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Related Experiment Video

Updated: Jul 31, 2025

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

Published on: June 9, 2023

Engineering Oxygen Vacancies on VO₂ Multilayered Structures for Efficient Zn²⁺ Storage.

Rui Si¹, Shangjun Yi¹, He Liu¹

¹School of Chemistry and Materials Science, Nanjing University of Information Science and Technology, 219 Ningliu Road, Jiangsu, Nanjing, 210044, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|May 1, 2023

Summary

Oxygen-defect vanadium dioxide (VO2) cathodes enhance aqueous zinc-ion batteries (ZIBs) by improving kinetics and stability. Optimized defects boost capacity and cycle life for advanced energy storage.

Keywords:

VO2 aqueous zinc ion battery energy conversion oxygen defects vanadium

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Last Updated: Jul 31, 2025

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

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Published on: September 14, 2017

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Published on: October 23, 2018

Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Vanadium dioxide (VO2) exhibits potential as a cathode for aqueous zinc-ion batteries (ZIBs) due to its structural properties and high theoretical capacity.
However, its practical application is limited by sluggish reaction kinetics and structural instability caused by strong Zn2+ interactions.

Purpose of the Study:

To investigate the effect of oxygen defect engineering on VO2 performance in aqueous ZIBs.
To optimize oxygen vacancy concentration for enhanced electrochemical properties.

Main Methods:

A facile one-step hydrothermal method was employed to synthesize oxygen-defect VO2 (Od-VO2) by adjusting ascorbic acid concentration.
The electrochemical performance of Od-VO2 as a cathode material was evaluated in aqueous ZIBs.

Main Results:

Oxygen vacancies were shown to provide additional active sites for Zn2+ storage and reduce the electrostatic barrier for Zn2+ transport.
An optimal oxygen vacancy concentration in Od-VO2 resulted in a high capacity of 380 mAhg-1 at 0.2 A g-1.
The optimized cathode demonstrated excellent cycle stability (92.6% retention after 2000 cycles at 3 A g-1) and high energy density (197 Wh kg-1 at 0.641 kW kg-1).

Conclusions:

Defect engineering, specifically introducing oxygen vacancies, is an effective strategy to overcome the limitations of VO2 in aqueous ZIBs.
The developed Od-VO2 cathode material offers a promising pathway towards high-performance and stable aqueous ZIBs.