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Robust bifunctionality in an oxygen electrode via core-shell heterostructure construction.

Yumei Feng1,2, Xianwei Li1,2, Zhiyong Ma3

  • 1State Key Laboratory of New Textile Materials & Advanced Processing Technology, College of Materials Science and Engineering, Wuhan Textile University, Wuhan 430200, China. cli@wtu.edu.cn.

Chemical Communications (Cambridge, England)
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Summary

A novel cobalt-selenium core-shell structure within nitrogen-doped carbon nanotubes significantly boosts zinc air battery performance and longevity. This breakthrough is attributed to optimized electronic structure and confinement effects for enhanced bifunctionality.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Zinc air batteries (ZABs) are promising for energy storage due to their high energy density.
  • Developing efficient and durable electrocatalysts is crucial for advancing ZAB technology.
  • Current ZAB catalysts often face challenges with activity and long-term stability.

Purpose of the Study:

  • To engineer a novel Co-CoSe core-shell heterostructure encapsulated in nitrogen-doped carbon nanotubes (NCNTs).
  • To investigate the electrocatalytic performance and stability of the developed material for ZAB applications.
  • To elucidate the underlying mechanisms responsible for the enhanced battery performance.

Main Methods:

  • Synthesis of Co-CoSe@NCNTs core-shell heterostructures.
  • Electrochemical characterization including cyclic voltammetry and galvanostatic charge-discharge cycling.
  • Analysis of material properties using techniques like X-ray diffraction and electron microscopy.

Main Results:

  • The Co-CoSe@NCNTs catalyst achieved a high power density of 172 mW cm⁻² in ZABs.
  • Exceptional long-term stability was demonstrated, with the battery operating for 970 hours.
  • The material exhibited superior bifunctional catalytic activity for both oxygen reduction and oxygen evolution reactions.

Conclusions:

  • The Co-CoSe@NCNTs core-shell heterostructure is a highly effective electrocatalyst for advanced zinc air batteries.
  • Modulation of the d-band center and confinement effects are key factors for the enhanced bifunctionality and stability.
  • This work offers a promising pathway for developing next-generation high-performance ZABs.