A direct-write method for preparing a bimetal sulfide/graphene composite as a free-standing electrode for...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Integrating 2D porous graphene with pseudocapacitive materials is challenging for energy storage.
• Microsupercapacitors (MSCs) require advanced electrode materials for high performance.

Purpose of the Study:

• To develop a simple technique for integrating Ni-Co-S pseudocapacitive materials with laser-induced graphene (LIG).
• To fabricate and evaluate the electrochemical performance of Ni-Co-S/LIG based MSCs.

Main Methods:

• Direct-laser-writing (DLW) technique to fabricate Ni-Co-S/LIG composite.
• Assembly of symmetric MSC devices using Ni-Co-S/LIG and active carbon (AC) electrodes.

Main Results:

• Achieved high areal specific capacitance of 680 mF cm-2 at 1 mA cm-2.
• Demonstrated high areal energy density of 56.9 μW h cm-2 at 800 μW cm-2.
• Exhibited excellent cycling stability, retaining 89.6% capacitance after 8000 cycles.

Conclusions:

• The synergistic effect between Ni-Co-S and LIG enhances electrochemical performance.
• DLW is an effective method for integrating pseudocapacitive materials with porous graphene.
• The developed Ni-Co-S/LIG materials show promise for high-energy-density MSCs.