Volume 60, Issue 6 pp. 3212-3221
Research Article

Atomic-Level Modulation of Electronic Density at Cobalt Single-Atom Sites Derived from Metal–Organic Frameworks: Enhanced Oxygen Reduction Performance

Dr. Yuanjun Chen

Dr. Yuanjun Chen

Department of Chemistry, Tsinghua University, Beijing, 100084 China

These authors contributed equally to this work.

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Dr. Rui Gao

Dr. Rui Gao

College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021 China

These authors contributed equally to this work.

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Dr. Shufang Ji

Dr. Shufang Ji

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Haijing Li

Haijing Li

Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China

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Kun Tang

Kun Tang

School of Physics and Materials Science, Anhui University, Hefei, 230601 China

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Dr. Peng Jiang

Dr. Peng Jiang

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Prof. Haibo Hu

Prof. Haibo Hu

School of Physics and Materials Science, Anhui University, Hefei, 230601 China

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Zedong Zhang

Zedong Zhang

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Dr. Haigang Hao

Dr. Haigang Hao

College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, 010021 China

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Qingyun Qu

Qingyun Qu

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Xiao Liang

Xiao Liang

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Dr. Wenxing Chen

Dr. Wenxing Chen

Materials and Green Applications, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081 China

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Prof. Juncai Dong

Prof. Juncai Dong

Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049 China

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Prof. Dingsheng Wang

Corresponding Author

Prof. Dingsheng Wang

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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Prof. Yadong Li

Prof. Yadong Li

Department of Chemistry, Tsinghua University, Beijing, 100084 China

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First published: 30 October 2020
Citations: 573

Graphical Abstract

The correlation between atomic configuration induced electronic density of single-atom Co active sites and oxygen reduction reaction (ORR) performance has been established by combining density-functional theory calculations and electrochemical analysis. A metal–organic framework derived single-atom Co catalyst, comprising an optimal Co1-N3PS active moiety supported on hollow carbon polyhedron (Co1-N3PS/HC), was synthesized, and it exhibits superior alkaline and acidic ORR performance.

Abstract

Demonstrated here is the correlation between atomic configuration induced electronic density of single-atom Co active sites and oxygen reduction reaction (ORR) performance by combining density-functional theory (DFT) calculations and electrochemical analysis. Guided by DFT calculations, a MOF-derived Co single-atom catalyst with the optimal Co1-N3PS active moiety incorporated in a hollow carbon polyhedron (Co1-N3PS/HC) was designed and synthesized. Co1-N3PS/HC exhibits outstanding alkaline ORR activity with a half-wave potential of 0.920 V and superior ORR kinetics with record-level kinetic current density and an ultralow Tafel slope of 31 mV dec−1, exceeding that of Pt/C and almost all non-precious ORR electrocatalysts. In acidic media the ORR kinetics of Co1-N3PS/HC still surpasses that of Pt/C. This work offers atomic-level insight into the relationship between electronic density of the active site and catalytic properties, promoting rational design of efficient catalysts.

Conflict of interest

The authors declare no conflict of interest.

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