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 1423 F g⁻¹ at a current density of 1 A g⁻¹, excellent electrochemical stability (capacity retention of 81.8% from 1 A g⁻¹ to 10 A g⁻¹), and long-cycle stability (capacity retention of 63% over 5000 cycles). The excellent electrochemical performance should be due to the abundant active sites provided by rGO combined with proper loading of Bi₂O₃ nanoparticles.

.