Evaluation of charge storage ability of chrome doped Mn2O3 nanostructures derived by cathodic electrodeposition

Abstract A facile synthetic route has been proposed to prepare cauliflower-like nanostructures of Cr doped Mn 2 O 3 . The synthesis was carried out by constant current cathodic electrodeposition from Mn 2+ nitrate solutions containing minor amounts of dichromate. It was found that the presence of Cr mediates the formation of cathodic MnO 2 which then reacts with the excess Mn 2+ species to form Mn 2 O 3 nanostructures. X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Differential Thermal Analysis (DTA) were used to characterize the nanostructures. The storage ability of the obtained nanostructures was investigated by cyclic voltammetry (CV) in 0.5 M Na 2 SO 4 solution. The results indicated that the Cr doped manganese oxide material shows better performance than the non-doped one, and the charge capacity (SC) of doped manganese oxide (218 F/g) was higher than pure manganese oxide (208 F/g).