Improvement of Energy Density in Supercapacitors Through the Modification of Laser-Induced Graphene Electrodes with Nanomaterials and Prussian blue.

Abstract

The invention describes asymmetric supercapacitor device consisting of two six-finger (1.5 mm x 11.0 mm) interdigitated polyimide-based laser-induced graphene electrodes, mounted on a polyethylene terephthalate substrate and interconnected with a polyvinyl alcohol / sulfuric acid gel electrolyte. The laser-induced graphene electrodes are post-modified with carbon black microparticles and Prussian blue inorganic redox dye. According to the present invention, the incorporation of carbon black microparticles and Prussian blue inorganic redox dye significantly enhances the electrochemical performance and energy density of the developed supercapacitor. This improvement also increases the device’s flexibility and versatility, making it highly applicable across various industrial sectors that require rapid energy storage and release, such as flexible electronic devices, smart textiles, and wearable sensors.