 230026, China
E-mail: yuenwu@ustc.edu.cn

^b National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China

^c Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, China

^d Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, China
E-mail: linyue@ustc.edu.cn

^e Department of Chemistry, Tsinghua University, Beijing 100084, China

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 (E_onset, 1.15 V vs. 1.05 V) and half-wave potential (E_1/2, 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 kg_Zn⁻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.

Energy & Environmental Science

Synergistic effect of well-defined dual sites boosting the oxygen reduction reaction†

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