Facile synthesis of well-dispersed Bi2O3 nanoparticles and rGO as negative electrode for supercapacitor

Bi2O3 nanoparticles coupled with reduced graphene oxide (rGO) nanostructure were synthesized through liquid-phase precipitation and calcination method, and their supercapacitor properties were studied as negative electrode materials. The as-prepared Bi2O3/rGO achieved a maximum specific capacitance of 1423Fg(-1) at a current density of 1Ag(-1), excellent electrochemical stability (capacity retention of 81.8% from 1Ag(-1) to 10Ag(-1)), and long-cycle stability (capacity retention of 63% over 5000cycles). The excellent electrochemical performance should be due to the abundant active sites provided by rGO combined with proper loading of Bi2O3 nanoparticles.