Synthesis And Electrochemical Properties Of 1D Managanese Oxides Nanomaterial

Transition-oxides have been the focus of good supercapacitor materials, manganese oxide, because of its low cost, various synthesis method, large potential window, theoretical good performance, and environmental friendly, has become most of researchers' target. In this paper,α-,β-,δ-,γ-MnO2 andγ-MnOOH were kept as study focus, by using XRD, SEM, TEM, CHI660, Autolab and other characterization methods, these nanomaterial above have been tested and analyzed. The main study work and results are as follows:By using hydrothermal method, based on KMnO4 and MnSO4 reaction system,α-,β-,δ-,γ-types have been synthesized, possessing different morphologies, such as 1D,2D structures. In this unique system, the controllable crystallography and morphology growth have been realized. In the alkaline environment,δ-type manganese oxide was obtained, which is in the form of 2D morphology; on the other hand at the acid environment,2×2α-,1×1β-,2×1γ-types were easy to form, just by adjusting the reaction temperature, reaction time, and the amount of additive PVP.α-type is 80 nm in diameter and 1μm in length nanowire;β-type consists of nanowires with 100 nm in diameter and 1μm in length; lastly,γ-type exists in the compound of nanowires and nanoparticles. Lastly, the mechanism for hydrothermal environment how to influence manganese oxide structure has been studied. Finally, CV analysis has been used to study the Current-Voltage of four types of MnO2. Based on condition of synthesizingα-type, we have studied the relationship between reaction time and its specific capacitance. At different reaction time 10 h and 18 h, the specific capacitance of examples are 41.3 F/g and 13.1 F/g, respectively.Also based on KMnO4 and MnSO4 reaction system, microemulsion and hydrothermal method have been combined to synthesisγ-MnOOH ultro-long nanowres clusters, in which surfactant PVP has been used as the soft module to direct the formation of nanowires.γ-MnOOH nanowires are 30 nm in diameter and 2-3μm in length, and at the same time, the effects and hydrothermal treatment, and different surfactants to the formation of crystals and their morphologies have been studied, and the mechanism has been studied; Through water solution self-assembly method, using CTAB as the soft module in the water-ethanol system, the amorphous manganese oxide has been synthesized intoγ-MnOOH 1-dimensional nanomaterial.γ-MnOOH nanowires are 200-600 nm in diameter and over 1μm in length. Different influential factors have also been studied, such as the reaction temperature, reaction time, the amount of addictive CTAB, and different water/ethanol percentage. Finally,γ-MnOOH nanowires have been tested by C-V and constant charging-discharging equipments. As a result, The specific capacitance is test as 25 F/g.