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Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System

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Manipulating charge carrier interactions at solid electrolyte interfaces for enhanced micro-supercapacitor

Abhirami Sukumaran¹, Premkumar Jayaraman¹, Helen Annal Therese¹

¹Futuristic Energy Storage Technology Lab (FESTL), Department of Chemistry, SRM Institute of Science and Technology Kattankulathur Chennai 603203 India helena@srmist.edu.in.

|June 26, 2025

Summary

This study explores gel polymer electrolytes for micro-supercapacitors, detailing how ion separation at interfaces enhances electric double layer capacitance (EDLC) for better energy storage devices.

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Solid electrolyte interfaces are key for advanced energy devices.
Electric double layer capacitance (EDLC) relies on controlled ionic charge at interfaces.
Understanding ionic transport is crucial for micro-scale energy storage design.

Purpose of the Study:

To investigate gel polymer electrolytes (GPE) for micro-supercapacitors (MSCs).
To analyze ion separation and charge migration at electrode/electrolyte interfaces.
To correlate interface characteristics with device performance.

Main Methods:

Fabrication of stacked MSCs using nanostructured GPE (polyvinyl alcohol with LiClO4 and Li2SO4).
Electrochemical characterization of the devices.
Electromotive force measurements to study cation and anion separation.

Main Results:

Demonstrated the role of GPE in achieving EDLC at interfaces.
Confirmed ion separation and migration at electrode/electrolyte interfaces.
Provided insights into the electrochemical properties influenced by ion behavior.

Conclusions:

Ultrathin GPE films are effective for MSCs.
Controlling ionic charge separation is vital for optimizing EDLC.
The study offers a foundation for designing advanced micro-energy storage solutions.