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Fabrication of MnO2 Hollow Microsphere and Its Application

Author: Sun
Tutor: PengQiao
School: Dalian University of Technology
Course: Chemical Engineering
Keywords: Supercapacitor Manganese dioxide Hollow
CLC: TM53
Type: Master's thesis
Year: 2010
Downloads: 221
Quote: 1
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Abstract


Manganese dioxide supercapacitor electrode materials research focus, with good electrochemical performance , high energy density , low prices , friendly environment . The article with ammonium bicarbonate and sodium carbonate material precursor, and then having a hollow structure of the manganese dioxide microspheres prepared by two methods of using the thermal oxidation method and the water legitimate . The charge-discharge , cyclic voltammetry , AC impedance , XRD , EDX, SEM, BET technical study of various substances and preparation of manganese dioxide supercapacitor . Legitimate water causes the hollow precursor of manganese carbonate and potassium permanganate reaction generated only in the surface layer of manganese dioxide , the central part fails reaction manganese carbonate with dilute hydrochloric acid to remove the hollow structure . The thermal oxidation method hollow making manganese carbonate causes thermal oxidation into a manganese dioxide and carbon dioxide gas , carbon dioxide is discharged from the internal generating channels only manganese dioxide to form a shell , hollow structure . Prepared by thermal oxidation process is simple, saving time , and the capacitance of the electrode materials prepared performance superior to water legally prepared . pH changes mainly affect the particle size of the microspheres , capacitor performance and impedance values ??. The impact of temperature on the thermal oxidation method , can produce different products, the better the higher the temperature of the product as manganese dioxide . Heating time of the thermal oxidation is increased performance over time changed for the better after the first deterioration . Prepared with ammonium bicarbonate precursor made ??of manganese dioxide material is lower than the capacitor , but the impedance is small ; manganese dioxide material of the precursor was prepared with sodium carbonate from high specific capacitance , but the impedance should be higher . But generally speaking, with sodium carbonate prepared from the electrode material is superior to the electrode material was prepared with ammonium bicarbonate . PH, time , temperature , the starting material , the molar ratio of research , found that the biggest , the best performance of the manganese dioxide microspheres preparation conditions of pH on the morphology and electrochemical properties of manganese dioxide prepared : pH 10.0 with sodium carbonate precursor was prepared , and then prepared by thermal oxidation to manganese dioxide microspheres in 0.5 mol / L Na2SO4 solution using 5 mA constant current charge and discharge testing its electrochemical performance of specific capacitance 267.10 F / g.

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CLC: > Industrial Technology > Electrotechnical > Electrical > Capacitor
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