Dias, Cristiane de A.Santana, Henrique deNobre, Marcos Augusto Lima [UNESP]Lopes, Mauro C.2014-05-272014-05-272013-07-01Journal of Solid State Electrochemistry, v. 17, n. 7, p. 1967-1976, 2013.1432-8488http://hdl.handle.net/11449/75740A simple hybrid synthesis processing method was developed to synthesize γ-MnO2 nanocrystalline particles. The polyol method was modified by the addition of nitric acid in order to allow the synthesizing of single-phase Mn3O4 in a large scale. In the sequence, the acid digestion technique was used to transform Mn3O4 into γ-MnO2. Structural and morphological characterization was carried out by X-ray diffractometry, Infrared and Raman spectroscopy, thermogravimetric analysis, nitrogen adsorption isotherm, scanning electron microscopy, and transmission electron microscopy. The electrochemical properties were investigated by cyclic voltammetry and galvanostatic charge-discharge measurements. The synthesized material exhibits a specific capacitance of 125.1 F g-1 at a mass loading of 0.98 mg cm-2. The relation between structural features and electrochemical activity is discussed by comparing the synthesized material with commercial electrolytic manganese dioxide. © 2013 Springer-Verlag Berlin Heidelberg.1967-1976engDe Wolff disorderMicrotwinningPseudocapacitanceSupercapacitorsElectrolytic manganese dioxidesGalvanostatic charge dischargesInfrared and Raman spectroscopyMorphological characterizationSuper capacitorAlcoholsCyclic voltammetryManganeseManganese oxideScanning electron microscopyThermogravimetric analysisTransmission electron microscopyX ray diffraction analysisSynthesis (chemical)Artigo10.1007/s10008-013-2043-1WOS:000320888800021Acesso restrito2-s2.0-8487984534472019286007045300000-0003-4843-3975