Strong and Robust Polyaniline-Based Supramolecular Hydrogels for Flexible Supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Polymer Science

Background:

• Flexible electronics require advanced energy storage solutions.
• Conductive hydrogels offer potential for high-performance supercapacitors.
• Existing materials often lack the required mechanical and electrochemical stability.

Purpose of the Study:

• To develop a novel conductive hydrogel with enhanced mechanical and electrochemical properties.
• To fabricate high-performance flexible solid-state supercapacitors using the developed hydrogel.
• To evaluate the performance and durability of the supercapacitors.

Main Methods:

• Supramolecular assembly of polyaniline and polyvinyl alcohol via dynamic boronate bonds.
• Fabrication of polyaniline-polyvinyl alcohol hydrogel (PPH).
• Characterization of hydrogel properties and supercapacitor performance, including tensile strength, capacitance, energy density, and cycling stability.

Main Results:

• The PPH exhibited remarkable tensile strength (5.3 MPa) and electrochemical capacitance (928 F/g).
• The flexible solid-state supercapacitor demonstrated high capacitance (306 mF/cm², 153 F/g) and energy density (13.6 Wh/kg).
• The supercapacitor maintained 100% capacitance after 1000 folding cycles and 90% after 1000 charge-discharge cycles.

Conclusions:

• The supramolecular strategy successfully created a conductive hydrogel with excellent properties.
• The PPH-based supercapacitors show superior performance and robustness compared to existing flexible supercapacitors.
• This technology presents a promising power source for flexible electronic applications.