Volume 61, Issue 2 e202110838
Communication

Tailoring the Electronic Structure of an Atomically Dispersed Zinc Electrocatalyst: Coordination Environment Regulation for High Selectivity Oxygen Reduction

Yaling Jia

Yaling Jia

MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275 P. R. China

These authors contributed equally to this work.

Search for more papers by this author
Dr. Ziqian Xue

Dr. Ziqian Xue

Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, 606–8501 Japan

These authors contributed equally to this work.

Search for more papers by this author
Jun Yang

Jun Yang

MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275 P. R. China

Search for more papers by this author
Qinglin Liu

Qinglin Liu

MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275 P. R. China

Search for more papers by this author
Jiahui Xian

Jiahui Xian

MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275 P. R. China

Search for more papers by this author
Yicheng Zhong

Yicheng Zhong

MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275 P. R. China

Search for more papers by this author
Yamei Sun

Yamei Sun

MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275 P. R. China

Search for more papers by this author
Xiuxiu Zhang

Xiuxiu Zhang

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026 P. R. China

Search for more papers by this author
Prof. Qinghua Liu

Prof. Qinghua Liu

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230026 P. R. China

Search for more papers by this author
Prof. Daoxin Yao

Prof. Daoxin Yao

State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou, 510275 China

Search for more papers by this author
Prof. Guangqin Li

Corresponding Author

Prof. Guangqin Li

MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275 P. R. China

Search for more papers by this author
First published: 29 October 2021
Citations: 168

Graphical Abstract

A flexible alteration of an 2 e/4 e oxygen reduction reaction (ORR) pathway was discovered by tuning the coordination environment of Zn single sites derived from MOF-5 by varying the functional group of ligands within the metal–organic framework (MOF) precursors. The formed ZnN4 follows a 4 e ORR pathway, while ZnO3C achieves a maximum H2O2 production rate of 340 mmol g−1 h−1.

Abstract

Accurately regulating the selectivity of the oxygen reduction reaction (ORR) is crucial to renewable energy storage and utilization, but challenging. A flexible alteration of ORR pathways on atomically dispersed Zn sites towards high selectivity ORR can be achieved by tailoring the coordination environment of the catalytic centers. The atomically dispersed Zn catalysts with unique O- and C-coordination structure (ZnO3C) or N-coordination structure (ZnN4) can be prepared by varying the functional groups of corresponding MOF precursors. The coordination environment of as-prepared atomically dispersed Zn catalysts was confirmed by X-ray absorption fine structure (XAFs). Notably, the ZnN4 catalyst processes a 4 e ORR pathway to generate H2O. However, controllably tailoring the coordination environment of atomically dispersed Zn sites, ZnO3C catalyst processes a 2 e ORR pathway to generate H2O2 with a near zero overpotential and high selectivity in 0.1 M KOH. Calculations reveal that decreased electron density around Zn in ZnO3C lowers the d-band center of Zn, thus changing the intermediate adsorption and contributing to the high selectivity towards 2 e ORR.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.