Hydrothermal synthesis of Rose Bengal dye particle deposition on layered reduced graphene oxide composite for photo assisted supercapacitor applications

• The maximum absorbance of RB at 547 nm gives the PCE of DSSC is 0.34% that can refer to use as transport layer in solar cell. • Photo-induced RB-rGO causes Functionalization of oxygen groups chemical reaction. • Best C sp of 672 F/g at 3 A/g & retention of 82.5% over 4000 GCD cycles. • 38.88 Whr/kg and 4.988 kW/kg are highest ED & PD of RB-rGO electrode respectively. • Photo-super capacitor enhances C sp from GCD & CV shows instant storage of energy. Cutting-edge application of Photo-supercapacitor (PSC) in optoelectronics from photo-electrochemical storage electrode with energy conversion generating revolutionary shift to novel energy storage devices. The maximum absorbance of Rose Bengal (RB) at 547 nm gives the Power Conversion Efficiency (PCE) of Dye Sensitized Solar Cell (DSSC) is 0.34%. The fusion of RB with reduced Graphene Oxide (rGO) in aqueous and organic environment solubility provides functionalization of oxygen groups modifies surface wettability and mobility of Rose Bengal-reduced Graphene Oxide (RB-rGO) composite. It also provides structural transformation of amorphous RB into poly-crystalline RB-rGO composite and morphology studies confirm that large surface area of condensed layers of rGO grains incorporated with circular plates of RB provides maximum specific capacitance was 672 F/g and capacitance retention is 82.5% across 4000 Galvanostatic Charging and Discharging (GCD) cycles. The highest energy and power density are achieved by RB-rGO's Electric Double Layer Capacitance (EDLC) mechanism yields 38.88 Whr/kg and 4.988 kW/kg respectively. The PSC evident from self-charging capacitor improved specific capacitance of Galvanostatic charging and discharging (GCD) from 179 to 483 F/g and Cyclic Voltammetry (CV) from 285 to 503 F/g respectively under the influence of light that can enhances surface adsorption and charge transfer kinetics.