CeO2 quantum dots doped Ni-Co hydroxide nanosheets for ultrahigh energy density asymmetric supercapacitors

摘要

By integrating the merits of lanthanide elements and quantum dots,we firstly design CeO2 quantum dots doped Ni-Co hydroxide nanosheet via a controllable synthetic strategy,which exhibits a large specific capacitance(1370.7 F/g at 1.0 A/g) and a good cyclic stability(90.6% retention after 4000 cycles).Moreover,we assemble an aqueous asymmetric supercapacitor with the obtained material,which has an extremely high energy density(108.9 Wh/kg at 378 W/kg) and outstanding cycle stability(retaining88.1% capacitance at 2.0 A/g after 4000 cycles).