热处理对二氧化锰电化学行为的影响

doi:10.3866/PKU.WHXB20110431

Abstract

Abstract:

Manganese dioxide (MnO₂) was synthesized using a fluid phase method with potassium permanganate and manganous acetate as precursors. The obtained MnO₂ was treated thermally at different temperatures. The structural transformation of MnO₂, its electrochemical behavior as an electrode material for use in a supercapacitor were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), N2 physical adsorption, thermogravimetry (TG), cyclic voltammetry, and galvanostastic charge-discharge. The results indicate that the synthesized MnO₂ can be assigned to its α phase and that it possesses a mesoporous feature with a high surface area of up to 253 m²·g^-1. After a low temperature thermal treatment (<350 °C), the manganese oxide retained its α-MnO₂ crystal structure and its specific surface area was found to be approximately 170 m²·g^-1. The specific capacitance of the single electrode increased from 267 F·g^-1 for untreated MnO₂ to 286 F·g^-1 for the sample treated at 250 °C. However, high temperature thermal treatment (>450 °C) results in a transformation of the manganese oxide structure to α-Mn₂O₃ and then to α-Mn₃O₄. Additionally, the surface area reduced to ca 30 m²·g^-1 and this lead to a dramatic decrease in the specific capacitance of manganese oxide. The electrochemical cycling stability of manganese oxide improved noticeably after low temperature thermal treatment and the electrode retained a good rate performance at a scan rate of 50 mV·s^-1.

Key words: Manganese dioxide, Supercapacitor, Electrode material, Thermal treatment

MI Juan, WANG Yu-Ting, GAO Peng-Cheng, LI Wen-Cui. Effects of Thermal Treatment on the Electrochemical Behavior of Manganese Dioxide[J]. Acta Phys. -Chim. Sin. 2011, 27(04), 893-899. doi: 10.3866/PKU.WHXB20110431

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Effects of Thermal Treatment on the Electrochemical Behavior of Manganese Dioxide

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