LAUSR

Abstract In this study, flower-like Bi 2 O 2 CO 3 microsphere and Bi 2 O 2 CO 3 /RGO-(X) [X = 50, 75, and 100 mg of RGO] pseudocapacitor electrode materials have been successfully synthesized by a facile hydrothermal method. The pseudocapacitor electrodes were characterized by FE-SEM, HR-TEM, XRD, FT-IR, and TGA measurements. Electrochemical performance for pseudo capacitive properties of pure Bi 2 O 2 CO 3 and Bi 2 O 2 CO 3 /RGO-(X) composites has been further tested by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectroscopy. The results show that the Bi 2 O 2 CO 3 and Bi 2 O 2 CO 3 /RGO-(X) electrodes exhibited the specific capacitance value of 96, 260, 478, and 860 F g −1 , respectively, at a scan rate of 5 mV s −1 . Moreover, the cyclic performance for Bi 2 O 2 CO 3 /RGO-100 composite (96% capacity retention at 20 mV s −1 ) is superior to that of pure Bi 2 O 2 CO 3 (58% capacity retention at 20 mV s −1 ). Besides, the Bi 2 O 2 CO 3 /RGO-100 exhibited a high specific capacitance of 375 F g −1 at 0.2 A/g with enhanced rate capability (342.2 F g −1 at 5 A/g) and cyclic stability (84.5% retention after 1000 cycles at 5 A/g). Such a fabrication of hybrid nanocomposite electrode (Bi 2 O 2 CO 3 /RGO-100) may bring the development of excellent pseudocapacitor with superior electrochemical performance.