Dynamic modulation of ionic and electronic pathways in flexible SnS₂-based interdigitated solid-state supercapacitors

Area of Science:

• Materials Science and Engineering
• Electrochemistry
• Energy Storage Devices

Background:

• Interdigitated supercapacitors (ISCs) offer efficient energy storage through optimized ion transport.
• Flexible electronics demand high-performance, compact energy storage solutions.

Purpose of the Study:

• To fabricate and characterize a symmetric flexible interdigitated supercapacitor (ISC) using SnS2 thin films.
• To investigate the pseudocapacitive behavior and transport properties of the ISC.
• To evaluate the ISC's potential for flexible energy storage applications.

Main Methods:

• Fabrication of a symmetric flexible ISC using electron beam evaporation and physical vapor deposition (PVD) of SnS2 thin films.
• Electrochemical characterization including cyclic voltammetry to determine volumetric capacitance.
• Analysis of ionic and electronic transport properties under various device states.

Main Results:

• The ISC exhibited significant pseudocapacitive behavior, achieving a high volumetric capacitance of 1129.1 F cm-3 at 5 mV s-1.
• Key transport properties were quantified, including ionic conductivity (σAC ≈ 6.788 × 10-4 S cm-1) and electron transfer characteristics.
• The device successfully powered red LEDs, demonstrating its energy delivery capability for flexible electronics.

Conclusions:

• The developed SnS2-based flexible ISC is a promising candidate for high-performance, compact energy storage.
• The study highlights the correlation between material properties and electrochemical performance in flexible supercapacitors.
• This research contributes to the advancement of integrated energy solutions for wearable and portable devices.