Layer-by-Layer Electrode Fabrication for Improved Performance of Porous Polyimide-Based Supercapacitors

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Nanoporous polymers offer high surface area for electrochemical applications but suffer from low electrical conductivity.
• Current methods like carbon hybridization limit the polymer's full capacity utilization.
• A new approach is needed to enhance conductivity without compromising polymer performance.

Purpose of the Study:

• To develop a novel layered electrode structure for supercapacitors.
• To improve the electrochemical performance of nanoporous polymer-based supercapacitors.
• To enable better utilization of porous organic polymers in energy storage devices.

Main Methods:

• Layer-by-layer fabrication technique separating active porous polymer and conductive carbon layers.
• Fabrication of supercapacitors using these novel layered electrodes.
• Extensive electrochemical characterization to evaluate device performance.

Main Results:

• The layered electrode design significantly enhances electrolyte-polymer contact and fast faradaic surface reactions.
• Achieved a specific gravimetric capacitance of 388 F·g^-1 and energy density of 65 Wh·kg^-1 at 0.4 A·g^-1.
• Demonstrated excellent cyclability with 90% capacitance retention after 5000 cycles at 1.6 A·g^-1.

Conclusions:

• The layered electrode structure effectively overcomes the conductivity limitations of nanoporous polymers.
• This design allows for superior utilization of the porous polymer's architecture for energy storage.
• The approach is promising for future supercapacitors, energy harvesting, and sensing devices.