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Deciphering the Ion Storage Mechanism in Vanadium Pentoxide Pseudocapacitive Behavior at the Single-Particle Level
Yaqi Xiong1, Cong Gao1, Weitong Zhang1
1Key Lab of Sustainable Low-carbon Technologies for Textile Dyeing and Finishing, Ministry of Education, College of Chemistry and Chemical Engineering, Donghua University, Shanghai, 201620, China.
Small Methods
|November 26, 2025
Summary
Single-particle analysis of vanadium pentoxide (V2O5) reveals size-dependent pseudocapacitive behavior crucial for energy storage. Hollow V2O5 particles show reduced capacitive contribution compared to solid ones due to structural effects.
Area of Science:
- Electrochemistry
- Materials Science
- Nanotechnology
Background:
- Understanding ion storage mechanisms in electroactive materials is key for improving energy density.
- Pseudocapacitive behavior significantly influences the energy and power density of energy storage devices.
Purpose of the Study:
- To investigate the pseudocapacitive behavior of vanadium pentoxide (V2O5) at the single-particle level.
- To correlate structural features with pseudocapacitive performance in V2O5 particles.
- To elucidate the ion storage mechanisms in V2O5.
Main Methods:
- Scanning electrochemical cell microscopy (SECCM) was employed for simultaneous structural and electrochemical analysis of individual V2O5 particles.
- Cyclic voltammetry was performed at various scan rates to assess pseudocapacitive contributions.
- The influence of particle size and porosity on energy storage was examined.
Main Results:
- Pseudocapacitive behavior, including surface redox reactions and (de)intercalation, dominates the energy storage in V2O5.
- The capacitive contribution ratio increases with particle diameter, indicating size-dependent kinetics.
- Hollow V2O5 particles (550 nm diameter) exhibited a lower average capacitive contribution (82.5% at 0.5 V/s) than solid particles of similar size, attributed to restricted diffusion.
Conclusions:
- SECCM provides a powerful method for probing single-particle pseudocapacitive behavior.
- Particle structure, specifically porosity and size, significantly impacts ion storage mechanisms and pseudocapacitive performance in V2O5.
- These findings offer insights into optimizing V2O5 for advanced energy storage applications.
Keywords:
ion storagenanoelectrochemistrypseudocapacitorscanning electrochemical cell microscopysingle‐particlevanadium pentoxideMore Related Videos
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