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Updated: Jun 19, 2026
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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Piezoionic Interface Engineering Enabled High Energy Density and Suppressed Self-Discharge in Flexible
1Collaborative Innovation Center of Advanced Microstructures, School of Electronic Science and Engineering, Nanjing University, Nanjing, China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 17, 2026
Summary
Mechanical pressure enhances flexible supercapacitors by regulating ion transport. This piezoionic strategy boosts energy density and significantly slows self-discharge, improving performance for wearable electronics.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Self-discharge is a major limitation in flexible supercapacitors, particularly affecting energy storage and ion transport.
- Interface engineering is crucial for managing charge loss without compromising performance.
Purpose of the Study:
- To develop a piezoionic interface engineering strategy for flexible supercapacitors.
- To utilize mechanical pressure to actively regulate interfacial ion transport and charge relaxation.
Main Methods:
- A PVA-based hydrogel electrolyte with tunable piezoionic behavior was developed, guided by the Hofmeister effect.
- Mechanical pressure was applied to induce ionic polarization and modulate interfacial properties.
- Electrochemical performance, including energy density and self-discharge rate, was evaluated under varying pressure conditions.
Main Results:
- Compression enhanced interfacial conformality, driving ions into micropores and forming a more compact electric double layer, increasing capacitance.
- Induced polarization stabilized charge distribution, suppressed ion desorption, and slowed self-discharge.
- The flexible supercapacitor achieved 112.4 µWh cm-2 energy density and retained 90.1% energy after 1h, a 3.2-fold improvement over the unpressurized state.
Conclusions:
- A pressure-regulated interfacial design paradigm was established for flexible supercapacitors.
- This strategy simultaneously enhances energy density and charge retention.
- The developed supercapacitor successfully powered a wireless wearable insole system, demonstrating practical application potential.
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