High Performance Supercapacitors from Novel Metal-Doped Ceria-Decorated Aminated Graphene

Abstract

Herewith we are reporting a half-cell study of ceria electrode material made by uniform doping of silver and platinum nanoparticles for high performance supercapacitor applications. The hydrothermally synthesized electrode material had 5–7 nm size doped ceria particles decorated on a graphene sheet. The electrodes were prepared by dip coating. The measured specific capacitance for the neat Gr–CeO2 electrode was found to be 208 F g–1 at 1 A g–1 current density. Doping with silver and platinum, a large increase in specific capacitance was observed. Silver doping gave 1017 F g–1 specific capacitance at 1 A g–1 current density, a 5-fold increase, while platinum doping gave a 10-fold increase in specific capacitance, i.e., 1987 F g–1 at 1 A g–1 current density. The maximum energy and power density obtained were 41 kW kg–1 and 400 Wh kg–1, respectively, at 1 A g–1 current density for the Gr–CeO2–Pt electrode. The significant increase in specific capacitance was argued on the basis of enhancement in electrical c...