Higher specific capacitance and compressibility nanocellulose based supercapacitor hydrogel electrode assembled by...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Developing high-performance supercapacitor electrodes is crucial for energy storage.
• Current methods often involve cumbersome polymerization onto nanocellulose and carbon materials.
• A simpler, more effective electrode preparation strategy is needed.

Purpose of the Study:

• To propose a simplified and effective method for preparing supercapacitor electrodes.
• To investigate the electrochemical and mechanical properties of the novel hydrogel electrode.
• To demonstrate the feasibility of this new approach for supercapacitor development.

Main Methods:

• Preparation of a hydrogel using TEMPO oxidized cellulose nanofibers (TOCNF) and multi-walled carbon nanotubes (MWCNT).
• Immersion of the hydrogel in aniline and FeCl3 solutions for 24 hours to form the electrode.
• Characterization of the electrode's area specific capacitance, maximum strain, and compressive stress.
• Assembly and testing of a symmetrical supercapacitor using the prepared hydrogel electrodes.

Main Results:

• The hydrogel electrode achieved an area specific capacitance of 1028 mF cm⁻² at 0.5 mA cm⁻².
• The electrode exhibited a maximum strain of 58% and a compressive stress of 150 KPa.
• The assembled symmetrical supercapacitor showed a high specific capacitance of 303 mF cm⁻² at 0.5 mA cm⁻².

Conclusions:

• The proposed method offers a simpler and more effective route for supercapacitor electrode fabrication.
• The TOCNF/MWCNT hydrogel-based electrodes demonstrate promising electrochemical and mechanical performance.
• This research presents a new feasible approach for developing advanced supercapacitors.