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Nano Research 2024, 17(5): 4108-4117 https://doi.org/10.1007/s12274-023-6331-5
Research Article | Issue | Published: 29 December 2023

Structure and defect dual-engineering of cobalt oxides for low-temperature Zn-air batteries

Show Author's Information Hang Lei1,  Zhuowen Huangfu2,  Liangjun Chen2,  Xuelin Yang1,  Zilong Wang2( ),  Wenjie Mai2
Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China
Keywords:
low temperature, electrocatalysts, oxygen vacancies, hollow spheres, Zn-air batteries
Topics:
Air batteries
Cite this article:
Lei H, Huangfu Z, Chen L, et al. Structure and defect dual-engineering of cobalt oxides for low-temperature Zn-air batteries. Nano Research, 2024, 17(5): 4108-4117. https://doi.org/10.1007/s12274-023-6331-5
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Abstract Full text Electronic supplementary material About this article

The exploration of bifunctional electrocatalysts with high catalytic activity and long-term durability for low-temperature Zn-air batteries (ZABs) is an ongoing challenge. Here, quintet-shelled hollow spheres, P-doped multi-layer Co3O4 (PM-Co3O4), with enriched oxygen vacancies are prepared by thermally induced mass relocation and a simple phosphating process. Various advanced characterizations reveal P anion-induced effects on internal electronic structure and local coordination environment. The finite element method elucidates that the complex multi-layer spherical nanostructure is conducive to the transport and diffusion of OH– and O2. Benefiting from its unique structural features and abundant oxygen vacancies, the well-designed PM-Co3O4 presents small reversible oxygen overpotential for catalyzing oxygen reduction/evolution reactions. Accordingly, the fabricated low-temperature ZABs based on PM-Co3O4 as air-cathode exhibit high power density (20.8 mW·cm–2) and long-term stability (over 600 cycles) at the ultra-low temperature of –40 °C, outperforming state-of-art Pt/C+IrO2-based ZABs. Furthermore, the dynamic evolution mechanism of cobalt oxide catalysts during ZAB operation is elucidated. This work provides a guideline to design efficient electrocatalysts with regulated electronic configurations and exquisite nano-/microstructures for ZABs under extreme working conditions.


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Electronic supplementary material
About this article

Structure and defect dual-engineering of cobalt oxides for low-temperature Zn-air batteries

Show Author's information Hang Lei1, Zhuowen Huangfu2, Liangjun Chen2, Xuelin Yang1, Zilong Wang2( ), Wenjie Mai2
Hubei Provincial Collaborative Innovation Center for New Energy Microgrid, College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443002, China
Siyuan Laboratory, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China

Abstract

The exploration of bifunctional electrocatalysts with high catalytic activity and long-term durability for low-temperature Zn-air batteries (ZABs) is an ongoing challenge. Here, quintet-shelled hollow spheres, P-doped multi-layer Co3O4 (PM-Co3O4), with enriched oxygen vacancies are prepared by thermally induced mass relocation and a simple phosphating process. Various advanced characterizations reveal P anion-induced effects on internal electronic structure and local coordination environment. The finite element method elucidates that the complex multi-layer spherical nanostructure is conducive to the transport and diffusion of OH– and O2. Benefiting from its unique structural features and abundant oxygen vacancies, the well-designed PM-Co3O4 presents small reversible oxygen overpotential for catalyzing oxygen reduction/evolution reactions. Accordingly, the fabricated low-temperature ZABs based on PM-Co3O4 as air-cathode exhibit high power density (20.8 mW·cm–2) and long-term stability (over 600 cycles) at the ultra-low temperature of –40 °C, outperforming state-of-art Pt/C+IrO2-based ZABs. Furthermore, the dynamic evolution mechanism of cobalt oxide catalysts during ZAB operation is elucidated. This work provides a guideline to design efficient electrocatalysts with regulated electronic configurations and exquisite nano-/microstructures for ZABs under extreme working conditions.

Keywords: low temperature, electrocatalysts, oxygen vacancies, hollow spheres, Zn-air batteries

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Acknowledgements

Publication history

Received: 21 September 2023
Revised: 30 October 2023
Accepted: 12 November 2023
Published: 29 December 2023
Issue date: May 2024

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© Tsinghua University Press 2023

Acknowledgements

Acknowledgements

This work was financially supported by the Natural Science Foundation of Guangdong Province (Nos. 2021A1515010504 and 2022A1515010049), the National Natural Science Foundation of China (Nos. 21706090, 52172202, and 51872124), the Major Technological Innovation Project of Hubei Science and Technology Department (No. 2019AAA164), the Natural Science Foundation of Guangzhou (No. 201904010049). The authors would like to thank Qian Liu from Shiyanjia Lab (www.shiyanjia.com) for his support of TEM measurement.

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