High-performance iron ion hybrid supercapacitor based on CoMoS₃/polyaniline electrodes

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Energy storage devices are crucial for grid stability and renewable energy integration.
• Fossil fuel reliance and environmental pollution necessitate advanced energy storage solutions.
• Supercapacitors offer high power density but often face limitations in energy density and cycle life.

Purpose of the Study:

• To develop a high-performance iron-ion hybrid supercapacitor (IIHS) for efficient energy storage.
• To engineer a novel cathode material combining CoMoS3 and PANI for improved electrochemical performance.
• To investigate the potential of IIHS for long-term, stable energy storage applications.

Main Methods:

• Fabrication of a nano-honeycomb structured CoMoS3-PANI composite cathode.
• Assembly of an alternating current (AC)-based supercapacitor device.
• Electrochemical characterization including galvanostatic charge-discharge cycles and cycling stability tests.
• Development of a flexible poly (vinyl alcohol) / carboxymethyl cellulose Fe2+ gel electrolyte.

Main Results:

• The IIHS achieved a high areal capacitance of 3065.2 mF cm⁻² at 1 mA cm⁻².
• The device demonstrated excellent cycling stability, retaining 88.19% capacitance after 10,000 cycles.
• The flexible IIHS maintained 84.28% capacity after 3000 cycles with a gel electrolyte.

Conclusions:

• The nano-honeycomb CoMoS3-PANI cathode significantly enhances Fe2+ ion transport and cycling stability.
• The developed iron-ion hybrid supercapacitor offers a cost-effective, long-lasting, and safe energy storage solution.
• This IIHS technology shows considerable promise for future energy storage applications.