In this article,the uniform cryptomelane-type manganese oxide with an octahedral molecular sieves
structure was prepared under mild hydrothermal condition;the efects of hydrothermal temperature on the mi-
cro-nanostructure and supercapacitance properties of manganese dioxide were studied in detail.The structures
were characterized by SEM,XRD and TEM;and the supercapacitive behaviors were investigated with cyclic
voltammetry,galvanostatic charge and discharge tests.The experiment results suggested that:the prepared
nanoparticles can be self-organized into dendritic nanostructures,and the nanocluster arays are composed of
nanonedles or tetragonal prism nanorods;with the increase of reaction temprature,the crystal morphology of
manganese oxide was gradualy improving,and was trasformed from nanonedles to tetragonal prism nanorods;
the capacitance of MnO2 electrode was a combined contribution of electrical double-layer capacitance and pseud-
ocapacitance,and the best specific capacitance value of MnO2 electrode was 603F/g coresponding to the
charge/discharge cur rent density of 5 mA/cm2 ;with the increase of reaction temperature ranging from 100-180