Robust and Flexible Aramid Nanofiber/Graphene Layer-by-Layer Electrodes.

Area of Science:

• Materials Science
• Nanotechnology
• Electrochemistry

Background:

• Aramid nanofibers (ANFs), or nanoscale Kevlar fibers, offer high mechanical performance and unique nanostructures.
• Developing mechanically robust and flexible nanocomposites for energy applications is a key challenge.
• Integrating ANFs into electrode structures requires balancing mechanical and electrochemical properties.

Purpose of the Study:

• To develop mechanically flexible and robust supercapacitor electrodes using aramid nanofibers (ANFs) and graphene oxide (GO).
• To investigate the layer-by-layer (LbL) assembly of ANFs and GO for electrode fabrication.
• To evaluate the electrochemical and nanomechanical properties of the resulting ANF/GO electrodes.

Main Methods:

• Layer-by-layer (LbL) assembly was used to blend ANFs and graphene oxide (GO) sheets.
• Chemical reduction was performed on the assembled ANF/GO films.
• Electrochemical testing (capacitance) and nanomechanical testing (flexing, modulus) were conducted.
• Control experiments using only GO were performed for comparison.

Main Results:

• The ANF/GO electrodes exhibited an ANF-rich structure with ANFs acting as a matrix for reduced graphene oxide sheets.
• LbL deposition showed linear growth, resulting in a composition of 75 wt % ANFs and 25 wt % GO.
• High areal capacitance of 221 μF/cm² (78 F/cm³) was achieved after reduction.
• The ANF/GO electrodes demonstrated exceptional mechanical flexibility, with no defects after 1000 flexing cycles, unlike GO-only controls.

Conclusions:

• ANF/GO composite electrodes fabricated via LbL assembly offer a promising pathway for robust, flexible energy storage.
• The synergistic interaction between ANFs and reduced GO sheets enhances both mechanical integrity and electrochemical performance.
• These findings highlight the potential of ANF-based materials for next-generation flexible electronic devices and power applications.