Study on the electrochemical behavior of nanostructure S-doping manganese oxide as a novel supercapacitor material.

A nanostructure S-doping manganese oxide (MnO(x)S(y)) amorphous powder was prepared by a homogeneous coprecipitation method for supercapacitor application. The structure and surface morphology of the as-prepared MnO(x)S(y) powder were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), elemental analysis and X-ray photoelectron spectroscopy (XPS). The as-prepared nanostructure S-doping manganese oxide powder was confirmed with a chemical composition of MnO1.26S0.23 by elemental analysis, in which the average oxidation state of manganese is about 3.1. The supercapacitive behavior of the as-prepared MnO1.26S0.23 was studied by means of cyclic voltammetry (CV) and constant current charge-discharge cycling (CD) experiments in 1 mol L(-1) Na2SO4 electrolyte. A maximum specific capacitance of 181 F g(-1) was obtained for MnO1.26S0.23. Furthermore, the specific capacitance remained 97.3% of the original value after 500 cycles. The superior capacitive behavior and better cycling stability indicate that the amorphous nanostructure MnO(x)S(y) maybe a promising electrode material for electrochemical capacitors.