The relation between structural features and electrochemical activity of MnO2 nanoparticles synthesized from a polyol-made Mn 3O4 precursor
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Data
2013-07-01
Autores
Dias, Cristiane de A.
Santana, Henrique de
Nobre, Marcos Augusto Lima [UNESP]
Lopes, Mauro C.
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Resumo
A 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.
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Palavras-chave
De Wolff disorder, Microtwinning, Pseudocapacitance, Supercapacitors, Electrolytic manganese dioxides, Galvanostatic charge discharges, Infrared and Raman spectroscopy, Morphological characterization, Super capacitor, Alcohols, Cyclic voltammetry, Manganese, Manganese oxide, Scanning electron microscopy, Thermogravimetric analysis, Transmission electron microscopy, X ray diffraction analysis, Synthesis (chemical)
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Journal of Solid State Electrochemistry, v. 17, n. 7, p. 1967-1976, 2013.