Carbon Quantum Dots/Polyaniline Nanocomposite (S-CQD/PANI) for High Capacitive Asymmetric Supercapacitor Device

A sucrose derived carbon quantum dots/polyaniline (S-CQD/PANI) nanocomposite was synthesized as electrode materials by electrodeposition method to achieve excellent electrocapacitive performance for supercapacitor application. The morphology reveals that CQD were distributed uniformly over the surface of PANI. The highest specific capacitance obtained to be 1512.4 Fg^-1 at current density 1 Ag^-1 for S-CQD/PANI-25 composite in three electrode system with 1 M H₂SO₄ aqueous electrolyte within the potential range of -0.2 to 0.8 V. In addition asymmetric supercapacitor device was fabricated reveals highest specific capacitance of 295 Fg^-1 at 1 Ag^-1 with excellent stability over 1000 cycle at 3 Ag^-1. Remarkably, the device delivers energy density of 40.86 Whkg^-1 at power density 2000 Wkg^-1.