High-Performance Flexible All-Solid-State Supercapacitor from Large Free-Standing Graphene-PEDOT/PSS Films

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Wearable electronic devices require high-performance flexible energy storage solutions.
• Current flexible electrode materials often limit the performance of batteries and supercapacitors.

Purpose of the Study:

• To develop highly flexible, bendable, and conductive rGO-PEDOT/PSS films.
• To evaluate the electrochemical performance of these films as electrodes for supercapacitors.
• To demonstrate the practical applicability of the developed films in a flexible supercapacitor device.

Main Methods:

• Preparation of rGO-PEDOT/PSS films using a simple bar-coating method.
• Assembly of supercapacitor devices utilizing the rGO-PEDOT/PSS composite electrodes.
• Electrochemical performance testing, including cyclic voltammetry and galvanostatic charge-discharge cycles.
• Demonstration of device functionality by powering a green LED.

Main Results:

• Achieved highly flexible, bendable, and conductive rGO-PEDOT/PSS films.
• Demonstrated stable electrochemical performance of the assembled device even when bent and rolled.
• Obtained a high areal capacitance of 448 mF cm⁻² at a scan rate of 10 mV s⁻¹ with a high mass loading of 8.49 mg cm⁻².
• Successfully operated a roll-up supercapacitor device, powering a green LED for 20 seconds.

Conclusions:

• The developed rGO-PEDOT/PSS films are promising flexible electrode materials for high-performance supercapacitors.
• The simple bar-coating method offers a scalable approach for fabricating these advanced materials.
• The demonstrated roll-up supercapacitor highlights the potential for practical applications in flexible and wearable electronics.