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Fine cutting edge shaped Bi2O3rods/reduced graphene oxide (RGO) composite for supercapacitor and visible-light photocatalytic applications

Maruthamani, D., Vadivel, S., Kumaravel, M., Saravanakumar, B., Paul, Bappi, Dhar, Siddhartha Sankar, Habibi-Yangjeh, Aziz, Manikandan, A., Ramadoss, Govindarajan
Journal of colloid and interface science 2017 v.498 pp. 449-459
X-ray diffraction, energy, photocatalysis, methylene blue, graphene oxide, nanocomposites, capacitance, scanning electron microscopy, synergism, transmission electron microscopy, graphene, irradiation
Bi2O3 rods/RGO composite has been synthesized by a simple precipitation and calcination method. The crystallnity, structural, and morphological features were studied by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and high resolution transmission electron microscopy (HR-TEM) techniques. The supercapacitor behavior was studied using cyclic voltammetry, galvanostatic charge discharge and impedance analysis, respectively. The Bi2O3 rods/RGO nanocomposite exhibits a maximum specific capacitance of 1041Fg⁻¹ at a current density of 2Ag⁻¹. The photocatalytic activity of Bi2O3 rods/RGO composite was evaluated by photocatalytic degradation of methylene blue (MB) dye under visible-light irradiation. The enhancement of photocatalytic properties of Bi2O3 rods/RGO composite attributed to the synergistic effect between Bi2O3 rods and graphene sheets which effectively prevents recombination of the photogenerated electron-hole pairs in Bi2O3 rods. The present study provides a new approach in improving the performance of Bi2O3 rods/RGO composite in energy and environmental applications.