Shape Control, Crystalline Conversion and Pseudocapacitance Properties of Mn₃O₄: Effects of Yb³⁺ Doping

【摘要】 We report a facile method for the synthesis of manganese oxide（Mn₃O₄） nanorods via the direct reaction of MnCl2 and H₂ O2 by doping Yb³⁺ ions at room temperature and air atmosphere. The Mn₃O₄:Yb³⁺ samples were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, cyclic voltammetry（CVs）, electrochemical impedance spectroscopy（EIS）, and charging-discharging test（CD）. The results show that trace Yb³⁺ doping（6 at%） could effectively induce crystalline transformation of Mn₃O₄ from cubic system（space group Fd-3 m） to tetragonal system（space group I41/amd） and incite the morphology changing from irregular particles to uniform nanorods. When Yb³⁺ doping amount is 3%, the capacitance of Mn₃O₄ reaches the maximum, 246 F/g, which is related to the morphology change and the corresponding decrease of impedance.更多还原

【Abstract】 We report a facile method for the synthesis of manganese oxide（Mn₃O₄） nanorods via the direct reaction of MnCl2 and H₂ O2 by doping Yb³⁺ ions at room temperature and air atmosphere. The Mn₃O₄:Yb³⁺ samples were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, cyclic voltammetry（CVs）, electrochemical impedance spectroscopy（EIS）, and charging-discharging test（CD）. The results show that trace Yb³⁺ doping（6 at%） could effectively induce crystalline transformation of Mn₃O₄ from cubic system（space group Fd-3 m） to tetragonal system（space group I41/amd） and incite the morphology changing from irregular particles to uniform nanorods. When Yb³⁺ doping amount is 3%, the capacitance of Mn₃O₄ reaches the maximum, 246 F/g, which is related to the morphology change and the corresponding decrease of impedance.更多还原