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Constructing Nanoparticle-Integrated CoWO4 Microflakes as a Promising Cathode Material for Aqueous Zinc-Ion Batteries
Lin Huang1, Xin Wang2, Cuixia Cheng2
1College of Artificial Intelligence and Computer, Hubei Normal University, Huangshi 435002, Hubei, P. R. China.
Langmuir : the ACS Journal of Surfaces and Colloids
|November 28, 2025
Summary
Cobalt tungstate hierarchical microflakes show promise as cathode materials for aqueous zinc-ion batteries (AZIBs). This new material offers enhanced capacity, stability, and faster ion diffusion for improved energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Aqueous zinc-ion batteries (AZIBs) are crucial for sustainable energy storage.
- Developing efficient cathode materials is key to advancing AZIB technology.
- Cobalt tungstate (CoWO4) is explored as a potential cathode material.
Purpose of the Study:
- To synthesize and characterize cobalt tungstate (CoWO4) hierarchical microflakes.
- To evaluate the performance of CoWO4 as a cathode material in AZIBs.
- To investigate the impact of structural morphology on electrochemical properties.
Main Methods:
- Facile chemical precipitation-calcination strategy using hydrazine.
- Structural characterization through varying calcination temperatures (400-700 °C).
- Electrochemical performance testing in a CoWO4/Zn half-cell configuration.
Main Results:
- Hierarchical CoWO4 microflakes synthesized successfully.
- Optimized CoWO4 demonstrated high initial discharge capacity (177.6 mAh g-1).
- Exceptional cycling stability (92.9% retention after 1000 cycles) and rate capability (73.7 mAh g-1 at 2 A g-1) were achieved.
- Enhanced zinc-ion diffusion coefficient (9.85 × 10-13 cm2 s-1) observed.
Conclusions:
- Hierarchical CoWO4 microflakes offer superior performance in AZIBs compared to microrods.
- The enhanced surface area and ion transport pathways contribute to improved electrochemical properties.
- This work presents the first Zn/CoWO4 half-cell performance in aqueous electrolytes and a strategy for designing advanced energy storage materials.
