The Preparation And Structural Characterization Of Nano-manganese Oxides

Manganese oxides with a rather complex oxide system, forming several phases such as MnO, MnO₂, Mn₂O₃ and Mn₃O₄, are of considerable importance in many technological applications. Mn₂O₃ is known to be an active catalyst for removing carbon monoxide and nitrogen oxide from waste gas, MnO₂ and Mn₃O₄ for the oxidation of methane and carbon monoxide or the selective reduction of nitrobenzene. Mn₂O₃ and Mn₃O₄ have also been used to produce soft magnetic materials, such as manganese zinc ferrite. And in the last decade, considerable attention has been focused on lithiation of Mn-oxides for intercalation compounds of Li–Mn–O as electrode materials for rechargeable lithium batteries. In this paper, we study on the manganese oxides, two parts involved in my paper are as follows:Part One: Preparation and Characterization of Nano-manganese oxidesγ-MnOOH nanorods were directly prepared from reverse micelles of high CTAB concentration and MnO₂ nanorods, Mn₂O₃ nanoparticles, Mn₃O₄ nanorods were obtained by calcination in different temperatures and atmosphere. These morphologies were characterized by TEM, and the relationship between products and conditions of calcination were also investigated based on the TG and XRD analysis. The preparation conditions of nanorods and the formation mechanism of MnOOH were discussed in detail.Part Two: Study on the Structural Property of Nano-manganese oxidesThe Structural properties of MnOOH nanorods, MnO₂ nanorods, Mn₂O₃ nanoparticles and Mn₃O₄ nanorods were analyzed by Raman and XPS. The results showed that 2MnO·MnO₂ was in the external layers of Mn₃O₄ and Mn(+3)was present on the surface of MnOOH.