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Updated: Jan 13, 2026

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Engineering Hollow Cu2O@CuSe Core-Shell Structure: Enhancing Zn2+ Storage Kinetics for High-Performance Rocking-Chair

Bin Wang1, Siyuan Wang2, Peng Xie1

  • 1State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body College of Mechanical and Vehicle Engineering, Hunan University, Changsha, China.

Small (Weinheim an Der Bergstrasse, Germany)
|January 12, 2026
PubMed
Summary
This summary is machine-generated.

A novel hollow Cu2O@CuSe core-shell structure effectively suppresses zinc dendrites in aqueous zinc-ion batteries (AZIBs). This anode material demonstrates superior capacity, rate capability, and cycling stability for advanced energy storage.

Keywords:
core–shell structurein suit EISmetal selenidesrocking‐chair batterieszinc‐ion batteries

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Aqueous zinc-ion batteries (AZIBs) offer a safe and cost-effective alternative for energy storage.
  • Zinc anodes in AZIBs suffer from dendrite growth, low efficiency, and side reactions, limiting performance.
  • Developing stable and high-performance AZIB anodes is crucial for their commercialization.

Purpose of the Study:

  • To synthesize a novel core-shell anode material for AZIBs.
  • To investigate the electrochemical properties and stability of the synthesized material.
  • To demonstrate the potential of the new anode in a rocking-chair AZIB configuration.

Main Methods:

  • A facile and eco-friendly solution method was used to synthesize the hollow Cu2O@CuSe core-shell structure.
  • Electrochemical performance was evaluated using techniques like cyclic voltammetry and galvanostatic charge-discharge.
  • In situ electrochemical impedance spectroscopy (EIS), distribution of relaxation times (DRT) analysis, and density functional theory (DFT) calculations were employed for mechanistic studies.

Main Results:

  • The Cu2O@CuSe anode exhibited a high specific capacity of 430 mAh g−1 at 0.1 A g−1.
  • Excellent rate performance was achieved, with 248 mAh g−1 at 5.0 A g−1.
  • The material demonstrated remarkable cycling stability, retaining 74.4% capacity after 4000 cycles at 1.0 A g−1.
  • The CuSe shell enhanced interfacial redox activity and provided structural support for the Cu2O core.
  • A rocking-chair battery with Cu2O@CuSe anode and ZnMn2O4 cathode showed stable cycling, retaining 84% capacity after 20,000 cycles at 2.0 A g−1.

Conclusions:

  • The hollow Cu2O@CuSe core-shell structure is a promising anode material for high-performance AZIBs.
  • The unique structure effectively mitigates common issues associated with zinc anodes.
  • This work presents a viable strategy for developing advanced AZIBs with enhanced safety and longevity.