Authors: Zhang, Xiong; Chen, Yao; Yu, Peng; Ma, Yanwei

Source: Journal of Nanoscience and Nanotechnology, Volume 10, Number 11, November 2010 , pp. 7711-7714(4)

Publisher: American Scientific Publishers

Abstract:

In the present work, amorphous manganese oxide nanomaterials have been synthesized by a common hydrothermal method based on the redox reaction between MnO⁻⁴ and Fe²⁺ under an acidic condition. The synthesized MnO₂ samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and electrochemical studies. XRD results showed that amorphous manganese oxide phase was obtained. XPS quantitative analysis revealed that the atomic ratio of Mn to Fe was 3.5 in the MnO₂ samples. TEM images showed the porous structure of the samples. Electrochemical properties of the MnO₂ electrodes were studied using cyclic voltammetry and galvanostatic charge-discharge cycling in 1 M Na₂SO₄ aqueous electrolyte, which showed excellent pseudocapacitance properties. A specific capacitance of 192 Fg⁻¹ at a current density of 0.5 Ag⁻¹ was obtained at the potential window from −0.1 to 0.9 V (vs. SCE).

Keywords: AMORPHOUS MANGANESE OXIDE; POROUS STRUCTURE; REDOX REACTION; HYDROTHERMAL METHOD; ELECTROCHEMICAL SUPERCAPACITORS

Document Type: Research article

DOI: http://dx.doi.org/10.1166/jnn.2010.2796

Publication date: 2010-11-01

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