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Study on the Electrochemical Character of MnO2 and Its Compound

Author: LiuJing
Tutor: QinXue
School: Tianjin University
Course: Inorganic Chemistry
Keywords: Supercapacitor manganese dioxide carbon nanotube Electrochemical performance
CLC: O614.711
Type: Master's thesis
Year: 2009
Downloads: 180
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Abstract


Supercapacitors are new energy storage components between batteries and electrostatic capacitors, they have excellent properties, such as higher power density compared with rechargeable batteries, larger specific capacitor compared with conventional capacitors, and broad operating temperature range and long cycle life. Supercapacitors have become a hotspot in research because of their wide potential application.Studies on supercapaitors main focus on the preparation of high performance electrode materials now. In this dissertation we studied several methods for the preparation of manganese dioxide electrode material for supercapacitor, and prepared compound materials of manganese dioxide and carbon nanotubes. The capacitive property of manganese dioxide materials were investigated using cyclic voltammetric（CV）, constant current charge/discharge and electrochemical impedance spectrometry（EIS）. X-ray diffraction （XRD）, scanning electron microscope（SEM） and transmission electron microscope （TEM） were used to analyze the structure of MnO2. The main results are as follows:Prepared MnO2 by hydrothermal method in different temperatures, and took （NH4）2S2O8 as oxidant and MnSO4 as reductant, The experimental results show that the product made in 90℃has the best capacitance, at the current density of 2mA·cm-2, the specific capacitance achieved 140F·g-1. At the same conditions, took KMnO4 as oxidant and MnSO4 as reductant, and synthesised MnO2, the results of XRD indicate that the sample isα-MnO2, and the experimental results show that the product made in 90℃also has the best capacitance, the specific capacitance is 108F·g-1.Took MnSO4 as raw materials and prepared MnO2 by electrolysis method, From the experimental results we can know that with the increase of concentration of H2SO4 and scan rate, the specific capacitance of MnO2 electrode increased. The maximum specific capacitance of the product is 502F·g-1 and it has good cycling performance.Composite compounds with carbon nanotubes of different diameter and manganese dioxide, the effert of the carbon nanotubes’diameter and the percentage of the carbon nanotubes on the specific capacitance of compounds were studied. The results show that after composite, the specific capacitance of manganese dioxide increased obviously, when the percentage of the carbon nanotubes achieved 40%, the best specific capacitance is 238F·g-1.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > The Ⅶ group metal elements and their compounds > The manganese Vice Family ( VII B group metal elements) > Manganese Mn
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