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Updated: Feb 17, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
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Selective Charging Behavior in an Ionic Mixture Electrolyte-Supercapacitor System for Higher Energy and Power
Xuehang Wang1,2, Aleksandar Yordanov Mehandzhiyski1, Bjørnar Arstad3
1Department of Chemical Engineering, Norwegian University of Science and Technology , 7491 Trondheim, Norway.
This study enhances supercapacitor (SC) performance by using a mixed ionic electrolyte. Different ion interactions enable simultaneous increases in power and energy densities for advanced SC systems.
Area of Science:
- Electrochemistry
- Materials Science
- Physical Chemistry
Background:
- Ion-ion interactions critically impact supercapacitor (SC) performance.
- Weakening these interactions boosts SC power but reduces energy density.
- Optimizing SCs requires balancing power and energy densities.
Purpose of the Study:
- To achieve simultaneous enhancement of power and energy densities in SCs.
- To investigate the effect of mixed ionic electrolytes with varying ionic interactions.
- To explore selective ion charging in confined porous structures.
Main Methods:
- Utilized an ionic mixture electrolyte with distinct cation interactions.
- Employed solid-state nuclear magnetic resonance (NMR) experiments.
- Performed theoretical validation using density functional theory (DFT) and molecular dynamics (MD) simulations.
Main Results:
- Demonstrated simultaneous enhancement of SC power and energy densities.
- Showcased selective ion packing: stronger interacting cations in mesopores, weaker in micropores.
- Confirmed that weaker interacting cations in micropores maintain power density.
Conclusions:
- Ionic mixture electrolytes paired with confined porous materials offer a novel approach for SC enhancement.
- Selective ion charging in different pore sizes is key to optimizing SC performance.
- This strategy provides a pathway for comprehensive improvements in supercapacitor systems.
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