One-dimensional Manganese Oxide Material Molten Salt Preparation And Characterization

Manganese-based oxides nano powders have distinctive properties, which have been widely used as catalysts,ion-sieves, and especially as electrode materials in Li/MnO₂ batteries. In addition ,they can be applied in a magnetism material manufactures in electron field, used to make glass and ceramics in chemical industry .Recently, the wet chemical method for the preparation of nano metal oxide powders has attacted considerable interests and there are innumerous efforts about them. That can be summarized to solid-state reaction, gas-state reaction and wet chemical method, in which the wet chemical method includes phase transference method, precipitation, sol-gel technique, solvothermal and molten salt method etc. The molten salt method became attractive for its mild reaction conditions, easy regulation, and homogeneous particle size distribution of the prepared powders. This paper focuses on the molten salt synthesis and characterization of various manganese oxides powders, the results obtained in the experiments are intensively discussed.1. Molten salt synthesis of MnO₂ nanorodsThe effects of raw material and reaction time on MnO₂ powders are discussed. The mechanism of the MnO₂ nanorods formation is simply investigated. It is found that when the reaction occurs in KNO₃, the initial production is σ-MnO₂, which has a layer structure. With the reaction time prolonging to 20min ,the final production turns to a —MnO₂ nanorod. All these are consistent with the literature that is done by hydrothermal method . In addition,when the reation occurs in KNO₃ and LiNO₃, β-MnO₂ can be achieved only to ajust the appropriate atmosphere.2. Molten salt synthesis of Mn₂O₃ nanorodsThis experiment mainly focuses on the conditions for molten salt synthesis of Mn₂O₃ nanorods. The effects of raw material and reaction time on Mn₂O₃ nanorods are discussed. It is mostly investigate of the process of morphology with time. When the reaction occurs in NaNO₃, Mn₂O₃ nanorods are achieved with some subsequent processes. While the reaction occurs in NaNO₃ and LiCl, we can easily get Mn₂O₃...