High-Performance Biomass-Based Flexible Solid-State Supercapacitor Constructed of Pressure-Sensitive Lignin-Based and...

Area of Science:

• Materials Science
• Electrochemistry
• Sustainable Energy

Background:

• Flexible supercapacitors (FSCs) are crucial for wearable electronics.
• There is a growing need for sustainable, eco-friendly energy storage solutions.
• Utilizing renewable, earth-abundant materials like cellulose and lignin is key for green technology.

Purpose of the Study:

• To design and construct a novel biomass-based flexible supercapacitor (FSC) for the first time.
• To utilize chemically stable and flexible cellulose and electroactive lignin as primary materials.
• To evaluate the electrochemical performance and stability of the developed biomass-based FSC.

Main Methods:

• Assembled an FSC using lignosulfonate/single-walled carbon nanotube_HNO (Lig/SWCNT_HNO) pressure-sensitive hydrogels as electrodes.
• Employed cellulose hydrogels as an electrolyte separator.
• Tested electrochemical performance including specific capacitance, rate capability, energy density, and power density.

Main Results:

• Achieved a high specific capacitance of 292 F g^-1 at 0.5 A g^-1.
• Demonstrated an excellent energy density of 17.1 W h kg^-1 at a power density of 324 W kg^-1.
• Exhibited outstanding electrochemical stability with no degradation after 1000 bending cycles.

Conclusions:

• The developed biomass-based FSC shows remarkable flexibility, stability, and electrochemical performance.
• This sustainable FSC is a promising candidate for energy storage in wearable electronic devices.
• The study highlights the potential of using natural materials for green and sustainable energy solutions.