Synergistic Ternary Heterostructures Cathode With "Electron-Complementation" Bridging Interfaces Enable...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Constructing multiphase heterostructures is key for advanced aqueous battery electrodes.
• Challenges include versatile synthesis and understanding heterointerfaces.
• Traditional methods have limitations in specificity and substrate dependency.

Purpose of the Study:

• To develop a versatile synthesis strategy for ternary all-component-active heterostructures.
• To engineer high-performance aqueous zinc batteries with improved electrode materials.
• To overcome limitations of traditional synthesis methods for battery electrodes.

Main Methods:

• Overpotential-driven synthesis strategy.
• Localized structure analysis and first-principles calculations.
• In situ synchrotron X-ray diffraction and ex situ X-ray absorption spectra.

Main Results:

• Precisely engineered V₂O₅@Cu₂S@Cu heterostructures with amorphous/crystalline bridging interfaces.
• Electronic complementarity facilitating deep charge transfer and superior kinetics.
• High reversible capacity (492 mAh g^-1) and long cycle life (9000 cycles at 5 A g^-1 with 90% retention).

Conclusions:

• The novel synthesis enables all-component redox activity and preferred rate capability in aqueous zinc batteries.
• The V₂O₅@Cu₂S@Cu heterostructure significantly surpasses single-component performance.
• This approach is extendable to other metal-based ternary heterostructures for high-performance cathodes.