Volume 18, Issue 20 2108094
Research Article

Hierarchical Core–Shell Co2N/CoP Embedded in N, P-doped Carbon Nanotubes as Efficient Oxygen Reduction Reaction Catalysts for Zn-air Batteries

Chongchao Yao

Chongchao Yao

National Engineering Laboratory for VOCs Pollution Control Material and Technology, Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing, 101408 P. R. China

Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing, 101408 P. R. China

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Jiaxin Li

Jiaxin Li

National Engineering Laboratory for VOCs Pollution Control Material and Technology, Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing, 101408 P. R. China

Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing, 101408 P. R. China

Sino-Danish College, University of Chinese Academy of Sciences, Beijing, 100049 China

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Zhihao Zhang

Zhihao Zhang

Key laboratory of Environmental Nanotechnology and Health Effects, Research Center for Eco-Environmental Sciences, Beijing, 100085 P. R. China

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Chunli Gou

Chunli Gou

National Engineering Laboratory for VOCs Pollution Control Material and Technology, Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing, 101408 P. R. China

Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing, 101408 P. R. China

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Zhongshen Zhang

Zhongshen Zhang

National Engineering Laboratory for VOCs Pollution Control Material and Technology, Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing, 101408 P. R. China

Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing, 101408 P. R. China

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Gang Pan

Gang Pan

Integrated Water-Energy-Food Facility (iWEF), School of Animal, Rural and Environmental Sciences, Nottingham Trent University, Nottinghamshire, NG25 0QF UK

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Jing Zhang

Corresponding Author

Jing Zhang

National Engineering Laboratory for VOCs Pollution Control Material and Technology, Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing, 101408 P. R. China

Research Center for Environmental Material and Pollution Control Technology, University of Chinese Academy of Sciences, Beijing, 101408 P. R. China

E-mail: [email protected]

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First published: 18 April 2022
Citations: 26

Abstract

Projecting a cost-effective and highly efficient electrocatalyst for the oxygen reaction reduction (ORR) counts a great deal for Zn-air batteries. Herein, a hierarchical core–shell ORR catalyst (Co2N/CoP@PNCNTs) is developed by embedding cobalt phosphides and/or cobalt nitrides as the core into N, P-doped carbon nanotubes (PNCNTs) as the shell via one-step carbonization, nitridation, and phosphorization of pyrolyzing Co-MOF precursor. The globally N, P-doped structure of Co2N/CoP@PNCNTs demonstrates an outstanding electrocatalytic activity in the alkaline solution with the onset and half-wave potentials of 1.07 and 0.85 V respectively. Moreover, a Zn-air battery assembled from Co2N/CoP@PNCNTs as the air cathode delivers an open circuit potential of 1.49 V, a maximum power density of 151.1 mW cm−2 and a specific capacity of 823.8 mAh kg−1. It is reflected that Co2N/CoP@PNCNTs provides a long-term durability with a slight decline of 15 h in the chronoamperometry measurement and an excellent charge–discharge stability with negligible voltage decay for 150 h at 10 mA cm−2 in Zn-air batteries. The results reveal that Co2N/CoP@PNCNTs has superiority over most Co-Nx-C or CoxP@C catalysts reported so far. The excellent catalytic properties and stability of Co2N/CoP@PNCNTs derive from synergistic effects between Co2N/CoP and mesoporous N, P-doped carbon nanotubes.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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