【摘要】 用简易的室温或水热方法制备出不同形貌的MnCO3微结构。经600℃热处理后,室温制备MnCO3转变成Mn2O3胶体片,而水热制备MnCO3样品则形成多孔Mn2O3纳米结构。然而,室温制备MnCO3经120℃热处理后形成Mn2O3晶相。制备样品经过XRD和SEM表征表明,热处理MnCO3前驱物形成Mn2O3过程导致产物形貌与结构变化。其形成机理又通过TEM和FTIR进一步研究。Mn2O3纳米结构的电容性质通过循环伏安法表征,结果表明Mn2O3形貌与结构对其电容有重要影响。更多还原

【Abstract】 The MnCO3 with different structures was synthesized at room temperature or by hydrothermal method. The MnCO3 phase obtained at room temperature could be transferred to Mn2O3 plates by heat treatment at 600 ℃. In contrast, porous Mn2O3 nanostructures can be obtained after the heat treatment of MnCO3 precursors prepared by hydrothermal method. Interestingly, Mn2O3 phase can be also formed by heat treatment of the MnCO3 phase obtained at room temperature(Mn-RT) at 120 ℃. The products were characterized by means of XRD, SEM. The results clearly demonstrate a structure evolution from MnCO3 precursors to Mn2O3 structures on the completion of the reaction. The formation mechanism of the above materials was further investigated by TEM and FTIR. The capacitive properties of the Mn2O3 materials were characterized by cyclic voltammetry. The results show that the morphologies and structures of Mn2O3 samples play important roles on their capacitances.更多还原