CeO2/Ce2O3 quantum dot decorated reduced graphene oxide nanohybrid as electrode for supercapacitor

Herein, we report a simple hydrothermal method to synthesize CeO2/Ce2O3 quantum dots anchored on reduced graphene oxide (RGO) sheets of different weight fractions for application as supercapacitor electrode. Of all the tested samples, one containing 7 wt% RGO (CRGO3) measured by thermogravimetry, exhibited highest specific capacitance 1027 F/g at 1 A/g along with good cycling stability. At current density 4 A/g, CRGO3 sample showed charge retention 79% after 5000 cycles, whereas 20 it 85% 3000 cycles. The values obtained electrode are better than previous ceria and based suggesting its potential use in supercapacitor. High resolution transmission electron microscopy (HRTEM) revealed well crystalline CeO2 nanoparticles (~5 nm) uniformly distributed few lattice planes indicative presence some Ce2O3 mixed CeO2. X-ray photoelectron spectroscopy (XPS) oxides mostly phase surface. enhanced performance was attributed optimized fraction large surface area electrically conducting combined electrocatalytic activity oxides.